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Every one of our 1080 free tools, grouped by category. All run in your browser, no sign-up.
Launch Toolkit
Category page →
README Generator
Fill in a short form and get a clean, structured README.md with badges, install, usage and license sections ready to copy. Private.
Meta Tags Generator
Enter your title, description and image to produce SEO, Open Graph and Twitter Card meta tags ready to paste into your page head. Private.
Break-Even Calculator
Enter fixed costs, price per unit and variable cost per unit to find the break-even units and the revenue needed to cover costs.
Business and Brand Name Generator
Enter a keyword and instantly get brandable company and product name ideas using prefixes, suffixes and blends. Copy any idea.
Slogan and Tagline Generator
Enter your brand or product and instantly get catchy tagline ideas to inspire your marketing, with one-click copy for any line.
Emoji Favicon Generator
Turn any emoji into favicon PNGs at 16, 32, 64 and 180 pixels and download them, with the HTML tag to use them.
Google SERP Snippet Preview
Type your title, URL and meta description to see a live desktop and mobile search result with pixel-width truncation.
UTM Campaign Link Builder
Add source, medium, campaign, term and content parameters to any URL and copy a clean, trackable campaign link for analytics.
Open Graph Tag Generator
Enter title, description, image and type to build valid og meta tags for rich link previews on Facebook, LinkedIn and Slack.
Dofollow Backlink Checker
Paste the page that links to you and your domain to see every link to your site and whether it is dofollow, nofollow, ugc or sponsored.
Social Media Link Preview Checker
See how your URL looks when shared on X (Twitter), LinkedIn, Facebook and Slack, and what is missing from your Open Graph and Twitter Card tags.
Website Launch Readiness Checker
One click checks HTTPS, title, meta description, social preview, favicon, mobile viewport, H1, indexing and speed, with a score and a fix for each problem.
Domain Name Availability Checker
Type a name and see at once whether it is registered on .com, .io, .ai, .app, .dev, .co and more, straight from the official registries.
AI Search Visibility Checker
See whether ChatGPT, Perplexity, Claude, Gemini and Bing crawlers are allowed to read your site, and what stops AI assistants from citing it.
Product Hunt Tagline Checker
Count characters against the 60-character limit, catch common mistakes and preview how your name and tagline read in the launch feed.
Product Hunt Maker Comment Generator
Fill in a few fields and get a ready-to-edit maker comment for launch day in three styles: the story, the short intro and the feature tour.
Product Hunt Launch Time Converter
Product Hunt days start at 12:01 AM Pacific Time; see exactly when that is in your time zone for the next seven days, with a countdown.
Privacy Policy Generator
Answer a few questions and get a plain-English privacy policy you can edit, copy and publish.
Terms of Service Generator
Answer a few questions and get plain-English terms and conditions you can edit and publish.
Product Launch Checklist
Thirty steps before, during and after launch day, with your progress saved in your browser.
OG Image Generator
Paste your website URL or type a title and get share images in 14 platform sizes, from link previews (1200 x 630) to YouTube thumbnails, Instagram stories and LinkedIn banners, with a live preview and the meta tags to paste.
SaaS Valuation Calculator
Estimate what a SaaS business is worth from its MRR or ARR and a revenue multiple, see a low to high range, and check the multiple behind any offer.
NPS Calculator
Enter how many promoters, passives and detractors you have, or paste raw 0 to 10 scores, and get your Net Promoter Score with the breakdown.
TAM SAM SOM Calculator
Estimate your total, serviceable and obtainable market bottom-up from the number of potential customers and your annual price.
LTV to CAC Ratio Calculator
Compare lifetime value against acquisition cost to judge if your unit economics are healthy, all in your browser.
Churn Rate Calculator
Enter customers lost and starting customers to get churn rate and retention rate percent instantly in your browser.
MRR and ARR Calculator
Turn subscribers and average price into monthly and annual recurring revenue instantly, all in your browser.
Burn Rate and Runway Calculator
Enter cash, monthly spend and income to find net burn and how many months of runway remain.
AI
Category page →
AI Text Summarizer
Paste an article, email or document and get a concise summary in seconds. No signup. Your text is processed by AI on the server.
AI Paraphraser
Reword and rewrite text to say the same thing differently while keeping the meaning. No signup. Text is processed by AI on the server.
AI Grammar Checker
Paste text and get a corrected version with grammar, spelling and punctuation cleaned up. No signup. Processed by AI on the server.
AI Translator
Translate text into Spanish, French, German, Chinese, Japanese and more. No signup. Your text is processed by AI on the server.
AI Headline Generator
Enter a topic and get several catchy headline and title options for articles, blogs and posts. No signup. Processed by AI on the server.
AI Explain Simply
Paste jargon or a hard concept and get a simple, clear explanation. No signup. Processed by AI on the server.
Text
Category page →
JSON Formatter & Validator
Beautify, minify and validate JSON instantly in your browser. No data leaves your device.
Word & Character Counter
Count words, characters, sentences, paragraphs and reading time as you type. 100% private.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more instantly.
Word Frequency Counter
Paste text and see which words appear most often, ranked by count, with optional stop-word filtering. Fully private.
Remove Duplicate Lines
Delete repeated lines, keep unique lines only, with optional case-insensitive and trim matching. Private.
Sort Lines
Sort text lines alphabetically or numerically, ascending or descending, with reverse and shuffle options. Runs privately in browser.
Reverse Text
Flip text backwards by characters, words or lines instantly. Create mirror-style strings and reversed messages, fully private.
Find and Replace
Replace all occurrences of a word or pattern in text, with case-insensitive and regex options. Bulk edit text privately.
Whitespace and Trim Remover
Trim leading and trailing spaces, collapse extra spaces, and strip blank lines from text in one click. Clean text privately.
Remove Line Breaks
Join broken lines into one paragraph or replace newlines with spaces or commas instantly. Runs in your browser.
Add Line Numbers
Number every line with custom start, separator and zero padding. Great for code, lists and logs. Fully private.
Text Repeater
Repeat any word, sentence or block of text as many times as you want, with a custom separator between copies. Runs privately.
Lorem Ipsum Generator
Create placeholder text by paragraphs, sentences or words for mockups and layouts, with a classic or random start. Private.
Slug Generator
Turn any title into a clean, lowercase, hyphenated slug for SEO-friendly URLs. Handles accents and symbols. Runs privately.
camelCase, snake_case and kebab Converter
Convert identifiers between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case for programming. Private.
Fancy Unicode Text Generator
Turn plain text into cursive, bold, italic, monospace, bubble and other Unicode styles for social media bios and posts. Private.
Upside-Down Text Generator
Flip your text so it reads inverted and reversed for fun social posts, usernames and messages. Copy and paste, private.
Zalgo and Glitch Text Generator
Add creepy, distorted combining marks to text at adjustable intensity for spooky posts and usernames. Copy and paste.
Bold Unicode Text Generator
Make bold, bold italic and sans-serif bold text that pastes into Instagram, LinkedIn and Twitter. Private.
Markdown to HTML Converter
Turn Markdown into clean HTML with a live preview. Supports headings, lists, links, bold, code and more. Runs privately.
Markdown Table Generator
Enter rows and columns, edit cells in a grid, and get clean aligned Markdown table syntax to paste into docs. Private.
Palindrome and Anagram Checker
Test if a word or phrase is a palindrome, and check whether two texts are anagrams of each other. Runs privately.
Text to ASCII Art Generator
Turn words into big figlet-style banner text made of characters for terminals, README files and comments. Private.
NATO Phonetic Alphabet Converter
Spell out any text as Alpha Bravo Charlie for clear communication over phone and radio. Reverse decode too. Private.
Text to Handwriting
Turn typed text into a handwritten-style note on lined paper and download it as a PNG image. Adjustable ink and size. Private.
Character and Special Symbol Picker
Browse and copy arrows, currency, math, stars, punctuation, emoji-style and other Unicode symbols with one click. Private.
Text to Binary
Turn any words into 8-bit binary code, with a space between each byte for readability. Encode messages privately in browser.
ROT13 Encoder and Decoder
Shift letters 13 places to hide or reveal text. ROT13 is its own inverse, so one button both encodes and decodes. Private.
Caesar Cipher
Encrypt or decrypt text by shifting letters a chosen number of places. Adjustable shift from 1 to 25 with instant preview. Private.
Morse Code Translator
Convert text to Morse code and Morse back to text, with support for letters, numbers and common punctuation. Runs in your browser.
Duplicate Word Remover
Delete repeated words from text and keep only the first occurrence of each, with optional case-insensitive matching. Private.
Text Statistics and Readability
Get word and sentence counts, average word length, reading time and a readability score for any passage. Fully private in browser.
Random Paragraph Generator
Produce readable random English paragraphs for testing layouts, writing prompts and placeholder content. Runs privately.
Title Case Converter
Capitalize headlines correctly by keeping minor words like a, an, the and of lowercase unless they start or end the title. Private.
Sentence Case Converter
Fix text that is in all caps or random casing by capitalizing the first letter of each sentence and lowercasing the rest. Private.
Strikethrough Text Generator
Add a line through your text using Unicode so it stays struck through when pasted into chats, bios and posts. Copy and paste.
Small Caps Text Generator
Turn lowercase letters into small capital Unicode characters for stylish bios, headings and posts. Copy and paste anywhere.
Line Counter
Count total lines, non-empty lines, blank lines and words in any text or code as you type. Live results, fully private in browser.
Remove Emojis from Text
Strip emoji, pictographs, symbols and hidden variation selectors instantly, leaving clean plain text. Runs in your browser.
Extract Email Addresses
Pull every email out of pasted content, dedupe and list one per line with a count. Fully private in your browser.
Extract URLs from Text
Pull every http and https link out of pasted content, dedupe and list one per line with a count. Private in your browser.
Extract Numbers from Text
Pull every number out of pasted content, list one per line, and see the total sum and count instantly. Runs in your browser.
Sentence Counter
Count sentences, words and characters in any text as you type, with live results. Fully private and processed in your browser.
Pig Latin Translator
Convert English text to Pig Latin instantly, moving leading consonants to the end and adding ay or way. Live and private in your browser.
Leetspeak Converter
Turn text into 1337 5p34k by swapping letters for numbers and symbols, or decode it back to plain text. Live and private in your browser.
Mirror Text Generator
Reverse the characters in your text to create mirrored, backwards strings, per line or all at once. Live and private in your browser.
Remove Extra Spaces
Collapse repeated spaces and tabs to a single space and trim each line for clean, tidy text. Runs in your browser.
Reverse Word Order
Flip a sentence back to front while keeping each word intact, per line or all at once. Private in your browser.
Developer
Category page →
Base64 Encode / Decode
Convert text to Base64 and decode Base64 back to text instantly in your browser. UTF-8 safe.
URL Encoder / Decoder
Percent-encode text for URLs or decode encoded URLs instantly. Handles query strings and special characters.
UUID Generator
Instantly generate random v4 UUIDs (GUIDs), one or in bulk. Cryptographically random, copy with one click.
Hash Generator (SHA-1 / SHA-256 / SHA-512)
Create SHA-1, SHA-256 and SHA-512 hashes from any text instantly in your browser using the Web Crypto API.
Unix Timestamp Converter
Convert epoch timestamps to human-readable dates and dates back to Unix time. Supports seconds and milliseconds.
JSON Minifier
Strip whitespace and newlines to compress JSON into the smallest valid payload for APIs, configs and bundles. Validates as it minifies.
JSON Validator
Check if your JSON is valid, get the exact error location on failure, and see a pretty-printed version when it parses cleanly.
JSON to CSV
Turn an array of JSON objects into a clean CSV file with headers, ready for Excel, Sheets or a database import.
CSV to JSON
Parse CSV with a header row into a clean array of JSON objects, handling quoted fields and embedded commas correctly.
JSON to YAML
Turn JSON config or API data into clean, readable YAML for Kubernetes, CI pipelines, Docker Compose and app config files.
YAML to JSON
Parse YAML config into clean JSON for APIs, tooling and validation. Handles nested maps, lists, comments and scalars.
XML Formatter
Pretty-print messy or minified XML with clean indentation so nested elements and attributes are easy to read.
YAML Formatter
Normalize indentation and re-serialize your YAML into clean two-space output by round-tripping it through a parser. Catches errors too.
HTML Formatter / Beautifier
Indent messy or minified HTML into clean, readable markup with proper nesting so you can scan structure at a glance.
CSS Formatter
Expand minified CSS into clean, indented rules with one declaration per line so stylesheets are easy to read and edit.
JS Formatter / Beautifier
Expand minified or one-line JS into readable, indented code with proper brace and block structure.
SQL Formatter
Turn long, cramped queries into clean, indented SQL with keywords on their own lines so complex statements are readable.
HTML Entity Encode / Decode
Convert characters like < > & " to safe HTML entities and back, so text renders literally instead of as markup.
Unicode Escape / Unescape
Convert text to backslash-u escape sequences and back, ideal for embedding non-ASCII characters in JSON and source code.
Hex to Text
Decode hexadecimal byte sequences into readable text and encode text back to hex. UTF-8 safe, handles spaces and 0x prefixes.
Binary to Text
Decode 8-bit binary into readable text and encode text back to binary. UTF-8 safe, tolerant of spaces between bytes.
JWT Decoder
Decode a JSON Web Token to inspect its header and payload claims instantly in your browser. Shows expiry in human-readable time.
Regex Tester
Test JavaScript regular expressions against sample text with live match highlighting, capture groups and flag toggles in your browser.
Cron Expression Parser
Paste a cron schedule to get a plain-English explanation and the next upcoming run times, all computed in your browser.
Cron Builder
Pick minute, hour, day, month and weekday from dropdowns to generate a valid crontab expression with a live plain-English preview.
Number Base Converter
Convert between binary, octal, decimal and hexadecimal instantly. Type in any base and see all four representations update live.
JSON Diff
Compare two JSON objects and see added, removed and changed keys with their old and new values, computed entirely in your browser.
Text Diff Checker
Compare two blocks of text line by line and see exactly which lines were added, removed or unchanged, computed in your browser.
gitignore Generator
Select your languages, frameworks and tools to build a solid .gitignore file with sensible defaults, ready to copy into your repo.
Chmod Calculator
Toggle read, write and execute permissions for owner, group and others to get the octal chmod number and symbolic notation instantly.
Subnet / CIDR Calculator
Enter an IP with a CIDR prefix to get the network address, broadcast, usable host range, subnet mask and total hosts.
HTTP Status Codes Reference
Search all standard HTTP response codes from 1xx to 5xx with their names and meanings. Filter instantly as you type.
MIME Types Reference
Search common file extensions and their content-type values for setting HTTP headers, uploads and downloads. Filter instantly.
ASCII Table Reference
Browse all 128 ASCII characters with their decimal, hexadecimal, octal and binary values plus names for control characters.
Color Hex to RGB
Convert hex color codes to rgb() and back, with a live swatch preview and support for shorthand hex.
CSS Minifier
Strip comments, whitespace and newlines to shrink stylesheets for faster page loads. Shows how many bytes you saved. Runs in your browser.
JavaScript Minifier
Remove comments and collapse whitespace to shrink JS for quick inline use. Preserves strings and reports bytes saved.
SQL Minifier
Collapse a multi-line SQL query into a single compact line by stripping comments and extra whitespace. Great for logs and embedding. Private.
JSON String Escape / Unescape
Escape text into a safe JSON string literal, or unescape a JSON string back to raw text. Handles quotes, newlines and unicode. Private.
String Length Calculator
Count characters, bytes in UTF-8, words and lines in any string, with and without spaces. Useful for limits and encoding. Private.
Placeholder Photo URL Builder
Configure width, height, grayscale, blur and a seed to generate ready-to-use random placeholder photo URLs for mockups. Private.
Base32 Encode / Decode
Convert text to standard RFC 4648 Base32 and decode it back. Handy for TOTP secrets, identifiers and case-insensitive tokens.
ROT47 Encoder and Decoder
Rotate printable ASCII by 47 positions to scramble text, including symbols and digits. Its own inverse, so one button does both.
Query String Parser
Paste a URL or query string and see every parameter and value in a clean table, with URL decoding and repeated keys handled. Private.
HTML Table Generator
Choose rows and columns, toggle a header row, and get clean, ready-to-paste HTML table markup with a live preview. Runs privately.
CSS Box Shadow Generator
Adjust offset, blur, spread, color and inset with live sliders and preview, then copy the ready-to-use box-shadow rule. Private.
Robots.txt Generator
Free robots.txt generator. Pick which crawlers to allow or block, add disallow paths, crawl delay and a sitemap URL, then copy a valid robots.txt file. Private.
UUID v7 Generator
Create time-ordered, sortable version-7 UUIDs in bulk. Great for database keys where insertion order and index locality matter. Private.
Slugify (URL Slug Generator)
Turn any title or phrase into a clean URL-safe slug: lowercase, accents stripped, spaces and symbols collapsed into hyphens. Runs privately.
HTML to Text
Strip tags and markup from HTML and get the clean plain text content, decoded and readable. All processing stays in your browser.
HMAC Generator
Compute a keyed HMAC over any message with SHA-256, SHA-384 or SHA-512 using the Web Crypto API. Hex output, computed in your browser.
.env to JSON
Free .env to JSON converter. Paste your dotenv KEY=VALUE lines and get a clean, pretty-printed JSON object. Comments and blank lines are ignored. Runs privately.
CSS px to rem / em Converter
Convert px to rem and em, or rem and em back to px, with an adjustable root font size. Instant results, computed in your browser.
JWT Generator (HS256)
Build and sign a JSON Web Token from your payload and a secret using HS256 via the Web Crypto API. Pairs with the JWT decoder. Runs privately.
UUID Validator
Paste a string to check whether it is a valid UUID and see which version (1 through 8) and variant it uses. Instant, private, in your browser.
String Case Converter
Turn any text into camelCase, snake_case, kebab-case, PascalCase or CONSTANT_CASE at once. Live, private, in your browser.
Calculators
Category page →
BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see your weight category instantly. Private, no sign-up.
Percentage Calculator
Work out what X% of Y is, what percent one number is of another, and percentage increase or decrease instantly.
Tip Calculator
Calculate the tip and split the bill between any number of people. Choose a tip percentage and see per-person totals instantly.
Loan / EMI Calculator
Calculate your monthly payment, total interest and total repayment for any loan amount, rate and term instantly.
Age Calculator
Find your exact age in years, months and days from your date of birth, plus total days, hours and your next birthday.
Mortgage Calculator
Estimate your monthly home loan payment, total interest and payoff over the full term in seconds.
Car / Auto Loan Calculator
Estimate your monthly auto payment from the vehicle price, down payment, trade-in, interest rate and loan term instantly.
Compound Interest Calculator
See how savings grow with regular contributions, compounding frequency, rate and time, plus interest earned instantly.
Simple Interest Calculator
Compute interest and final balance from principal, annual rate and time using the classic I = P x r x t formula.
Sales Tax Calculator
Add sales tax to a price or work backwards from a tax-inclusive total to find the net amount and the tax portion.
Discount / Sale Price Calculator
Enter an original price and a percent off to see the sale price and exactly how much money you save. Supports stacked discounts.
Investment / Savings Calculator
Project the future value of an initial deposit plus recurring contributions at a given annual return over time.
Retirement Calculator
Estimate your nest egg at retirement from your current savings, monthly contributions, expected return and years remaining.
ROI Calculator
Measure return on investment as a percentage and net profit from an initial cost and final value, with optional annualized ROI.
VAT Calculator
Add VAT to a net price or remove VAT from a gross price to find the net amount and the VAT portion at any rate you enter.
Markup / Margin Calculator
From cost and price get profit, markup percent and gross margin percent, and see how the two differ clearly.
Salary Calculator
Convert an hourly wage into weekly, monthly and annual pay, or go from a yearly salary back to an hourly rate instantly.
Debt Payoff Calculator
See how many months to clear a balance at a fixed monthly payment, the total interest paid and the true payoff time.
Percentage Change Calculator
Find the percent increase or decrease between two numbers and the absolute difference, with the direction shown.
Fraction Calculator
Add, subtract, multiply or divide two fractions and get the answer reduced to lowest terms plus a decimal value instantly.
Scientific Calculator
Evaluate expressions with trig, logarithms, exponents, square roots, pi and e, plus parentheses, all in your browser.
Ratio Calculator
Simplify a ratio to its lowest terms and solve proportions by finding the missing value in an equivalent ratio instantly.
Average / Mean Calculator
Enter a list of numbers to get the mean, median, mode, range, sum and count instantly, separated by commas or spaces.
Standard Deviation Calculator
Get population and sample standard deviation, variance, mean and count from a list of numbers, computed instantly.
Square Root Calculator
Find the square root of any number to high precision, plus the cube root, square and whether it is a perfect square.
GCD / LCM Calculator
Find the greatest common divisor and least common multiple of two or more integers using the Euclidean algorithm instantly.
Quadratic Equation Solver
Enter a, b and c to solve ax squared plus bx plus c equals zero, with real or complex roots and the discriminant.
Calorie / TDEE Calculator
Estimate your daily calorie needs from BMR and activity level, plus targets for cutting, maintaining or bulking.
BMR Calculator
Estimate your basal metabolic rate, the calories your body burns at complete rest, using the accurate Mifflin-St Jeor equation.
Body Fat Percentage Calculator
Estimate body fat percentage from simple tape measurements of neck, waist and hips instantly.
Ideal Weight Calculator
Estimate a healthy target weight from your height and sex using the Devine, Robinson and Hamwi formulas plus a BMI range.
Pregnancy Due Date Calculator
Estimate your due date from your last menstrual period using Naegele rule, plus current week and trimester.
Date Difference Calculator
Count the days, weeks, months and years between two dates, with or without including the end date, instantly.
Time Zone Converter
Convert a date and time from one time zone to another using your browser, with common cities and live daylight saving handling.
Countdown Timer to a Date
Count down to any future date and time and watch the days, hours, minutes and seconds tick down in real time in your browser.
GPA Calculator
Enter each course grade and its credit hours to compute your grade point average on the standard 4.0 scale, with total credits shown.
Final Grade Calculator
Find out exactly what score you need on your final exam to reach the overall course grade you are aiming for.
Weighted Grade Calculator
Combine assignments, quizzes and exams with their own weights to find your overall course grade, computed instantly.
Test Grade / Percentage Calculator
Enter the number of questions and how many were wrong or right to get your percentage score and letter grade instantly.
Cumulative GPA Calculator
Combine your previous GPA and total credits with this term to find your new overall cumulative grade point average.
Refinance Calculator
Compare your current loan payment against a new rate and term to see monthly savings, break-even point and lifetime interest.
APR Calculator
Include upfront fees in a loan to find the true annual percentage rate, so you can compare offers on an equal, honest basis.
401k Calculator
Project your retirement balance from your salary, contribution percent, employer match and expected return over the years to retirement.
Paycheck / Take-Home Pay Calculator
Estimate net pay per period after taxes and deductions using your own editable tax rate. No live tax lookup, fully private.
Overtime Pay Calculator
Work out your total pay from regular and overtime hours at any overtime multiplier such as time-and-a-half or double time.
Down Payment Calculator
Find your down payment amount and loan needed from a home price and percent down, or work backwards from savings you have.
Net Worth Calculator
Add up your assets and subtract your liabilities to see your total net worth, with a clear assets versus debts breakdown.
Rent vs Buy Calculator
Compare the total cost of renting against buying a home over a set number of years to see which comes out cheaper.
Credit Card Payoff Calculator
See how long a card takes to clear at a fixed payment, the interest cost, and how a bigger payment saves you money.
Water Intake Calculator
Estimate how much water to drink per day based on your body weight and exercise, shown in liters, ounces and cups.
Macro Calculator
Split your daily calories into grams of protein, carbs and fat for cutting, maintenance or bulking using your chosen ratio.
Running Pace Calculator
Enter any two of distance, time and pace and it solves the third, for miles or kilometers, with a finish time projection.
One Rep Max Calculator
Estimate your 1RM from a weight and reps using the Epley and Brzycki formulas, plus a full percentage training chart.
Calories Burned Calculator
Estimate calories burned during an activity from your body weight, duration and the activity MET value, computed instantly.
Gas / Fuel Cost Calculator
Estimate the fuel cost of a trip from distance, your vehicle fuel economy and the price you pay, plus cost per person.
Electricity Cost Calculator
Work out what an appliance costs to run per hour, day, month and year from its wattage, usage and your price per kWh.
Time Card Calculator
Add up daily clock-in and clock-out times minus breaks to get total hours worked for the week, plus estimated gross pay.
Debt-to-Income (DTI) Calculator
Enter your monthly debt payments and gross monthly income to get your DTI percent and a lender-style rating.
CAGR Calculator
Enter a start value, end value and number of years to get the compound annual growth rate as a clean percentage instantly.
Rule of 72 Calculator
Enter an annual return rate to estimate how many years it takes your money to double, or find the rate to double by a target.
Dividend Yield Calculator
Enter the annual dividend per share and share price to get the yield percent, plus optional shares for annual income.
Mortgage Payoff Calculator
See how many months to clear your balance with extra payments, the total interest, and interest saved versus no extra.
Car Affordability Calculator
Enter a monthly payment budget, loan rate, term and down payment to find the maximum car price you can afford.
Freelance Hourly Rate Calculator
Turn your target income, billable hours, expenses and tax rate into the hourly rate you need to charge to hit your goal.
Profit Margin Calculator
Enter your cost and selling price to get profit, gross margin percent and markup percent, with the difference made clear.
Savings Goal Calculator
Enter your target, current savings, monthly contribution and optional return to find how many months to reach your goal.
Emergency Fund Calculator
Enter your monthly essential expenses, months of coverage and current savings to get your target fund and remaining gap.
Random & Fun
Category page →
Password Generator
Create strong, random passwords with custom length, symbols, numbers and cases. Cryptographically random, private.
Dice Roller
Roll one or many dice (d4, d6, d8, d10, d12, d20 and more) with fair, random results for games and D&D.
Coin Flip
Flip a virtual coin for a fair heads or tails result. Great for quick decisions, games and settling disputes.
Random Number & Name Picker
Generate a random number in any range, or pick a random winner from a list of names. Fair, unbiased, and private.
Spinner Wheel
Add your own entries, hit spin, and watch the animated wheel land on a random winner. Perfect for raffles and picks.
Team Generator
Paste a list of names and split them into balanced teams instantly. Great for sports, classrooms, group projects and games.
Magic 8-Ball
Ask a yes or no question, shake the ball, and get one of the classic fortune-telling answers. A fun way to make a decision.
Yes or No Wheel
Spin for an instant random yes or no answer to settle any question. Simple, fair and fun for quick decisions and dares.
Rock Paper Scissors
Play rock paper scissors against the computer online. Pick your throw, see the random computer choice, and track your wins, losses and draws.
Truth or Dare
Get random truth questions and fun dares for parties and game nights. Clean, playful prompts for friends and groups.
Would You Rather
Get random, thought-provoking either-or questions for parties, road trips and icebreakers. Fun for groups of any size.
Random Name Picker
Paste a list of names and let the picker shuffle and land on one lucky winner. Great for giveaways, draws and classrooms.
Decision Maker
List your options and let it pick one at random to break analysis paralysis. Fast, fair and private for any tough choice.
Bingo Card Generator
Create a random 5x5 bingo card with a free center space, ready to print or play on screen. Classic B-I-N-G-O number layout.
DnD Dice Roller
Roll multiple dice with a modifier and see each result plus the total.
Random Country Picker
Get a random country from around the world with its flag. Great for travel inspiration, geography quizzes and trivia games.
Random US State Picker
Get a random American state with its capital and abbreviation. Handy for road trip ideas, geography quizzes and trivia.
Love Calculator
Enter two names for a playful match percentage. Just for laughs, not real science. A lighthearted crush test.
Zodiac Sign Calculator
Enter your birth date to find your astrological star sign, its element and date range. Quick, simple and private.
Dog Age Calculator
Convert your dog age into human years using a realistic size-based formula. Find out how old your pup really is in human terms.
Cat Age Calculator
Convert your cat age into human years with a realistic feline formula. Discover how old your cat really is in human terms.
Sleep Cycle Calculator
Find the best times to go to bed or wake up based on 90-minute sleep cycles so you wake up refreshed, not groggy.
Random Emoji Picker
Generate a random emoji or a batch of them with one click, then copy to your clipboard. Fun for messages, games and prompts.
Multiple Coin Flip
Flip many coins at once and see the full results plus heads and tails totals. Perfect for probability demos and experiments.
Random Letter Generator
Get one or more random letters of the alphabet, in upper or lower case. Great for word games, drills and quick challenges.
Random Date Generator
Pick a random calendar date between any two dates you set. Useful for testing, sampling, writing prompts and games.
Random Group Generator
Split a list of names into groups of a chosen size, shuffled fairly. Ideal for breakout rooms, pairs and study groups.
This or That
Get random either-or preference questions to spark conversation and get to know people. Fun for icebreakers and parties.
Random Passphrase Generator
Build memorable, strong passphrases from random common words, with adjustable word count and separators. Cryptographically random.
Random Color Palette Generator
Spin up a fresh set of harmonious colors with hex codes you can copy. Perfect for design inspiration and mood boards. Private.
Random Fact Generator
Tap for a surprising, bite-sized fact to spark curiosity or start a conversation. A fun grab bag of trivia from a curated list. Private.
Random Trivia Question
Get a quiz question, reveal the answer when ready, and test your general knowledge solo or with friends. Runs privately.
Never Have I Ever
Get random, party-friendly statements to play the classic game with friends. Clean and fun for groups of any size. Private.
Two Truths and a Lie Prompt
Get random themes and starter prompts to help you invent statements for this classic icebreaker game. Fun for groups. Private.
Random Scenario Generator
Get imaginative what-if situations for writing prompts, role play, improv and conversation. Sparks creativity instantly. Private.
Random Band Name Generator
Spin up quirky, memorable band names by combining random adjectives and nouns across genres. Great for musicians and fun. Private.
Random Recipe Idea Generator
Get a spontaneous meal concept combining a cooking style, protein and flavor to beat dinner indecision. Fun and private in browser.
Random Drawing Prompt Generator
Get a creative subject to sketch or paint, combining a character, action and setting to beat artist block. Fun and private.
Random Movie Picker
Add the films on your watchlist and let the tool choose one for you, ending the endless scroll and the what-should-we-watch debate. Private.
Converters
Category page →
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles instantly as you type.
Weight / Mass Converter
Convert between grams, kilograms, metric tonnes, ounces, pounds, and stones instantly with exact factors as you type.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly with correct offset formulas, updating live as you type a value.
Volume Converter
Convert between milliliters, liters, US and imperial gallons, quarts, pints, cups, and fluid ounces instantly as you type.
Area Converter
Convert between square meters, square feet, square kilometers, acres, hectares, square miles, and more instantly as you type.
Speed Converter
Convert between meters per second, km/h, mph, knots, and feet per second instantly with exact factors, updating live as you type.
Time Converter
Convert between seconds, minutes, hours, days, weeks, months, and years instantly with exact factors, updating live as you type.
Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB using decimal (1000) or binary (1024) units, live as you type.
Pressure Converter
Convert between pascals, kilopascals, bar, psi, atmospheres, mmHg, and torr instantly with exact factors, live as you type.
Energy Converter
Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU instantly as you type.
Power Converter
Convert between watts, kilowatts, megawatts, horsepower (metric and mechanical), and BTU per hour instantly as you type.
Fuel Economy Converter
Convert between miles per gallon (US and UK) and liters per 100 km using the correct reciprocal formula, live as you type.
Angle Converter
Convert between degrees, radians, gradians, arcminutes, arcseconds, and full turns instantly with exact factors, live as you type.
Cooking / Recipe Converter
Convert between cups, tablespoons, teaspoons, fluid ounces, and milliliters for recipes instantly as you type.
Shoe Size Converter
Convert US, UK, EU, and centimeter shoe sizes for men and women using standard sizing tables, updating live as you type.
Frequency Converter
Convert between hertz, kilohertz, megahertz, gigahertz, and RPM instantly with exact factors, updating live as you type.
CM to Inches Converter
Convert centimeters to inches instantly using the exact factor (1 inch = 2.54 cm). Live result as you type, no sign-up.
KG to LBS Converter
Convert kilograms to pounds instantly using the exact factor (1 kg = 2.2046226218 lb). Live result as you type, no sign-up.
Celsius to Fahrenheit Converter
Convert C to F instantly using the correct formula (F = C x 9/5 + 32). Live result as you type, no sign-up.
Feet to CM Converter
Convert feet to centimeters instantly using the exact factor (1 ft = 30.48 cm). Live result as you type, no sign-up.
Meters to Feet Converter
Convert meters to feet instantly using the exact factor (1 m = 3.280839895 ft). Live result as you type, private.
KM to Miles Converter
Convert kilometers to miles instantly using the exact factor (1 km = 0.6213711922 mi). Live result as you type, private.
ML to OZ Converter
Convert milliliters to US fluid ounces instantly (1 fl oz = 29.5735 mL). Live result as you type, no sign-up, private.
MM to Inches Converter
Convert millimeters to inches instantly using the exact factor (1 inch = 25.4 mm). Live result as you type, private.
Liters to Gallons Converter
Convert liters to US gallons instantly (1 US gallon = 3.785411784 L). Live result as you type, no sign-up, private.
Celsius to Kelvin Converter
Convert C to K instantly using the exact offset (K = C + 273.15). Live result as you type, no sign-up, private.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers instantly, both directions, live as you type.
Decimal to Binary Converter
Convert decimal numbers to binary instantly with input validation, updating live as you type. No sign-up, private.
Hex to Decimal Converter
Convert hexadecimal numbers to decimal instantly with input validation, updating live as you type. No sign-up, private.
KPH to MPH Converter
Convert kilometers per hour to miles per hour instantly (1 mph = 1.609344 km/h). Live result as you type, no sign-up.
Pounds to KG Converter
Convert pounds to kilograms instantly using the exact factor (1 lb = 0.45359237 kg). Live result as you type, no sign-up.
OZ to Grams Converter
Convert ounces to grams instantly using the exact factor (1 oz = 28.349523125 g). Live result as you type, no sign-up.
Cups to ML Converter
Convert US cups to milliliters instantly using the exact factor (1 cup = 236.5882365 mL). Live result as you type, private.
Tablespoons to ML Converter
Convert US tablespoons to milliliters instantly (1 tbsp = 14.7868 mL). Live result as you type, no sign-up, private.
Teaspoons to ML Converter
Convert US teaspoons to milliliters instantly (1 tsp = 4.9289 mL). Live result as you type, no sign-up, private.
Stone to LBS Converter
Convert stone to pounds instantly using the exact factor (1 stone = 14 lb). Live result as you type, no sign-up, private.
Stone to KG Converter
Convert stone to kilograms instantly using the exact factor (1 stone = 6.35029318 kg). Live result as you type, private.
Fluid Ounces to ML Converter
Convert US fluid ounces to milliliters instantly (1 fl oz = 29.5735 mL). Live result as you type, no sign-up, private.
MB to GB Converter
Convert megabytes to gigabytes instantly using decimal units (1 GB = 1000 MB). Live result as you type, no sign-up, private.
KB to MB Converter
Convert kilobytes to megabytes instantly using decimal units (1 MB = 1000 KB). Live result as you type, no sign-up, private.
GB to TB Converter
Convert gigabytes to terabytes instantly using decimal units (1 TB = 1000 GB). Live result as you type, no sign-up, private.
Bytes to KB Converter
Convert bytes to kilobytes instantly using decimal units (1 KB = 1000 bytes). Live result as you type, no sign-up, private.
Watts to Horsepower Converter
Convert watts to mechanical horsepower instantly (1 hp = 745.7 W). Live result as you type, no sign-up, private.
Bar to PSI Converter
Convert bar to pounds per square inch instantly (1 bar = 14.5038 psi). Live result as you type, no sign-up, private.
Pascal to PSI Converter
Convert pascals to pounds per square inch instantly (1 psi = 6894.76 Pa). Live result as you type, no sign-up, private.
Square Meters to Square Feet Converter
Convert m2 to ft2 instantly (1 m2 = 10.7639 ft2). Live result as you type, no sign-up, private.
Hectares to Acres Converter
Convert hectares to acres instantly (1 hectare = 2.47105 acres). Live result as you type, no sign-up, private.
Knots to MPH Converter
Convert knots to miles per hour instantly (1 knot = 1.15078 mph). Live result as you type, no sign-up, private.
Tons to Pounds Converter
Convert US short tons to pounds instantly using the exact factor (1 ton = 2000 lb). Live result in your browser as you type.
Ounces to Grams Converter
Convert ounces to grams instantly using the exact factor (1 oz = 28.349523125 g). Live result in your browser as you type.
Teaspoons to Tablespoons Converter
Convert tsp to tbsp instantly using the exact ratio (1 tbsp = 3 tsp). Live result in your browser as you type.
Gallons to Cups Converter
Convert US gallons to cups instantly using the exact ratio (1 gallon = 16 cups). Live result in your browser as you type.
Quarts to Liters Converter
Convert US quarts to liters instantly using the exact factor (1 quart = 0.946352946 L). Live result in your browser as you type.
Pints to Milliliters Converter
Convert US pints to mL instantly using the exact factor (1 pint = 473.176473 mL). Live result in your browser as you type.
Yards to Feet Converter
Convert yards to feet instantly using the exact ratio (1 yard = 3 feet). Live result in your browser as you type.
Miles to Feet Converter
Convert miles to feet instantly using the exact ratio (1 mile = 5280 feet). Live result in your browser as you type.
Bits to Bytes Converter
Convert bits to bytes instantly using the exact ratio (1 byte = 8 bits). Live result in your browser as you type.
Megabits to Megabytes Converter
Convert Mbps to MB per second instantly (8 bits = 1 byte). Live result in your browser as you type.
Degrees to Radians Converter
Convert degrees to radians instantly using the exact factor (pi/180). Live result in your browser as you type.
Celsius to Rankine Converter
Convert C to Rankine instantly using the correct formula (R = C x 1.8 + 491.67). Live result in your browser as you type.
Fahrenheit to Kelvin Converter
Convert F to K instantly using the correct formula (K = (F - 32) x 5/9 + 273.15). Live result in your browser as you type.
ATM to PSI Converter
Convert atmospheres to pounds per square inch instantly (1 atm = 14.6959 psi). Live result as you type, no sign-up.
Color
Category page →
Color Picker
Pick any color with the eyedropper wheel and instantly read its HEX, RGB and HSL values, then copy them with one click.
HEX to RGB Converter
Paste any hex color code and instantly get its red, green and blue values as an rgb() string ready for CSS.
RGB to HEX Converter
Enter red, green and blue values and instantly get the matching hex color code, ready to copy into CSS or design tools.
RGB to HSL Converter
Enter red, green and blue values and instantly get hue, saturation and lightness as a copyable CSS hsl() string.
HEX to HSL Converter
Paste a hex color code and instantly get hue, saturation and lightness as a copyable CSS hsl() string with a live swatch.
RGB to CMYK Converter
Enter red, green and blue values and instantly get cyan, magenta, yellow and key (black) percentages for print work.
HEX to RGBA Converter
Turn a hex color and an opacity slider into a copyable CSS rgba() string, with a live checkerboard transparency preview.
Color Palette Generator
Pick a base color and instantly build harmonious palettes (complementary, analogous, triadic) with copyable hex codes.
CSS Gradient Generator
Blend two colors, set the angle and type (linear or radial), preview live and copy the ready-to-paste background CSS.
WCAG Contrast Checker
Compare a text and background color, see the exact contrast ratio and whether it passes AA and AAA accessibility levels.
Color Shades and Tints Generator
Enter a base color and instantly get a full scale of darker shades and lighter tints with copyable hex codes.
Color Mixer and Blender
Pick two colors and a blend amount to see the mixed result in HEX and RGB, with a live swatch and one-click copy.
Named CSS Colors Chart
Browse and search all standard CSS color names with their hex codes and swatches, and copy any name or hex instantly.
Color Blindness Simulator
Enter a color to see how it appears under protanopia, deuteranopia and tritanopia to test your palette accessibility.
Random Color Generator
Generate a random color or a batch of them with one click, each shown as a swatch with copyable HEX and RGB values.
Generators
Category page →
QR Code Generator
Turn any URL or text into a real, scannable QR code entirely in your browser, then download it as a PNG. No sign-up, nothing uploaded.
Username Generator
Instantly create catchy, available-looking usernames by mixing adjectives, nouns and numbers for gaming, social media and sign-ups.
Random Name Generator
Generate realistic first and last names in bulk for characters, test data or placeholders, with one-click copy of the whole list.
Random Word Generator
Get one or many random English words for brainstorming, games, writing prompts and creative exercises, with copyable output.
Random Number Generator
Pick a min and max range and generate one number or a bulk list, with an option for unique values. Copy the results instantly.
Strong Passphrase Generator
Build memorable, high-entropy passphrases from random words with your choice of separator, capitalization and numbers.
PIN Generator
Instantly create random numeric PIN codes of any length (4, 6 or custom) using a secure random source, one or many at a time.
API Key Generator
Create random, high-entropy API keys and secret tokens with a custom prefix and length using the browser secure random source.
MAC Address Generator
Create random, valid-format MAC addresses with your choice of separator and case, one or many at a time, for testing and labs.
Fake Data Generator
Create dummy user profiles with names, emails, addresses and phone numbers for testing and mockups, exportable as text or JSON.
Credit Card Test Number Generator
Create fake numbers that pass the Luhn check for testing payment forms. For testing only, not real cards.
Hashtag Generator
Enter a topic or keywords and instantly get a set of relevant, ready-to-use hashtags for Instagram, TikTok and other social posts.
Random Quote Generator
Get an inspiring or thoughtful quote at the click of a button from a built-in local collection, ready to copy and share.
Excuse Generator
Get a random, lighthearted excuse for being late, skipping an event or missing a deadline. Pick a category and copy the result.
Pickup Line Generator
Get a random cheesy, punny or nerdy pickup line to break the ice or share a laugh. Pick a style and copy your favourite.
Random Emoji Generator
Get one or a batch of random emojis to spice up messages, usernames and posts. Click any emoji to copy it instantly.
Barcode Generator (Code 128)
Turn any text or number into a real, scannable Code 128 barcode in your browser and download it as a PNG image.
Color Hex Generator
Generate random hex color codes one at a time or in bulk, each shown with a live swatch and copyable with a single click.
Gift Idea Generator
Stuck on what to give? Pick a recipient and interest and get random gift suggestions to spark ideas, with one-click copy.
Random Password Generator (Advanced)
Build strong random passwords with fine control over length and character sets, plus a live strength meter.
Productivity
Category page →
Stopwatch
Start, stop and record splits with millisecond precision. No download, runs right in your browser.
Minute Timer
Set minutes and seconds, start the count and get an alarm when time is up. Simple, private, works with no install.
Pomodoro Timer
Focus for 25 minutes, then take a 5 minute break, on repeat. Track completed sessions and stay in flow, all in browser.
Online Notepad
Jot notes in your browser and they are saved locally as you type. No account, works offline, fully private.
To-Do List
Add tasks, check them off and delete when done. Saved in your browser automatically, no sign-up, works offline.
Tally Counter
Count anything with plus and minus buttons, run several counters at once and rename them. Saved in your browser.
Screen Resolution Checker
See your screen size, browser viewport, pixel ratio and color depth instantly. Live updates as you resize.
Typing Speed Test
Type the sample sentence and get your words per minute and accuracy instantly. Fun way to measure your typing skill.
Reaction Time Test
Click as soon as the box turns green and see your reaction time in milliseconds. Track your best over several tries.
Online Ruler
Measure small objects against your display. Includes a calibration slider so your DPI matches real size.
Aspect Ratio Calculator
Enter a width or height and get the matching dimension for any ratio like 16:9 or 4:3. Keep images in proportion.
Keyboard Tester
Press any key to see its name, key code and status light up. Check that every key on your keyboard works.
Webcam Test
See a live preview of your camera in the browser to check it works before a call. No recording, nothing uploaded.
Microphone Test
See a live level meter react to your voice to confirm your mic works. No recording, audio stays in your browser.
Emoji & Symbol Picker
Browse categories, search, and click any emoji or special character to copy it to your clipboard instantly.
Text to Speech
Type or paste text, pick a voice, and hear it read aloud. Adjust speed and pitch, nothing uploaded.
Team Shuffler
Paste a list of names and split them into a set number of teams or groups of a chosen size, fairly and instantly in browser.
Live Word Counter
Type or paste text and see words, characters, sentences, paragraphs and reading time update instantly as you write.
Break Reminder Timer
Set an interval and get a gentle on-screen and audio nudge to stand up, stretch and rest your eyes on repeat.
Meeting Cost Calculator
Enter number of people, average hourly rate and duration to see what a meeting really costs, ticking up live.
Online Signature Maker
Draw your signature with a mouse, finger or stylus and download it as a transparent PNG. Private, in your browser.
Online Drawing Board
Sketch with a pen and eraser, pick colors and sizes, then download your drawing as a PNG. No sign-up, no upload.
Image
Category page →
Image Resizer
Change an image to exact pixel dimensions or by percentage, lock the aspect ratio, and download the result. Private.
Image Cropper
Drag a crop box over your photo to keep only the part you want, then download the cropped image. Nothing uploaded.
Image Compressor
Re-encode JPG and PNG photos at a quality you choose to shrink file size, and see how much you saved. Private.
Image Format Converter
Change a picture between PNG, JPG and WebP right in your browser and download the converted file. Private.
Image to Base64
Turn a picture into a Base64 data URI you can paste into HTML or CSS. Copy the string, all done in your browser.
Rotate & Flip Image
Turn a photo left or right in 90 degree steps or mirror it horizontally and vertically, then download.
Add Text to Image
Set the words, size, color, opacity and position, then download the labeled picture.
Meme Generator
Upload any image, add classic bold top and bottom text, and download your meme. All in your browser, nothing uploaded.
Image Color Extractor
Upload a photo and get its dominant color palette with HEX codes you can click to copy. Runs in your browser.
Placeholder Image Generator
Create a dummy image at any size with custom colors and label text, then download it. No upload, no server.
Image to WebP Converter
Turn JPG or PNG photos into WebP at a quality you choose, compare file sizes, and download. All in your browser.
WebP to PNG Converter
Open a WebP image in your browser and save it as a standard PNG file in one click. Private, nothing is uploaded.
Grayscale Image Converter
Turn any photo black and white in your browser using true luminance values, then download the result. Private.
Pixelate Image
Turn a photo into chunky pixels with an adjustable block size, great for censoring or retro art. Runs in your browser.
Blur Image
Apply an adjustable blur to any photo in your browser and download the result. Useful for backgrounds and hiding detail.
Circle Crop Image
Cut a photo into a perfect circle with a transparent background and download it as a PNG. Ideal for profile pictures.
Add Border to Image
Pick the border color and thickness, preview it live, and download the framed photo. Runs in your browser.
SVG to PNG Converter
Rasterize an SVG file at 1x to 8x scale and download a crisp PNG. Runs fully in your browser, nothing is uploaded.
Image Color Picker
Upload a photo, click any pixel to get its HEX and RGB values, and copy them in one click. Works in your browser.
PDF
Category page →
Merge PDF
Combine several PDF files into one document, drag the files to reorder them, then download the merged PDF. Nothing uploaded.
Split PDF
Pull out a page range from a PDF into a new smaller document and download it, all done privately in your browser.
Compress PDF
Re-save a PDF to trim its file size in your browser and see the before and after numbers. Private, nothing uploaded.
PDF to JPG / PNG
Render each page of a PDF to a JPG or PNG picture in your browser and download them. Nothing uploaded.
JPG / PNG to PDF
Combine JPG and PNG pictures into a single PDF, reorder them, and download. All in your browser, nothing uploaded.
Rotate PDF
Turn every page or selected pages of a PDF by 90, 180 or 270 degrees and download the fixed file. Private, nothing uploaded.
Delete PDF Pages
Remove the pages you do not want and download the trimmed document. Runs privately in your browser.
Reorder PDF Pages
Drag page thumbnails into a new order and download the rearranged PDF. All in your browser, nothing uploaded.
PDF Page Count & Info
See a PDF page count, file size, page dimensions and metadata like title, author and producer, all in your browser.
Extract PDF Text
Pull the plain text out of a PDF in your browser, then copy it or download a TXT file. Nothing is uploaded anywhere.
Crypto
Category page →
Gwei to ETH Converter
Convert Ethereum gas price units instantly in your browser with full precision and no rounding errors.
Wei to ETH Converter
Convert the smallest Ethereum unit to ether and back with exact 18 decimal precision in your browser.
Ethereum Unit Converter
Convert between all Ethereum denominations at once with exact 18 decimal precision in your browser.
Satoshi to BTC Converter
Convert Bitcoin satoshis to whole BTC and back with exact 8 decimal precision in your browser.
Sats Per Dollar Calculator
Enter the Bitcoin price to see how many satoshis one US dollar buys and what any dollar amount is worth in sats.
Crypto Profit Calculator
Enter entry price, exit price, amount and fees to see net profit or loss, return percentage and total value instantly.
Crypto DCA Calculator
Enter your buy prices and amounts to find your average cost basis, total coins and blended entry.
Crypto Average Buy Price Calculator
Enter each purchase price and coin quantity to find your weighted average cost basis and total holdings.
Impermanent Loss Calculator
Enter the price ratio change to see impermanent loss percent versus simply holding the tokens.
Liquidation Price Calculator
Enter entry price, leverage and side to find your liquidation price.
Crypto Position Size Calculator
Enter account size, risk percent, entry and stop loss to find the position size that caps your loss per trade.
Crypto Leverage Calculator
Enter margin and position size to find your leverage, or enter leverage and margin to find the position you can open.
Funding Rate Calculator
Enter position size, funding rate and time to see the funding cost or income you pay or earn over a period.
Crypto Staking Rewards Calculator
Enter staked amount, APR and duration to project your staking income with and without compounding.
APY to APR Converter (Crypto)
Convert between annual percentage rate and yield for any compounding frequency used in DeFi staking and lending.
Token Market Cap Calculator
Enter price, circulating supply and total supply to compute market capitalization and fully diluted valuation.
Stop Loss & Take Profit Calculator
Enter entry price and percentages to get exact stop and target prices for long or short trades.
Risk Reward Ratio Calculator
Enter entry, stop loss and target prices to get your risk to reward ratio and break even win rate.
Ethereum Gas Fee Calculator
Enter gas price in gwei and gas limit to compute transaction cost in ETH and in dollars at any ETH price.
Ethereum Address Checksum Tool
Convert a 0x address to its checksummed form and validate the mixed case checksum entirely in your browser.
BIP39 Seed Phrase Word Count Checker
Paste a recovery phrase to verify it has a valid 12, 15, 18, 21 or 24 word length before importing.
Percentage To Recover Calculator
Enter a drawdown percent to see the exact gain needed to get back to even, a key rule for crypto losses.
Rule of 72 Crypto Calculator
Enter an annual return to estimate how long it takes your holdings to double, or the return needed to double in a time.
Airdrop Value Calculator
Enter tokens received and token price to see your airdrop value, plus per wallet value across multiple wallets.
ROI Multiple Calculator (Crypto)
Convert between a return multiple like 10x and a percentage gain, and find your profit from an investment amount.
Trading Fee Breakeven Calculator
Enter maker and taker fees to find the minimum price move needed to cover round trip trading costs.
Crypto Portfolio Allocation Calculator
Enter each holding value to see percentage weights and how far each is from a target allocation to rebalance.
Date & Time
Category page →
Days Until Date
Count how many days are left until any future date. A live countdown showing days, weeks, hours and minutes remaining until your target day.
Add Days to Date
Add a number of days, weeks, months or years to any date and get the exact resulting calendar date, including the day of the week.
Subtract Days from Date
Subtract days, weeks, months or years from any date to find a past calendar date, complete with the exact day of the week it falls on.
Business Days Calculator
Count the working days between two dates, excluding weekends. See business days, total days, weekend days and full weeks in the range.
Add Business Days to Date
Add a number of working days to a start date, skipping weekends, to find the resulting business date and the day of the week it lands on.
ISO Week Number Calculator
Find the ISO 8601 week number for any date, plus the week year, the day of the week and the range of dates that week covers.
Day of the Week Finder
Find out what day of the week any date falls on, past or future. Enter a birthday or historic date and see the exact weekday instantly.
Leap Year Checker
Check whether any year is a leap year and see why. Lists the next several leap years and shows how many days that year has.
Days in Month Calculator
See how many days are in any month of any year, including February in leap years, plus the first and last weekday of that month.
Time Duration Calculator
Add or subtract times in hours, minutes and seconds. Combine multiple durations and get the total in HH:MM:SS and in decimal hours.
World Time Zone Converter
Convert a time from one time zone to another using real IANA zones. Pick a date and time, choose two cities, and see the matching local time.
Hours Worked Calculator
Calculate total hours worked from a clock in and clock out time, minus break minutes. Shows hours and minutes plus decimal hours for pay.
Weekly Timesheet Calculator
Add up hours across a full week from daily clock in and clock out times with breaks. See each day and the weekly total in decimal hours.
Sleep Bedtime Calculator
Find the best times to go to sleep or wake up based on 90 minute sleep cycles, so you wake between cycles feeling more refreshed.
Countdown to Date and Time
A live countdown to any date and time. Watch the days, hours, minutes and seconds tick down to a launch, event or deadline in real time.
Time Lived Calculator
See how long you have been alive in total days, hours, minutes and seconds from your birth date, updated live down to the second.
Day of the Year Calculator
Find which numbered day of the year any date is, from 1 to 365 or 366, plus how many days are left in the year and the percentage elapsed.
Next Birthday Countdown
Count down to your next birthday. Enter your birth date to see the days until it, the weekday it falls on, and the age you will turn.
Weekday Occurrence Counter
Count how many times each weekday occurs between two dates. See exactly how many Mondays, Fridays or any weekday fall in your date range.
Duration Between Two Times
Work out how long is between two clock times on the same day or overnight. Get the gap in hours and minutes and in decimal hours.
Quarter of the Year Finder
Find which fiscal quarter a date falls in. See the quarter number, its start and end dates, and how many days are left in that quarter.
Moon Phase Calculator
Find the moon phase for any date. See the phase name, illumination percent and the moon age in days, computed from the lunar cycle.
Date to Ordinal and Long Format
Convert a date into ordinal and long written formats. See the 1st, 2nd, 3rd style day, the full spelled out date and other common formats.
Week of the Month Finder
Find which week of the month a date falls in and which occurrence of that weekday it is, like the second Tuesday or the last Friday.
Live Unix Time Clock
A live clock showing the current Unix epoch time in seconds and milliseconds, plus the matching UTC and local date and time, updating each second.
Time Ago Calculator
Turn a past date and time into a plain time ago phrase like 3 days ago or 5 months ago, plus the exact elapsed days, hours and minutes.
Data
Category page →
JSON to XML
Turn JSON objects and arrays into clean, indented XML for legacy APIs, SOAP services, config files and data feeds.
XML to JSON
Parse XML documents into clean, readable JSON with attributes and repeated elements handled correctly in your browser.
TSV to CSV
Turn tab separated values into proper comma separated CSV, quoting fields that contain commas, quotes or line breaks.
CSV to TSV
Turn comma separated values into tab separated text you can paste straight into spreadsheets, respecting quoted fields.
CSV to Markdown Table
Turn CSV data into a clean GitHub flavored Markdown table with aligned columns for READMEs, docs and issues.
JSON to TypeScript
Generate a typed interface from a JSON sample, inferring nested objects, arrays and optional fields automatically.
JSON to Go Struct
Generate typed Go structs with json tags from a JSON sample, inferring nested types, slices and field names.
JSON to PHP Array
Turn JSON into a valid PHP array literal using short bracket syntax, ready to paste into a config or fixture file.
JSON Unescape
Turn an escaped JSON string back into readable text, decoding backslash escapes, quotes, newlines and unicode sequences.
JSON to Query String
Turn a JSON object into a URL encoded query string, flattening nested objects and arrays with bracket notation.
Query String to JSON
Parse a URL query string into a clean JSON object, decoding values and grouping repeated keys into arrays.
JSON Sort Keys
Sort every object key alphabetically at all nesting levels for deterministic diffs, cleaner configs and reproducible output.
JSON Flatten
Collapse a nested JSON object into flat dot notation keys, turning deep structures into a single level map for easy diffing.
JSON Unflatten
Rebuild a nested JSON object from flat dot notation keys, expanding paths and array indices back into real structure.
NDJSON to JSON Array
Turn newline delimited JSON into a single JSON array, parsing each line and reporting any bad rows clearly.
JSON Array to NDJSON
Turn a JSON array into newline delimited JSON, one compact record per line, ready for streaming and log tools.
List to JSON Array
Turn a plain list of lines into a JSON array of strings or numbers, trimming blanks and optionally deduplicating.
CSV Column Extractor
Pull a single column out of a CSV file by name or number, with a real parser that respects quoted fields and commas.
CSV to SQL Insert
Turn CSV rows into ready to run INSERT statements with a header derived column list and safely quoted values.
JSON to HTML Table
Turn an array of JSON objects into a clean HTML table with a header row and escaped cells, ready to paste anywhere.
JSON Path Extractor
Pull a value from deep inside JSON using a dot and bracket path like user.tags[0], with clear errors when a path is missing.
JSON Stringify Viewer
Parse and re serialize JSON with a chosen indent, or produce an escaped single string value ready to embed in code.
Fixed Width to CSV
Split fixed column mainframe or report text into CSV by specifying column widths, trimming padding from each field.
JSON Keys Extractor
List every unique key path in a JSON document, including nested objects and arrays, so you can map or document a payload.
JSON to TOML
Turn JSON config into TOML tables and key value pairs for Rust, Python and other tools that read TOML config files.
CSV Transpose
Flip rows and columns of a CSV so headers become the first column, using a real parser that respects quoted fields.
JSON to ENV
Turn a flat JSON object into dotenv KEY=value lines, upper casing keys and quoting values that contain spaces.
SEO
Category page →
Title Tag Length Checker
Measure your SEO title in characters and pixels and see if Google will truncate it on desktop and mobile. Instant, private.
Meta Description Length Checker
Count characters and pixel width and see if Google will truncate your description on desktop and mobile. Private.
Keyword Density Checker
Paste your content to see word and phrase frequency, density percentages and total word count. Spot keyword stuffing fast.
Reading Time Calculator
Paste text to estimate how long it takes to read, with word count, sentence count and separate speaking time for scripts.
Canonical Tag Generator
Enter your preferred page URL to create a valid rel canonical link tag and stop duplicate content from splitting your rankings.
Hreflang Tag Generator
Map languages and regions to URLs to build valid hreflang link tags with x-default for correct international SEO targeting.
Noindex Meta Tag Generator
Build a robots meta tag with noindex, nofollow, noarchive and other directives to keep pages out of search results. Private.
Twitter Card Meta Tag Generator
Enter title, description, image and handles to build valid twitter card meta tags for rich link previews on X and Twitter.
Organization Schema (JSON-LD) Generator
Build valid JSON-LD structured data with your name, logo, URL and social profiles to boost brand knowledge panels.
FAQ Schema (JSON-LD) Generator
Add questions and answers to build valid FAQPage JSON-LD structured data that can earn rich results in Google search.
Breadcrumb Schema (JSON-LD) Generator
Enter your page path steps to build valid BreadcrumbList JSON-LD structured data for cleaner breadcrumb search results.
Article Schema (JSON-LD) Generator
Enter headline, author, dates and image to build valid Article JSON-LD structured data for richer news and blog results.
Product Schema (JSON-LD) Generator
Enter name, price, currency, availability and rating to build valid Product JSON-LD structured data for rich shopping results.
Sitemap XML Generator
Paste a list of URLs to build a valid XML sitemap with lastmod, changefreq and priority, ready to submit to search engines.
Keyword Combiner & Mixer
Combine two or three lists of words into every keyword phrase permutation for PPC and SEO, with optional match type brackets.
Anchor Text Suggester
Enter a keyword and target URL to get varied, natural anchor text ideas across exact, partial, branded and generic types.
SEO Content Score Checker
Paste your article and target keyword to score word count, keyword usage, headings and readability against on-page best practices.
YouTube Tag & Description Builder
Turn your video topic keywords into comma separated tags and a description with timestamps and hashtags for better discovery.
CTR & Ad Metrics Calculator
Enter impressions, clicks, conversions and spend to compute click through rate, conversion rate, CPC, CPA and ROAS instantly.
Page Weight Budget Calculator
Add HTML, CSS, JS, image and font sizes to see total page weight and estimated load time across 3G, 4G and broadband speeds.
Social
Category page →
Tweet Character Counter
Free tweet character counter that respects X limits, counts each URL as 23 characters, and shows how many tweets long text needs.
Twitter Thread Splitter
Split long text into a numbered X thread with each tweet kept under 280 characters. Breaks on word boundaries and adds 1/n numbering.
Multi Platform Character Counter
Count your text against every social media limit at once: X, Instagram, TikTok, LinkedIn, Facebook, YouTube, Threads and Bluesky.
Hashtag Counter
Count the hashtags in a caption and check against Instagram, TikTok and X limits. Lists each unique tag and flags duplicates instantly.
Hashtag Set From Keywords
Turn keywords or a caption into a ready to paste hashtag set. Generates camel case and lowercase tags and dedupes them automatically.
Reels Hashtag Set Generator
Build a balanced Instagram Reels hashtag set that mixes broad, medium and niche tags around your topic, sized to stay under the 30 tag cap.
Instagram Caption Generator
Generate Instagram caption ideas from your topic with a hook, body, emoji and a call to action. Pick a tone and copy the caption instantly.
Instagram Bio Generator
Create a punchy Instagram bio from your name, role and interests. Builds a stacked bio with emoji and a call to action under 150 characters.
Twitter Bio Generator
Generate a tight X bio from your role, focus and vibe. Builds a bio under the 160 character limit with separators and an optional link cue.
Instagram Line Break Generator
Add real line breaks and spacing to Instagram captions and bios that survive posting. Inserts invisible characters so gaps do not collapse.
Engagement Rate Calculator
Calculate social media engagement rate from likes, comments, shares and saves. Get rate by followers and by reach with a quality benchmark.
Follower to Following Ratio Calculator
Work out your followers to following ratio and see what it signals. Enter both counts to get the ratio, a percentage and a quick read.
TikTok Money Calculator
Estimate TikTok earnings from views using a per thousand view rate. See low, average and high estimates for a video and a monthly total.
YouTube Money Calculator
Estimate YouTube ad revenue from views and RPM. Enter monthly views and a realistic RPM to see daily, monthly and yearly income ranges.
YouTube Title Length Checker
Check YouTube title length so it does not get cut off. See character count against the 100 cap and the roughly 60 char display truncation point.
YouTube Tag Extractor
Extract clean comma separated YouTube tags from a block of text or keywords. Dedupes, trims, and counts against the 500 character tag budget.
YouTube Timestamp Link Generator
Turn a YouTube URL and a time into a link that jumps to that moment. Also builds chapter timestamp lists for your video description.
Discord Timestamp Generator
Generate Discord timestamp codes that show the right local time for everyone. Pick a date, time and style to get the <t:unix:style> code.
Social Media Image Size Reference
Reference table of current image and video dimensions for Instagram, X, Facebook, TikTok, YouTube, LinkedIn and Pinterest. Search and copy sizes.
Best Time to Post Reference
Reference of generally recommended best times to post on Instagram, X, Facebook, TikTok, LinkedIn and Pinterest, adjusted to your local timezone.
Call to Action Generator
Generate call to action ideas for social posts by goal: get comments, saves, shares, follows, clicks or sign ups. Copy a fresh CTA in one click.
Emoji Copy Picker
Browse a categorized emoji grid and click any emoji to copy it. Search by name, filter by category, and build a string of emoji for your posts.
Network
Category page →
URL Parser
Break any URL into protocol, host, port, path, query string and hash instantly in your browser using the native URL API.
Query String to Table
Paste a URL query string and see every parameter listed as clean key and value rows, decoded and easy to read, in your browser.
Query String Builder
Enter key and value pairs and get a correctly URL encoded query string ready to append to any link, built in your browser.
URL Query Value Encoder
Percent encode a single value for safe use in a query string, or decode one back, all in your browser.
CIDR Calculator
Enter an IPv4 CIDR block and get the network address, broadcast, usable host range, subnet mask and total host count instantly.
Subnet Mask Calculator
Pick a CIDR prefix and see the matching dotted decimal mask, wildcard mask, binary form and host count, all in your browser.
CIDR to Netmask Converter
Turn a CIDR prefix like /26 into its dotted decimal subnet mask and back again instantly, all in your browser.
Netmask to CIDR Converter
Paste a dotted decimal subnet mask and get its CIDR prefix length, with validation for contiguous masks, in your browser.
IPv4 Range Calculator
Enter a start and end IPv4 address and get the exact number of addresses in the inclusive range, all computed in your browser.
IP to Integer Converter
Turn a dotted decimal IPv4 address into its single 32-bit unsigned integer, and convert an integer back to an IP, in your browser.
IP to Binary Converter
See any IPv4 address as its 32-bit binary form, octet by octet, plus hex and integer, all computed instantly in your browser.
IPv4 and IPv6 Validator
Check whether a string is a valid IPv4 or IPv6 address and see its type, class and whether it is private, all in your browser.
IPv6 Expander and Compressor
Expand a shortened IPv6 address to its full form or compress a long one to the shortest valid form, in your browser.
MAC Address Formatter
Normalize a MAC address and convert it between colon, hyphen, dot and bare hex separators, uppercase or lowercase, in your browser.
User Agent Parser
Paste any browser user agent string and read the likely browser, engine, operating system and device type, all parsed in your browser.
HTTP Status Code Lookup
Search every standard HTTP status code by number or name and read its meaning and category, all offline in your browser.
HTTP Header Reference
Search common request and response headers and read what each one does, whether offline in your browser, no lookups needed.
MIME Type Lookup
Find the correct Content-Type for any file extension, or search by type, instantly and offline in your browser, no server needed.
Well Known Ports Lookup
Search common TCP and UDP ports by number or service name and see what each one is used for, offline in your browser.
DNS Record Types Reference
Search common DNS record types like A, AAAA, MX and TXT and read what each one does, offline in your browser.
WHOIS Lookup Link Builder
Enter a domain and get ready to open WHOIS and DNS lookup links for several services, built entirely in your browser.
Punycode Domain Converter
Turn an international domain name into its ASCII punycode form and back, using the browser URL engine, all offline in your browser.
Science
Category page →
Ohm's Law Calculator
Enter any two of voltage, current, resistance or power and instantly solve for the other two using V=IR and P=VI.
Resistor Color Code Calculator
Pick the bands on a 4, 5 or 6 band resistor and read the resistance value, tolerance and temperature coefficient.
Scientific Notation Converter
Convert any decimal number to scientific and E notation, or expand scientific notation back to a plain decimal.
Significant Figures Counter
Count the sig figs in any number and round it to a chosen number of significant figures instantly.
pH Calculator
Convert between hydrogen ion concentration and pH, find pOH and hydroxide concentration, and classify a solution as acid or base.
Molarity Calculator
Solve for molar concentration, moles of solute, or solution volume using M equals moles divided by liters. Enter any two.
Molar Mass Calculator
Type a chemical formula like H2O or Ca(OH)2 and get its molar mass in grams per mole with a per element breakdown.
Density Calculator
Solve for density, mass, or volume using density equals mass over volume. Enter any two values and get the third instantly.
Force Calculator (F = ma)
Solve for force, mass, or acceleration with F equals m times a. Enter any two and get the third.
Kinetic Energy Calculator
Compute kinetic energy from mass and velocity, or solve for mass or speed, using KE equals one half m v squared.
Gravitational Potential Energy Calculator
Compute PE from mass, gravity and height using PE equals m g h, or solve for any missing value.
Wavelength Frequency Converter
Convert between wavelength and frequency for light or any wave using c equals lambda times f. Set the wave speed.
Voltage Divider Calculator
Enter the input voltage and two resistor values to find the output voltage using Vout equals Vin times R2 over R1 plus R2.
Capacitor Code Calculator
Enter a 3 digit ceramic capacitor code like 104 and get the capacitance in picofarads, nanofarads and microfarads.
Weight on Other Planets Calculator
Enter your weight on Earth to see what you would weigh on the Moon, Mars, Jupiter and every planet in the solar system.
Ideal Gas Law Calculator
Solve PV equals nRT for pressure, volume, moles or temperature. Enter any three values using SI units and get the fourth.
Torque Calculator
Compute torque from force, lever arm length and angle using tau equals force times radius times the sine of the angle.
Percent Error Calculator
Compare a measured value against the true value and get the absolute error and percent error for lab reports instantly.
Decibel (dB) Calculator
Convert a power or amplitude ratio to decibels and back, using 10 log for power and 20 log for voltage or amplitude ratios.
Speed Distance Time Calculator
Solve for speed, distance or time using speed equals distance over time. Enter any two values and get the third.
Acceleration Calculator
Find acceleration from the change in velocity over time using a equals delta v over t, or solve for velocity or time.
Projectile Range Calculator
Enter launch speed and angle to find range, maximum height and flight time for a projectile on level ground.
Half-Life Calculator
Find the remaining amount of a decaying substance after a given time, or work out its half-life from an amount and elapsed time.
Specific Heat Calculator
Solve the heat equation Q equals m c delta T for heat energy, mass, specific heat or temperature change. Enter any three.
Math
Category page →
Prime Number Checker
Enter any whole number and instantly see whether it is prime or composite, with its smallest factor when it is not.
Prime Factorization Calculator
Break any whole number into its prime factors and see the result in expanded and exponent form instantly.
Factorial Calculator
Compute n factorial for any non-negative integer, with exact big-integer results and no rounding for large inputs.
Fibonacci Sequence Generator
Produce the first N Fibonacci numbers with exact big-integer values, plus the nth term and running sum.
Percentage Increase and Decrease Calculator
Find the percent change between two numbers and the new value after applying a percentage.
Ratio Simplifier
Reduce any ratio to its simplest whole-number form and see the decimal equivalent, using the greatest common divisor.
Mean, Median, Mode and Range Calculator
Paste a list of numbers and get all four measures of center and spread instantly, with the count and sum.
Number to Words Converter
Spell any whole number in plain English, from zero up into the trillions, for checks, contracts and homework.
Base Converter (Any Base 2 to 36)
Convert a number between binary, octal, decimal, hex and any custom base with one entry.
Modulo Calculator
Find the remainder of a division, plus the quotient and the true mathematical modulo, for any two numbers instantly.
Exponent Calculator
Raise any base to any power, including negative and fractional exponents, and see the exact or precise decimal result.
Logarithm Calculator
Compute the log of any positive number in any base, including natural log and log base 10, with the exponent check shown.
Permutation and Combination Calculator
Compute nPr and nCr for any n and r using exact big-integer math, with the factorial formulas shown.
Probability Calculator
Find the probability of single and combined events, including AND, OR, and NOT, as a fraction, decimal and percentage.
Fraction to Decimal Converter
Turn any fraction into its decimal value and percentage, and see repeating digits marked clearly.
Decimal to Fraction Converter
Turn any decimal into its exact simplified fraction, including repeating decimals, plus a mixed number form.
Proportion Solver (Solve for X)
Cross multiply to solve for the missing value in a proportion a over b equals c over x, with the work shown.
Slope Calculator (Two Points)
Enter two points and get the slope, the line equation, the angle in degrees, and the y-intercept instantly.
Distance Between Two Points Calculator
Use the distance formula to find the straight-line length between two coordinates, with the steps shown.
Midpoint Calculator
Find the exact midpoint between two coordinates using the midpoint formula, averaging the x and y values.
Scientific Notation to Decimal
Switch between standard decimal numbers and scientific notation both ways, with the E-notation form shown too.
Rounding Calculator (Decimals and Sig Figs)
Round any number to a set number of decimal places, significant figures, or the nearest ten, hundred or thousand.
LCM of a List Calculator
Find the least common multiple of many numbers at once, using exact big-integer math so large results stay precise.
GCF of a List Calculator
Find the GCF of many numbers at once using the Euclidean algorithm, exact for very large values.
Arithmetic Series Sum Calculator
Sum an arithmetic sequence from its first term, common difference and length, or find the nth term instantly.
Triangle Area Calculator (Heron Formula)
Find the area of any triangle from its three sides using Heron formula, or from a base and height, instantly.
Finance
Category page →
Debt Snowball Calculator
Order your debts smallest balance first, apply a monthly extra payment, and see your payoff order and months to debt free.
Debt Avalanche Calculator
Target the highest interest rate debt first to minimize total interest, and see your months to payoff and interest saved.
FIRE Number Calculator
Find how much you need invested to retire early using the 4 percent rule, plus years to reach financial independence.
Coast FIRE Calculator
Find the amount you need invested today so compound growth alone funds retirement without adding another dollar.
Inflation Calculator
See how much future buying power your money loses over time, or what an amount will be worth after years of inflation.
Real Rate of Return Calculator
Convert a nominal investment return into the inflation adjusted real return using the exact Fisher equation.
Salary to Hourly Calculator
Convert an annual salary into an hourly wage based on your weekly hours and weeks worked per year.
Hourly to Salary Calculator
Convert an hourly wage into an annual salary using your weekly hours and weeks worked per year.
Take Home Pay Estimator
Enter gross salary and deduction percentages to estimate net pay per year, month, and paycheck instantly.
Cost of Living Difference Calculator
Compare two cities by index and find the salary you need to keep the same standard of living after moving.
Future Value Calculator
Find what a lump sum plus regular contributions grows to with compound interest over a set number of years.
Present Value Calculator
Discount a future amount back to what it is worth today using a discount rate and a number of periods.
Annuity Payment Calculator
Find the fixed periodic payment a lump sum can provide, or the payout from a present value over a set term.
Savings Rate Calculator
Find the percentage of your income you save each month and see how it compares to common financial independence targets.
Tip and Split Calculator
Add a tip, optionally round the total, and split the bill evenly across any number of people for a clean per person amount.
Discount and Tax Calculator
Apply a percent discount then add sales tax to get the final checkout price, the amount saved, and the tax charged.
Sinking Fund Calculator
Work out the monthly amount to set aside to reach a savings target by a deadline, with or without interest.
50/30/20 Budget Calculator
Split your monthly take home pay into needs, wants, and savings using the popular 50/30/20 budgeting rule.
Raise Percentage Calculator
Find your pay raise as a percentage and dollar amount, or work out your new salary from a given raise percentage.
Dollar Cost Averaging Calculator
Project a recurring investment growing at a steady return and see contributions versus interest earned.
Rule of 114 Calculator
Estimate the years to triple your money at a given annual return, plus the rate needed to triple in a set time.
Lump Sum vs Payments Calculator
Compare taking a cash lump sum now against a stream of future payments using present value and a discount rate.
Time to Reach Savings Goal Calculator
Find how many months and years it takes to reach a savings goal given your deposits and interest rate.
Effective Hourly Rate Calculator
Reveal what you truly earn per hour once commute and unpaid work hours are added to your paid time.
Health & Fitness
Category page →
Macro Split Calculator
Turn your daily calorie target into protein, carb, and fat grams using a percentage split you choose, all in your browser.
Protein Intake Calculator
Estimate grams of protein per day from your body weight and activity goal, worked out instantly in your browser.
Calorie Deficit Calculator
Enter maintenance calories and a target loss rate to see your daily deficit and adjusted intake, computed in your browser.
Max Heart Rate Calculator
Estimate your maximum heart rate from age using two proven formulas, side by side, all in your browser.
Target Heart Rate Zone Calculator
Get Karvonen training zones from your age and resting heart rate, calculated instantly in your browser.
Waist to Hip Ratio Calculator
Divide waist by hip measurement and see the WHO health category by sex, computed instantly in your browser.
Waist to Height Ratio Calculator
Divide waist by height and see the healthy range guideline, worked out instantly in your browser.
Lean Body Mass Calculator
Estimate lean mass and fat mass from weight and body fat, or the Boer formula, all in your browser.
Ponderal Index Calculator
Compute the corpulence index using weight divided by height cubed, worked out instantly in your browser.
Body Surface Area Calculator
Estimate BSA in square metres using the Mosteller and Du Bois formulas, side by side, in your browser.
Running Pace to Speed Converter
Turn minutes per kilometre or mile into km/h and mph, and back again, instantly in your browser.
Race Finish Time Predictor
Estimate your finish time at a new distance from a recent race using the Riegel formula, computed in your browser.
One Rep Max Multi Formula Calculator
Estimate your 1RM from weight and reps using Epley, Brzycki, Lombardi, and Lander in your browser.
Steps to Distance Calculator
Convert your step count into kilometres and miles using your height or a custom stride, in your browser.
Blood Alcohol Content Calculator
Approximate BAC from drinks, weight, sex, and time using the Widmark formula, all in your browser.
VO2 Max Estimator
Approximate your aerobic fitness from a one mile walk test or resting heart rate, calculated in your browser.
Smoking Cost Calculator
See how much cigarettes cost you per week, month, year, and decade based on packs and price, in your browser.
Sleep Debt Calculator
Compare your recent sleep against a nightly goal to see your accumulated sleep debt for the week, in your browser.
Ovulation Window Calculator
Estimate your fertile window and likely ovulation day from your last period and cycle length, in your browser.
Calories to Kilojoules Converter
Switch between food calories and kilojoules instantly, both directions, all in your browser.
Pregnancy Week Calculator
Find your current gestational week, trimester, and days remaining from your last period, in your browser.
BMI Prime Calculator
See your BMI as a ratio to the upper healthy limit of 25, with category, computed instantly in your browser.
Reps Per Minute Pace Calculator
Turn a total rep goal and time limit into a pace, sets, and rest plan for pushups or any exercise, in your browser.
Daily Water Intake in Ounces Calculator
Estimate daily fluid needs from body weight and activity, shown in ounces, cups, and litres, in your browser.
Education
Category page →
Weighted GPA Calculator
Add course grades, credit hours and class level (regular, honors, AP or IB) to get your weighted GPA.
Semester GPA Calculator
Enter each class letter grade and credit hours for one term to get your semester grade point average on a 4.0 scale.
College GPA Calculator
Enter each course grade and credits to compute your college GPA on the standard 4.0 university scale.
High School GPA Calculator
Free high school GPA calculator on the 4.0 unweighted scale. Enter your class grades to instantly find your high school grade point average.
Grade Calculator
Enter your scores and the weight of each category to compute your overall course grade and letter.
Final Exam Grade Needed Calculator
Find the score you need on your final exam to hit your target grade. Enter your current grade, the target and the final worth to get the answer.
Test Score Percentage Calculator
Convert correct answers out of total questions into a percentage and letter grade. Free instant test and quiz score calculator for students.
Letter Grade Calculator
Convert a percentage score into a letter grade and 4.0 grade point instantly. Free percentage to letter grade calculator with a full scale table.
Pass or Fail Grade Calculator
Check if your score passes and how far you are from the passing mark. Free pass or fail calculator with a custom passing threshold for any test.
Class Rank Percentile Calculator
Convert your class rank and class size into a percentile and top percent. Free class rank percentile calculator for high school and college.
Points Needed to Pass Calculator
Work out how many more points you need to reach your target grade. Free points needed calculator using points earned out of total points possible.
Grade Curve Calculator
Apply a class curve to a raw score. Free grade curve calculator supporting flat point boost, square root curve and top score scaling methods.
Attendance Percentage Calculator
Calculate your attendance percentage from classes attended and total held, and see how many you can still miss to stay above a required minimum.
Credit Hours to Study Time Calculator
Estimate weekly study hours and total workload from your enrolled credit hours using the standard two hours of study per credit guideline.
Reading Assignment Time Estimator
Estimate how long a reading assignment will take from page or word count, difficulty and your reading speed. Free study planner for students.
Study Time Planner
Split your available study hours across subjects by priority weight. Free study time planner that shows how many hours to give each subject per week.
Exam Countdown Calculator
Count down to your exam date and see days, weeks and study days left, plus suggested daily study time to cover your material in time.
Grade Impact Planner
See how a future assignment score changes your overall grade before you submit it. Free grade impact planner using current grade and item weight.
Spaced Repetition Interval Calculator
Generate spaced repetition review dates for a flashcard using a Leitner style schedule. Free spaced repetition interval calculator for studying.
Weighted Average Grade Calculator
Average several grades where each has a different weight. Free weighted average grade calculator for combining tests, projects and homework fairly.
IB Diploma Points Calculator
Add up your IB subject grades plus the extended essay and theory of knowledge bonus to get your total out of 45 and check if you pass the diploma.
Percentage to 4.0 GPA Converter
Convert a percentage grade into a 4.0 scale GPA value and letter grade. Free percentage to GPA converter for transcripts and study abroad applications.
Business
Category page →
Markup Calculator
Enter cost and markup percent to get the selling price, profit and resulting margin instantly in your browser.
Margin vs Markup Calculator
Convert between margin and markup. Enter one percentage to see the other, plus the price built from your cost. Fast, browser side, no signup.
Gross Profit Calculator
Enter revenue and cost of goods sold to get gross profit and gross margin percent instantly in your browser.
Net Profit Margin Calculator
Enter revenue and total expenses to get net profit and net margin percent instantly, all in your browser.
Operating Margin Calculator
Enter revenue, cost of goods and operating expenses to get operating income and margin percent in your browser.
EBITDA Margin Calculator
Enter revenue, expenses, depreciation and amortization to get EBITDA and EBITDA margin percent in your browser.
Cost Plus Pricing Calculator
Add material, labor and overhead, apply a markup, and get your selling price and profit per unit instantly.
Customer Acquisition Cost Calculator
Divide your sales and marketing spend by new customers to find customer acquisition cost instantly in your browser.
Customer Lifetime Value Calculator
Enter average order value, purchase frequency, lifespan and margin to estimate customer lifetime value in your browser.
CAC Payback Period Calculator
Find how many months it takes to recover acquisition cost from customer gross profit, right in your browser.
Net Revenue Retention Calculator
Enter starting MRR, expansion, contraction and churn to get NRR and GRR percent in your browser.
Revenue Growth Rate Calculator
Compare two periods to get percent growth and the absolute change in revenue instantly in your browser.
Conversion Rate Calculator
Divide conversions by visitors to get your conversion rate percent, plus visitors needed per goal, in your browser.
Average Order Value Calculator
Divide total revenue by number of orders to find AOV instantly, right in your browser. No signup needed.
Invoice Total Calculator
Add line items, apply a discount and tax, and get the subtotal, tax and grand total instantly in your browser.
Employee Cost Calculator
Add salary, payroll taxes, benefits and overhead to find the true annual and hourly cost of an employee.
Break Even Units Calculator
Enter fixed costs, price and variable cost per unit to find the units and revenue needed to break even.
Cooking
Category page →
Recipe Scaler
Multiply or divide any recipe by a factor or by target servings and it rescales every ingredient line automatically.
Oven Temperature Converter
Convert between Celsius, Fahrenheit, gas mark, and fan (convection) oven settings instantly as you type.
Baking Pan Size Converter
Adjust a recipe for a different pan by comparing pan area and volume, so you scale batter to avoid over or underfilling.
Butter Converter
Convert butter between US sticks, tablespoons, cups, grams, and ounces instantly, using standard stick weights for recipes.
Cups to Grams Converter
Convert cups to grams by ingredient using common baking densities for flour, sugar, butter, and more, live as you type.
Coffee to Water Ratio Calculator
Enter your brew ratio and cups to get exact grams of coffee and water for pour over, French press, and drip.
Meat Roasting Time Calculator
Estimate oven roasting time by weight and doneness for beef, pork, and lamb, with target internal temperatures.
Turkey Cooking Time Calculator
Get roasting time and thaw time by turkey weight for a stuffed or unstuffed bird, with a safe internal temperature.
Ingredient Substitution Finder
Search a common ingredient and get proven kitchen substitutes with the right amounts for baking and cooking.
Air Fryer Conversion Calculator
Convert conventional oven temperature and time to air fryer settings by lowering the temp and shortening the time.
Slow Cooker Time Converter
Convert conventional oven or stovetop cooking time to slow cooker low and high settings for stews, roasts, and soups.
Yeast Converter
Convert between active dry, instant, and fresh (cake) yeast by weight using standard baking ratios, updating live as you type.
Egg Size Substitution Calculator
Convert a recipe between small, medium, large, and extra-large eggs by liquid volume so ratios stay correct.
Baker Hydration Percentage Calculator
Compute dough hydration percentage from flour and water weights, or solve for the water needed to hit a target.
Sourdough Starter Feeding Calculator
Work out feeding amounts from a ratio like 1:2:2 and starter weight, giving grams of starter, flour, and water.
Bread Water Temperature Calculator
Find the water temperature to hit a target dough temperature using flour temp, room temp, and friction.
Calories Per Serving Calculator
Add up the calories of every recipe ingredient and divide by servings to get calories per portion instantly.
Cocktail Ratio Calculator
Scale a spirit to sweet to sour ratio to any drink volume or number of servings, in ounces or milliliters.
Brine Ratio Calculator
Get the salt and water for a wet brine at a chosen concentration, so poultry and pork come out juicy and seasoned.
Grill Temperature Doneness Guide
Look up safe and target internal temperatures for beef, chicken, pork, fish, and burgers in Celsius and Fahrenheit.
Home & Real Estate
Category page →
Paint Calculator
Enter wall length, height, doors and windows to estimate gallons of paint needed per coat for any room.
Flooring Calculator
Enter room length and width plus a waste factor to find total square footage and boxes of flooring to buy.
Tile Calculator
Enter area size and tile dimensions to find how many tiles and boxes you need including a waste allowance.
Wallpaper Calculator
Enter wall length, height and roll size to estimate how many rolls of wallpaper you need for a room.
Mulch Calculator
Enter bed length, width and depth to find cubic yards of mulch and how many bags you need for landscaping.
Concrete Slab Calculator
Enter slab length, width and thickness to find cubic yards of concrete and 80 lb bags needed.
Gravel Calculator
Enter area length, width and depth to find cubic yards and tons of gravel for a driveway or path.
Topsoil Calculator
Enter area length, width and depth to find cubic yards and bags of topsoil for a garden or lawn.
Grass Seed Calculator
Enter lawn size and seeding rate to find how many pounds of grass seed you need for a new or overseeded lawn.
Lawn Fertilizer Calculator
Enter lawn size, target nitrogen rate and the bag N number to find pounds of fertilizer to apply.
Room BTU Calculator
Enter room size, ceiling height and sun exposure to estimate the BTU rating you need for heating or cooling.
Price Per Square Foot Calculator
Enter a home price and its size to find the cost per square foot and compare listings fairly.
Rent Affordability Calculator
Enter your income and debts to find the monthly rent you can comfortably afford using the 30 percent rule.
Home Affordability Calculator
Enter income, debts, down payment and rate to estimate the home price you can afford to buy.
Property Tax Calculator
Enter home value and the tax rate or mill rate to estimate your annual and monthly property tax bill.
Closing Cost Estimator
Enter the home price and a closing cost percentage to estimate what a buyer pays at closing plus cash needed.
Cap Rate Calculator
Enter net operating income and property price to find the capitalization rate on an investment.
Rental Yield Calculator
Enter monthly rent, property price and costs to find gross and net rental yield on an investment property.
Deck Board Calculator
Enter deck size and board dimensions to estimate how many deck boards and linear feet you need to build a deck.
Drywall Sheet Calculator
Enter wall and ceiling area plus sheet size to estimate how many sheets of drywall you need for a room.
Roof Pitch Calculator
Enter rise and run to find roof slope, angle in degrees and the rafter length multiplier for a roof.
Stair Stringer Calculator
Enter total rise and run to find the number of steps, riser height and tread depth for a code friendly staircase.
Room Area Calculator
Enter length and width to find square footage, and add multiple rooms to get a running total for a whole project.
Plants Per Square Foot Calculator
Enter bed size and plant spacing to find how many plants you need to fill a garden bed or ground cover area.
Automotive
Category page →
Fuel Cost Calculator
Calculate the fuel cost of any trip from distance, fuel economy, and gas price. Works in MPG or L/100km with instant results.
MPG Calculator
Calculate your real miles per gallon from miles driven and gallons used. See the L/100km equivalent and cost per mile too.
L/100km Calculator
Calculate fuel consumption in liters per 100 km from distance and liters used. See the km per liter and MPG equivalent too.
MPG to L/100km Converter
Convert miles per gallon to liters per 100 km and back. Supports both US and Imperial (UK) gallons with the exact formula.
US MPG to Imperial MPG Converter
Convert US MPG to UK Imperial MPG and back. Imperial gallons are larger, so the same car reads higher in UK MPG figures.
Road Trip Fuel Calculator
Plan a road trip budget: enter distance, fuel economy, price, and passengers to see total fuel cost and cost per person.
Cost Per Mile Calculator
Calculate the true cost per mile of driving from fuel, insurance, maintenance, and depreciation over your yearly mileage.
Fuel Savings Calculator
Compare two cars by fuel economy and see the yearly and 5 year fuel savings you get from switching to the more efficient one.
Miles Per Tank Calculator
Calculate how far you can drive on a full tank from your tank size and MPG, plus a safe range that keeps a fuel reserve in the tank.
Car Lease vs Buy Calculator
Compare leasing and buying a car over the same period. See total cost, monthly payment, and the equity you keep by buying.
Car Depreciation Calculator
Estimate how much value a car loses each year. See year by year value from purchase price and an annual depreciation rate.
Tire Size Calculator
Read a tire size code like 225/45R17 and get the overall diameter, sidewall height, circumference, and revolutions per mile.
Tire Size Comparison Calculator
Compare two tire sizes and see the difference in diameter, sidewall, and how much your speedometer reads off with the new size.
Speedometer Error Calculator
Calculate speedometer error after a tire size change. Enter old and new tire diameters to see your true speed at any indicated reading.
Gear Ratio Calculator
Calculate final drive gear ratio from ring and pinion teeth, plus engine RPM at a given speed for your tire size and gearing.
Wheel Offset Calculator
Compare wheel offsets and see how far a new wheel moves in or out. Enter width and offset to find the change at the fender and hub.
Engine Displacement Calculator
Calculate engine displacement from bore, stroke, and cylinder count. Get the result in cc, liters, and cubic inches at once.
Horsepower Torque RPM Calculator
Solve horsepower, torque, or RPM when you know the other two. Uses the classic HP equals torque times RPM over 5252 formula.
Zero to Sixty Estimator
Estimate a car 0 to 60 mph time from horsepower and weight using a power to weight model. See the power to weight ratio too.
EV Charging Cost Calculator
Calculate the cost to charge an electric car from battery size, charge level, charging losses, and your electricity price per kWh.
EV Charging Time Calculator
Estimate how long it takes to charge an electric car from battery size, charger power, and the charge percentage you need.
EV vs Gas Cost Calculator
Compare the fuel cost of an electric car and a gas car per mile and per year, and see how much you would save by going electric.
Oil Change Cost Calculator
Estimate the yearly cost of oil changes and the cost per mile from your interval, mileage, oil, filter, and labor prices.
Geometry
Category page →
Circle Area Calculator
Enter a radius or diameter to get the area of a circle instantly using pi times r squared, right in your browser.
Circle Circumference Calculator
Enter a radius or diameter to get the distance around a circle using 2 pi r, instantly in your browser.
Rectangle Area Calculator
Enter length and width to get the area and perimeter of a rectangle instantly, all in your browser.
Square Area Calculator
Enter the side length to get the area, perimeter and diagonal of a square instantly in your browser.
Trapezoid Area Calculator
Enter the two parallel sides and the height to get the area of a trapezoid instantly in your browser.
Parallelogram Area Calculator
Enter the base and height to get the area of a parallelogram instantly using base times height in your browser.
Rhombus Area Calculator
Enter the two diagonals to get the area of a rhombus instantly using half the product of the diagonals in your browser.
Ellipse Area Calculator
Enter the semi major and semi minor axes to get the area of an ellipse instantly using pi times a times b.
Regular Polygon Area Calculator
Enter the number of sides and side length to get area and perimeter of any regular polygon in your browser.
Hexagon Calculator
Enter the side length to get area, perimeter, and both the long and short diagonals of a hexagon instantly.
Sector Area Calculator
Enter the radius and central angle in degrees to get the area of a pie slice sector instantly in your browser.
Arc Length Calculator
Enter the radius and central angle to get the arc length of a circle using r times theta, instantly in your browser.
Heron Formula Calculator
Enter the three side lengths of a triangle to get its area using Heron formula instantly in your browser.
Triangle Perimeter Calculator
Enter the three side lengths to get the perimeter and semi perimeter of a triangle instantly in your browser.
Pythagorean Theorem Calculator
Enter two sides of a right triangle to find the hypotenuse or a missing leg using a squared plus b squared.
Right Triangle Calculator
Enter the two legs to get the hypotenuse, area, perimeter and both acute angles of a right triangle instantly.
Cube Volume Calculator
Enter the edge length to get the volume, surface area and diagonal of a cube instantly using edge cubed in your browser.
Rectangular Prism Volume Calculator
Enter length, width and height to get the volume and surface area of a box instantly in your browser.
Sphere Volume Calculator
Enter the radius to get the volume and surface area of a sphere instantly using four thirds pi r cubed in your browser.
Cylinder Volume Calculator
Enter the radius and height to get the volume and surface area of a cylinder instantly using pi r squared h.
Cone Volume Calculator
Enter the radius and height to get the volume, slant height and surface area of a cone instantly in your browser.
Pyramid Volume Calculator
Enter the base edge and height to get the volume, slant height and surface area of a pyramid in your browser.
Surface Area of a Box Calculator
Enter length, width and height to get the total surface area of a rectangular box instantly in your browser.
3D Distance Calculator
Enter two points in x y z space to get the straight line distance between them instantly using the 3D distance formula.
Music
Category page →
BPM Tap Counter
Tap a key or button in time with any song and read the tempo in beats per minute instantly in your browser.
Delay Time Calculator
Enter a tempo in BPM and get delay times in milliseconds and Hz for every note value from whole to sixteenth.
Note Frequency Calculator
Pick a note name and octave to see its exact pitch in Hz using equal temperament with A4 tuned to 440 Hz.
Frequency to Note Converter
Enter any pitch in Hz and get the closest musical note, octave and how many cents sharp or flat it sits.
Semitone Frequency Calculator
Enter a starting frequency and a number of semitones to see the resulting pitch in Hz using 12-TET math.
Note Interval Calculator
Pick two notes and see the interval name, the number of semitones and the frequency ratio between them.
Key Transpose Calculator
Enter a musical key and a number of semitones to instantly get the new transposed key, up or down.
Online Metronome
Set any tempo and time signature and get an accurate Web Audio click track right in your browser, no download needed.
Time Signature Reference
Learn what the top and bottom numbers mean, simple versus compound meter, and common signatures with beat groupings.
Tempo Marking Reference
Look up Italian tempo terms like largo, andante and allegro with their beats per minute ranges, or find the term for a BPM.
Chord Note Finder
Pick a root note and chord quality like major, minor or dominant seventh to see the exact notes that make up the chord.
Scale Note Finder
Choose a key and a mode or scale type like major, minor or dorian to list all the notes in the scale instantly.
Cents Calculator
Convert a frequency ratio or two pitches into cents, the fine pitch unit where one hundred cents equals a semitone.
Reverb Decay Calculator
Enter a tempo in BPM to get tempo synced reverb decay and pre delay times in milliseconds for tight mixes.
Octave Frequency Calculator
Enter a frequency and shift it up or down by whole octaves to see how the pitch doubles or halves in Hz.
Note Wavelength Calculator
Enter a musical note or frequency to find its sound wavelength in air, useful for speaker and room acoustics.
Sample Rate and Bit Depth Reference
Compare 44.1 kHz, 48 kHz and higher rates, learn the Nyquist limit, and estimate uncompressed file size per minute.
MIDI Note Number Calculator
Convert between MIDI note numbers, note names and frequency in Hz where middle C is MIDI 60 and A4 is 69.
BPM to Hz Converter
Turn a tempo in beats per minute into a frequency in hertz for setting LFOs, tremolo and modulation to the beat.
Song Length Calculator
Enter tempo, bars and time signature to work out how long a section or full track runs in minutes and seconds.
Writing
Category page →
Readability Score Calculator
Get the Flesch Reading Ease score and grade level for any text instantly in your browser, no sign up.
Flesch-Kincaid Grade Level Calculator
Find the US school grade needed to read your text, computed instantly in your browser.
Gunning Fog Index Calculator
Measure text complexity by grade level using sentence length and complex words, all in your browser.
SMOG Index Calculator
Estimate reading grade from polysyllable counts, the standard for health and medical readability, in your browser.
Coleman-Liau Index Calculator
Get a US grade level from letters and sentences per hundred words, no syllable counting, in your browser.
Automated Readability Index Calculator
Get a US grade level from characters, words and sentences instantly in your browser.
Passive Voice Detector
Find passive sentences and get the passive share of your text instantly in your browser, no upload needed.
Adverb Counter
Highlight -ly adverbs and see what share of your writing they make up, computed instantly in your browser.
Filler Word Finder
Spot padding words like just, really, very and actually so you can cut them, all in your browser.
Cliche Finder
Detect tired phrases like at the end of the day and think outside the box so you can freshen up your writing.
Weasel Word Finder
Catch vague qualifiers like some, many, arguably and reportedly that weaken claims, all in your browser.
Sentence Length Analyzer
See average, longest and shortest sentence lengths and flag overly long sentences, all in your browser.
Average Word Length Calculator
Measure mean characters per word and syllables per word to gauge how dense your writing is.
Syllable Counter
Count syllables in a word, phrase or full text using an English heuristic, computed instantly in your browser.
Lexical Diversity Calculator
Measure vocabulary richness with the type token ratio and root TTR instantly in your browser.
Longest Words Finder
Rank the longest words in your text by character count so you can simplify dense vocabulary, in your browser.
Unique Word Counter
Count distinct words versus total and see your repetition rate instantly in your browser, no upload needed.
Repeated Word Finder
Detect words you overuse and catch adjacent duplicate words in your writing, all in your browser.
Dialogue Percentage Calculator
Measure how much of your story is spoken dialogue versus narration, computed in your browser.
Text Complexity Analyzer
Combine multiple readability formulas into one consensus grade and complexity snapshot, in your browser.
Speaking Time Calculator
Estimate how long your speech or script takes to read aloud at your chosen pace, computed in your browser.
Transition Word Counter
Measure how many sentences use transition words like however and therefore to improve flow, in your browser.
Statistics
Category page →
Confidence Interval Calculator
Enter a sample mean, standard deviation and size to get the lower and upper bounds at 90, 95 or 99 percent.
Sample Size Calculator
Enter your confidence level, margin of error and population to find how many responses you need.
Margin of Error Calculator
Enter a sample proportion, sample size and confidence level to find the plus or minus error of your poll.
Z-Score Calculator
Enter a value, mean and standard deviation to find how many standard deviations it sits from the average, with percentile.
P-Value from Z-Score Calculator
Enter a z value and choose a one or two tailed test to get the exact p-value for hypothesis testing.
Percentile Calculator
Paste a data set and pick a percentile from 0 to 100 to find the value at that position using linear interpolation.
Percentile Rank Calculator
Paste a data set and a value to find what percent of the numbers fall at or below it, from 0 to 100.
Correlation Coefficient Calculator
Paste paired x and y data to find r, the strength and direction of a linear relationship.
Covariance Calculator
Paste paired x and y data to find the sample and population covariance measuring how two variables vary together.
Standard Error of the Mean Calculator
Paste a data set or enter a standard deviation and sample size to find the standard error of the mean.
Variance Calculator
Paste a data set to find the sample and population variance, plus standard deviation, mean and sum of squares.
Coefficient of Variation Calculator
Paste a data set to find the CV, the standard deviation as a percent of the mean, for comparing spread.
Five Number Summary Calculator
Paste a data set to get the minimum, first quartile, median, third quartile and maximum at a glance.
Interquartile Range Calculator
Paste a data set to find the IQR along with the first and third quartiles and the median in one step.
Outlier Detector (1.5 IQR)
Free outlier detector using the 1.5 IQR rule. Paste a data set to find outliers, the fence boundaries and the clean values that remain.
Geometric Mean Calculator
Paste positive numbers to find their geometric mean, the right average for growth rates, ratios and returns.
Harmonic Mean Calculator
Paste positive numbers to find their harmonic mean, the correct average for rates like speed and price ratios.
Weighted Mean Calculator
Enter values and their weights to find the weighted average, where more important items count for more.
Normal Distribution Calculator
Enter a value, mean and standard deviation to find the probability density and cumulative probability.
Binomial Probability Calculator
Enter trials, successes and success probability to find exact, at most and at least binomial probabilities.
Poisson Probability Calculator
Enter an average rate and a count to find exact, at most and at least Poisson probabilities for rare events.
Relative Frequency Calculator
Paste category counts to build a frequency table with relative and cumulative frequencies as percentages.
Gaming
Category page →
Mouse Sensitivity Converter
Convert mouse sensitivity between games using cm/360 and DPI. Match your aim across CS2, Valorant, Apex and more instantly in your browser.
eDPI Calculator
Calculate your eDPI (effective DPI) from mouse DPI and in game sensitivity. Compare true aim speed across setups instantly in your browser.
cm/360 Calculator
Calculate cm/360, the mouse distance for a full turn, from DPI, sensitivity and game yaw. Dial in your aim distance instantly in your browser.
Game FOV Converter
Convert field of view between horizontal, vertical and aspect ratios. Match FOV across games and monitors instantly in your browser.
FPS to Frame Time Calculator
Convert FPS to frame time in milliseconds and back. See how many ms each frame takes and the frametime budget for smooth gameplay.
K/D Ratio Calculator
Calculate your kill death ratio from total kills and deaths. See your K/D and how many kills you need to reach a target instantly in your browser.
KDA Calculator
Calculate KDA (kills plus assists divided by deaths) for MOBA and shooter games. See your KDA score instantly in your browser.
Win Rate Calculator
Calculate your win rate from wins and losses, and see how many games you must win to hit a target percentage. Fast and private in your browser.
Headshot Percentage Calculator
Calculate your headshot percentage from headshots and total kills. Track aim precision across sessions instantly and privately in your browser.
Gacha Pull Probability Calculator
Calculate the chance of pulling at least one target unit over N gacha pulls. Uses correct at least one probability math, private in your browser.
Loot Drop Probability Calculator
Calculate the chance of getting a rare drop at least once over N kills or runs. Correct probability math, runs privately in your browser.
XP to Level Calculator
Calculate total XP needed to reach a target level and how much you still need. Supports linear and scaling curves, private in your browser.
DPS Calculator
Calculate damage per second from hit damage, fire rate, crit chance and crit multiplier. Compare weapon builds instantly and privately in your browser.
APM Calculator
Calculate actions per minute (APM) from total actions and match duration. Measure your speed in RTS and strategy games privately in your browser.
Steam Sale Price Calculator
Calculate the final price of a game after a Steam style discount, plus your total savings and cost for a bundle of titles. Private in your browser.
Elo Rating Calculator
Calculate new Elo ratings after a match from both player ratings, the result and a K factor. See rating change and expected score in your browser.
Chess Rating Change Calculator
Estimate your chess rating change across a tournament from your rating, opponents and results. Uses expected score math, private in your browser.
Gacha Pity Calculator
Track how many gacha pulls until pity and the currency needed. Enter pity count, current pulls and cost to plan your next banner in your browser.
Game Resolution Scaler
Calculate render resolution from a resolution scale percentage, plus total pixels and pixel count change. Tune performance instantly in your browser.
Controller Deadzone Calculator
Calculate the effective usable stick range after a controller deadzone and see remapped output at any raw input. Runs privately in your browser.
Aim Reaction Benchmark
Test your reaction time by clicking the moment the box turns green. Get your best, average and a gamer rating over five tries in your browser.
Tickrate Reference and Calculator
Look up server tickrate values and convert tickrate to milliseconds per tick. See how tick timing affects hit registration, private in your browser.
Sports
Category page →
Golf Handicap Calculator
Enter your recent score differentials and get your handicap index using the World Handicap System average method.
Golf Score Differential Calculator
Turn an adjusted gross score, course rating and slope into a WHS differential in one click.
Bowling Score Calculator
Enter your rolls frame by frame and get a running score with correct strike and spare bonuses.
Baseball ERA Calculator
Enter earned runs and innings pitched to get a pitcher earned run average using the standard nine inning formula.
Batting Average Calculator
Divide hits by at bats to get a three digit average, plus a quick read on where it ranks.
Slugging Percentage Calculator
Enter singles, doubles, triples and home runs against at bats to get SLG and total bases.
On Base Percentage Calculator
Enter hits, walks, hit by pitch and plate appearances to get on base percentage the correct way.
OPS Calculator
Add on base percentage and slugging percentage to get OPS, the popular all in one offensive rating.
NFL Passer Rating Calculator
Enter completions, attempts, yards, touchdowns and interceptions for the official quarterback rating.
Fantasy Football Points Calculator
Enter yards, touchdowns and turnovers to score a player in standard, half PPR or full PPR.
Basketball Shooting Percentage Calculator
Get field goal, three point, free throw, effective and true shooting percentages from your makes and attempts.
Points Per Game Calculator
Divide total points by games played to get a per game scoring average for any sport, plus a season projection.
Wilks Score Calculator
Enter bodyweight and total lifted to get a Wilks score that compares strength across weight classes.
DOTS Score Calculator
Enter bodyweight and total to get a DOTS coefficient score, the modern replacement for Wilks.
Barbell Plate Loading Calculator
Enter a target weight and bar weight to see exactly which plates to load on each side of the bar.
Darts Checkout Calculator
Enter your remaining score in 501 and see a valid three dart finish that ends correctly on a double.
Cycling Power to Weight Calculator
Divide your FTP by body weight to get watts per kilogram and see your rider category.
Swimming Pace Calculator
Enter a swim time and distance to get your pace per 100 meters or 100 yards plus average speed.
40 Yard Dash Speed Calculator
Convert a forty time into average miles per hour and kilometers per hour to see your sprint speed.
Vertical Jump Power Calculator
Enter jump height and body weight to estimate peak leg power in watts.
Marathon Split Calculator
Enter a goal finish time to get even and negative split pacing for every 5K and the half marathon mark.
Race Split Time Calculator
Enter a target finish time and race distance to get an even pace and the clock time at every split.
Weather
Category page →
Heat Index Calculator
Enter air temperature and relative humidity to find how hot it really feels.
Wind Chill Calculator
Enter temperature and wind speed to find the wind chill temperature.
Dew Point Calculator
Enter temperature and relative humidity to find the dew point and comfort level.
Feels Like Temperature Calculator
Combines heat index in warm weather and wind chill in cold weather to show the real apparent temperature.
Relative Humidity Calculator
Enter air temperature and dew point to find the relative humidity using saturation vapor pressure ratios.
Absolute Humidity Calculator
Enter temperature and relative humidity to find grams of water vapor per cubic meter of air.
Wet Bulb Temperature Calculator
Enter air temperature and relative humidity to find the wet bulb temperature.
Wet Bulb Globe Temperature Calculator
Free WBGT calculator estimating outdoor wet bulb globe temperature from air temperature, humidity and sun to gauge heat stress risk zones.
Cloud Base Height Calculator
Enter surface temperature and dew point to estimate the height of cumulus cloud bases.
Snow to Water Ratio Calculator
Convert snowfall depth to liquid water equivalent, or water to snow, using the ratio for your snow type.
Beaufort Wind Scale Reference
Enter a wind speed to find its Beaufort force number, name and the sea and land effects that go with it.
Saffir-Simpson Hurricane Scale Reference
Enter sustained wind speed to find the hurricane category and its expected damage.
Air Density Calculator
Enter temperature, pressure and humidity to find moist air density in kilograms per cubic meter.
Frost Point Calculator
Enter temperature and relative humidity to find the frost point, the temperature at which frost forms on surfaces.
Rainfall Volume Calculator
Enter rainfall depth and a roof or catchment area to find the total water volume collected in liters and gallons.
Growing Degree Days Calculator
Enter daily high and low temperatures and a base temperature to find GDD accumulation for crop growth.
Pressure Altitude Calculator
Enter field elevation and the altimeter setting to find pressure altitude for aviation performance planning.
Density Altitude Calculator
Enter pressure altitude and temperature to find density altitude and gauge aircraft and engine performance loss.
UV Index Reference and Burn Time
Enter the UV index and your skin type to see the risk level, protection advice and estimated time to sunburn.
Humidex Calculator
Enter air temperature and dew point to find the humidex and how hot it feels with humidity.
Lightning Distance Calculator
Enter the seconds between a lightning flash and thunder to find how far away the storm is and if it is a threat.
Pets
Category page →
Dog Age by Breed Size Calculator
Convert dog years to human years with a size adjusted model instead of the naive times seven rule.
Puppy Adult Weight Predictor
Estimate how big your puppy will grow from its current age and weight using a simple growth ratio method.
Dog Calorie Calculator (RER and MER)
Work out daily calories for your dog from resting energy needs and an activity factor using the standard RER and MER method.
Cat Calorie Calculator (RER and MER)
Estimate daily calories for your cat from resting energy needs and a life stage factor using the RER and MER method.
Dog Food Portion Calculator
Turn your dog daily calorie needs and the food calories per cup into a daily cup and gram feeding amount.
Cat Food Portion Calculator
Convert your cat daily calorie needs and the food calories per can or cup into a clear daily feeding amount.
Dog Water Intake Calculator
Estimate how much water your dog should drink per day from its body weight using a common ml per kg guideline.
Dog Chocolate Toxicity Calculator
Estimate the theobromine dose from the chocolate type and amount your dog ate against common risk thresholds.
Dog Pregnancy Due Date Calculator
Estimate your dog whelping due date and week by week timeline from the breeding date using a 63 day gestation.
Cat Pregnancy Due Date Calculator
Estimate your cat queening due date and key milestones from the mating date using a 65 day feline gestation.
Aquarium Volume Calculator
Find the water volume of a rectangular fish tank in litres and gallons from its length, width, and height.
Fish Tank Stocking Calculator
Estimate how many fish a tank can hold with the classic inch per gallon guide and a safer adjusted figure.
Horse Age to Human Years Calculator
Convert your horse age into human years with a staged model that reflects fast early growth and slower later aging.
Rabbit Age to Human Years Calculator
Convert your rabbit age into human years with a staged model that reflects fast maturing youth and a long adult phase.
Dog Crate Size Calculator
Get recommended crate length and height from your dog body measurements so it can stand, turn, and lie down.
Cat Litter Usage Calculator
Estimate how much litter you use per month and the yearly cost from your number of cats and change routine.
Dog Walking Distance Calculator
Estimate a daily walk distance and time target for your dog based on its energy level, age band, and body weight.
Pet Sitting Cost Calculator
Estimate the total price of pet sitting or boarding from the daily rate, number of days, pets, and extra visits.
Dog Body Condition Score Estimator
Answer quick rib, waist, and belly questions to estimate a 1 to 9 body condition score and weight status.
Pet Medication Dosing Schedule Planner
Turn a start time and dosing interval into a clear list of dose times across the next day or two.
Fashion & Sizing
Category page →
International Shoe Size Converter
Enter one size and see every equivalent instantly in your browser.
Foot Length to Shoe Size
Measure your foot in cm or inches and get accurate US, UK and EU shoe sizes for men and women.
Clothing Size Converter
Translate alpha sizes like S, M and L into US, UK and EU numeric sizes with one selection.
Ring Size Converter
Enter one and see every equivalent ring size measurement instantly.
Ring Size from Circumference
Wrap a strip of paper around your finger, enter the circumference or diameter, and get your US, UK and EU ring size.
Bra Size Calculator
Enter your underbust and bust measurements to find your band and cup size using the standard inch difference method.
Bra Size Converter
Enter a band and cup and see the matching label in every regional system.
Hat Size Calculator
Measure your head circumference in cm or inches and get your US, UK, EU and alpha hat size instantly.
Glove Size Calculator
Measure your hand circumference and get your numeric glove size plus an S to XL alpha size for men and women.
Belt Size Calculator
Enter your pant waist or actual waist measurement and get the correct belt size in inches and centimeters.
Jeans Size Calculator
Convert your waist and inseam measurements into US W/L jeans sizing and equivalent EU and alpha sizes.
Men's Shirt Size Calculator
Enter your neck and sleeve measurements to get the correct collar size and sleeve length fit.
Suit Jacket Size Calculator
Enter your chest measurement and height to get your jacket size and short, regular or long length.
Kids Clothing Size by Age
Enter a child age to see the typical US, UK and EU clothing size plus average height and weight.
Kids Shoe Size by Age
Enter a child age to see the typical US, UK and EU shoe size and the matching foot length in cm.
Sock Size Converter
Turn your US shoe size into the numeric sock size and an S to XL alpha size for men and women.
Watch Band Size Calculator
Enter your wrist circumference to find the recommended strap length and typical S, M or L band size.
Necklace Length Guide
Enter a chain length in inches or centimeters and see where it sits and the traditional style name.
Waist to Pant Size Converter
Turn a waist measurement into US, UK and EU pant sizes and an S to XL alpha size for men and women.
Dress Size Converter
Enter one dress size and see every international equivalent instantly.
International Size Chart Reference
Quick reference tables for womens and mens tops, waist and shoes across US, UK and EU sizing.
Photography
Category page →
Depth of Field Calculator
Calculate the depth of field for any lens from focal length, aperture, subject distance, and sensor size. See near, far, and total sharp zone.
Hyperfocal Distance Calculator
Find the hyperfocal distance for any lens and aperture. Focus there to keep everything from half that distance to infinity acceptably sharp.
Crop Factor Calculator
Convert a lens focal length to its full frame equivalent using your camera crop factor. Compare APS-C, Micro Four Thirds, and more.
Equivalent Aperture Calculator
Convert an aperture to its full frame equivalent for depth of field and light gathering across sensor sizes. Compare lenses fairly.
Field of View Calculator
Calculate the angle of view of any lens from focal length and sensor size. See horizontal, vertical, and diagonal field of view in degrees.
Exposure Value (EV) Calculator
Calculate the exposure value from aperture, shutter speed, and ISO. Convert between EV, light value, and camera settings for any scene.
Sunny 16 Rule Calculator
Apply the Sunny 16 rule to find shutter speed and aperture for any lighting from your ISO. Meter-free daylight exposure made simple.
Flash Guide Number Calculator
Calculate flash aperture, distance, or guide number for correct exposure. Solve any of the three from the other two in meters or feet.
Print Size and DPI Calculator
Find the largest quality print size from your image pixels and target DPI, or the DPI you get at a chosen print size. Inches and cm.
Megapixel to Print Size Calculator
See the largest print size your camera megapixels support at 150, 200, and 300 DPI. Turn a megapixel count into real print dimensions.
Star Photography 500 Rule Calculator
Find the longest shutter speed before stars blur using the 500 and NPF rules from focal length and sensor. Sharp astrophotography.
Time Lapse Calculator
Plan a time lapse: find clip length, frame count, interval, or shooting time from the others. Includes storage size and card estimate.
ND Filter Calculator
Calculate the new shutter speed after adding a neutral density filter. Enter base shutter and ND stops to get long exposure times.
Bellows Extension Factor Calculator
Calculate the exposure compensation in stops for macro and bellows extension from focal length and total lens extension. Fix dark macro shots.
Reciprocal Shutter Rule Calculator
Find the slowest handheld shutter speed that avoids blur using the reciprocal rule from focal length, sensor, and image stabilization.
Photo File Size Estimator
Estimate RAW and uncompressed image file size from megapixels and bit depth, plus JPEG sizes and how many fit on a memory card.
Stops of Light Calculator
Convert changes in aperture, shutter speed, or ISO into stops of light and back. Understand equivalent exposures and stop differences.
ISO Invariance and Noise Reference
Understand ISO invariance, when to raise ISO versus brighten in post, and how ISO, noise, and dynamic range interact on modern sensors.
Golden Hour and Blue Hour Guide
Learn when golden hour and blue hour happen relative to sunrise and sunset, with a planner that estimates the windows from your sun times.
Diffraction Limit Calculator
Find the aperture where diffraction starts to soften your images based on sensor and pixel size. Know the sharpest f-stop to use.
Motion Blur Shutter Speed Calculator
Find the shutter speed to freeze or intentionally blur a moving subject from its speed, distance, and direction across the frame.
Color Temperature and White Balance Reference
Look up the color temperature in Kelvin for common light sources and match the right white balance preset for accurate photo colors.
Astronomy
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Telescope Magnification Calculator
Divide telescope focal length by eyepiece focal length to find power, plus your maximum useful magnification from aperture.
Telescope Focal Ratio Calculator
Find the f-number of a telescope from focal length and aperture, or solve for the focal length needed to hit a target f-ratio.
Telescope Resolving Power Calculator
Find the Dawes and Rayleigh limits in arcseconds from your aperture to judge the finest double star split your scope can show.
Telescope Exit Pupil Calculator
Find the exit pupil in millimeters from aperture and magnification, or from eyepiece focal length and focal ratio, to match your eye.
CCD Pixel Scale Calculator
Find arcseconds per pixel from your camera pixel size and telescope focal length to check if you are matched to seeing.
Angular Size Calculator
Find how large an object appears in the sky in degrees, arcminutes and arcseconds from its true diameter and distance, or solve for size.
Escape Velocity Calculator
Find the speed needed to escape a planet, moon or star from its mass and radius using the square root of two GM over r.
Orbital Period Calculator
Find how long a satellite or moon takes to orbit a body from the central mass and orbit radius using Newton form of Kepler third law.
Kepler Third Law Calculator
Convert between orbital period in years and semi-major axis in astronomical units where P squared equals a cubed.
Schwarzschild Radius Calculator
Find the event horizon size of a black hole from its mass using two GM over c squared, in meters, kilometers and solar masses.
Redshift Velocity Calculator
Convert a spectral redshift z into recession velocity using both the simple Doppler and relativistic formulas, in km/s and fraction of light.
Absolute Magnitude Calculator
Convert between apparent and absolute magnitude using the distance modulus, and solve for distance in parsecs and light years.
Star Brightness Ratio Calculator
Convert a magnitude difference between two stars into how many times brighter one is using the Pogson ratio of 2.512.
Light Travel Time Calculator
Find how long light takes to cross a distance and convert light years, light minutes and light seconds into kilometers and miles.
Parsec to Light Year Converter
Convert between parsecs, light years, astronomical units and kilometers for astronomical distances, both directions instantly.
Telescope Limiting Magnitude Calculator
Estimate the faintest star your telescope can show from its aperture, so you know what deep sky targets are within reach.
Planet Orbital Speed Calculator
Find how fast a planet moves around the Sun from its orbital radius using the vis-viva circular speed formula, in km/s and mph.
Surface Gravity Calculator
Find the gravitational acceleration at the surface of a planet, moon or star from its mass and radius using g equals GM over r squared.
Wien Law Peak Wavelength Calculator
Find the peak emission wavelength of a star or blackbody from its temperature, and see the color band it falls in, using the displacement law.
Stellar Luminosity Calculator
Find a star total energy output from its radius and surface temperature with the Stefan-Boltzmann law, in watts and solar luminosities.
Baby & Pregnancy
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Baby Weight Percentile Calculator
Enter age, sex and weight to see your infant weight-for-age percentile from birth to 24 months.
Baby Height Percentile Calculator
Enter age, sex and length to see your infant length-for-age percentile up to 24 months.
Baby Head Circumference Percentile Calculator
Enter age, sex and head circumference to see the head-circumference-for-age percentile.
Pregnancy Weight Gain Calculator
Enter pre-pregnancy BMI and week to see your recommended total and weekly weight gain range.
Conception Date Calculator
Estimate the likely date of conception from your last menstrual period, due date or an ultrasound based gestational age.
Baby Feeding Amount Calculator
Estimate how many ounces of formula or milk your baby needs per feeding and per day based on weight and age.
Baby Formula Mixing Calculator
Work out how many scoops of powder and how much water you need for a target bottle size at the standard 1 scoop per 2 ounces ratio.
Diaper Cost Calculator
Estimate how much you will spend on diapers per week, month and per year based on daily changes and price per diaper.
Childcare Cost Calculator
Estimate weekly, monthly and yearly daycare or nanny costs and see how much of your take-home pay childcare uses.
Baby Sleep Schedule Calculator
Enter your baby age and wake time to see age appropriate wake windows, suggested nap times and total daily sleep.
Contraction Timer
Tap to start and stop each contraction to track duration, frequency and the interval between contractions in real time.
Baby Kick Counter
Tap each time you feel your baby move and time how long it takes to reach ten kicks, a common fetal movement tracking method.
Breast Milk Storage Guide
See how long expressed breast milk stays safe at room temperature, in the fridge and in the freezer with dated use-by times.
Baby Eye Color Predictor
Enter both parents eye colors to see estimated odds your baby will have brown, blue or green eyes based on simplified genetics.
Chinese Gender Predictor
Enter mother birth date and conception month to see the chart prediction, for fun.
Due Date From Ultrasound Calculator
Enter the scan date and the measured gestational age in weeks and days to get your estimated due date and current progress.
Baby Shower Budget Calculator
Enter guest count and per person spend on food, decor, favors and venue to see your total baby shower cost and cost per guest.
Adjusted Age Calculator for Preemies
Enter birth date and weeks early to find your preemie adjusted age used for tracking milestones and growth.
Baby Clothing Size by Weight
Enter your baby weight and height to see the matching newborn, 0-3, 3-6 and 6-9 month clothing size.
Baby Food Introduction Age Guide
Enter your baby age in months to see which first foods and textures are commonly introduced at each stage of starting solids.
Betting & Odds
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Betting Odds Converter
Convert American (moneyline), decimal, fractional and implied probability odds between all four formats instantly in your browser.
Implied Probability Calculator
Turn American, decimal or fractional odds into the break even win probability the price is offering.
Parlay Calculator
Combine up to eight legs in American or decimal odds to get the total parlay odds, payout and combined win probability.
Kelly Criterion Calculator
Find the optimal bet size as a percentage of your bankroll from your win probability and the decimal or American odds.
Betting Expected Value Calculator
Enter your true win probability, the odds and your stake to see the EV in dollars and whether the bet is +EV.
Arbitrage Betting Calculator
Enter two opposing odds to check if a sure bet exists, then get the optimal stake split and guaranteed profit.
Hedge Bet Calculator
Work out the exact stake to place on the other side to lock in a guaranteed profit or cut your loss on an open wager.
Moneyline Payout Calculator
Enter American moneyline odds and your stake to see the exact profit and total return on a winning bet.
Over Under Payout Calculator
Enter a total, the sides odds and your stake to see if a game total goes over or under and what your bet pays.
Betting Bankroll Management Calculator
Set your bankroll and unit percentage to size flat bets and see how many units survive a losing streak.
Vig Calculator
Enter both sides of a two way market to find the sportsbook vig, the total overround and each sides fair no vig probability.
No Vig Fair Odds Calculator
Strip the sportsbook margin from a two way market to get each sides true fair odds and no vig win probability.
Sportsbook Hold Percentage Calculator
Enter both sides of a market to find the sportsbook theoretical hold, the share of every dollar wagered the book keeps.
Break Even Win Rate Calculator
Find the win percentage you need to break even at any odds, and see your ROI at a target win rate.
Round Robin Bet Calculator
Turn your picks into every parlay combination of a chosen size, with total number of bets, cost and max payout.
Teaser Bet Calculator
Move the spread or total in your favor across multiple legs, apply the teaser odds and see the adjusted lines and payout.
Each Way Bet Calculator
Enter fractional odds, place terms and stake to see the win and place returns of an each way horse racing or golf bet.
Poker Pot Odds Calculator
Enter the pot size and the bet to call to get your pot odds as a ratio and the break even equity you need to call.
Poker Outs and Hand Odds Calculator
Enter your number of outs to get the odds of hitting your draw on the turn, the river and by the river in Texas Holdem.
Betting Unit Size Calculator
Convert a bankroll and unit percentage into a dollar unit, then price any bet in units to keep staking consistent.
Electronics
Category page →
LED Resistor Calculator
Enter supply voltage, LED forward voltage and current to get the exact resistor value, nearest E12 size and power rating.
LED Series and Parallel Array Calculator
Design series and parallel LED strings for a given supply voltage, with per-string resistor values, total current and layout advice.
Resistors in Parallel Calculator
Enter any number of resistor values and get the total equivalent resistance using the reciprocal parallel formula instantly.
Resistors in Series Calculator
Add any list of resistor values in ohms and get the total series resistance instantly, since series resistors simply add up.
Capacitors in Parallel and Series Calculator
Enter capacitor values and choose series or parallel to get the total capacitance, using the correct add or reciprocal rule.
RC Time Constant Calculator
Enter resistance and capacitance to get tau, the 63 percent charge time and the time to reach 5 tau or full charge.
LC Resonant Frequency Calculator
Enter inductance and capacitance to get the resonant frequency of a tuned tank circuit using f = 1 / (2 pi sqrt(LC)).
NE555 Timer Calculator
Enter resistors and capacitor to get frequency, period, duty cycle or one shot pulse width.
Wire Gauge AWG Calculator
Convert American Wire Gauge to diameter and cross section area, or find the gauge for a diameter, with metric and imperial output.
Wire Resistance Calculator
Enter length, cross section area and material to get the total resistance of a conductor using resistivity, for copper or aluminium.
Voltage Drop Calculator
Enter length, current, wire cross section and material to get the voltage lost and percentage drop over the cable.
Battery Life Calculator
Enter battery capacity in mAh and device current draw to estimate how many hours or days your battery will last before recharge.
Ampere Hour and Watt Hour Calculator
Convert between ampere hours, watt hours and battery voltage, and work out energy capacity for any battery pack or cell.
Inductive and Capacitive Reactance Calculator
Enter frequency and an inductor or capacitor value to get the inductive or capacitive reactance in ohms for AC circuit design.
Transformer Turns Ratio Calculator
Enter primary and secondary voltages or turns to get the turns ratio, output voltage and reflected current.
PCB Trace Width Calculator
Enter current, copper thickness and allowed temperature rise to get the minimum trace width for internal or external layers.
Watts to Amps Calculator
Enter power in watts and voltage to get the current in amps for DC and single phase AC circuits, with power factor support.
Amps to Watts Calculator
Enter current in amps and voltage to get the power in watts for DC and single phase AC loads, with optional power factor.
dBm to Watts Converter
Convert between dBm, watts and milliwatts for RF and signal power, both directions, using the standard logarithmic relationship.
Solar Panel and Battery Sizing Calculator
Enter daily load, sun hours, system voltage and days of autonomy to size the solar array and battery bank you need.
Current Divider Calculator
Enter total current and two parallel resistors to find how the current splits between each branch using the current divider rule.
Capacitor Energy and Charge Calculator
Enter capacitance and voltage to get the stored energy in joules and the charge in coulombs using E = half C V squared.
Gardening
Category page →
Raised Bed Soil Volume Calculator
Enter bed length, width and fill depth to get the cubic feet, cubic yards and bags of soil to fill a raised garden bed.
Garden Bed Soil Mix Calculator
Split a raised bed fill into compost, topsoil and aeration by percent to see the cubic feet of each ingredient for a balanced blend.
Seed Spacing Calculator
Enter bed size and the spacing between plants and rows to find how many plants fit and how many seeds to sow at your germination rate.
Triangular Plant Spacing Calculator
Compare offset staggered planting versus square grid to fit more plants in the same bed and see the extra plants gained.
Compost Carbon to Nitrogen Ratio Calculator
Enter browns and greens by weight with their carbon to nitrogen ratios to blend a compost pile near the ideal 30:1 target.
Plant Watering Amount Calculator
Enter your garden bed area and target inches of water per week to find gallons needed and how long to run a hose or sprinkler.
Greenhouse Heater Size Calculator
Enter greenhouse dimensions, inside and outside temperatures to find the BTU per hour and watts of heater you need to hold your target.
Square Foot Garden Planner
Enter your grid of one foot squares and a crop to see plants per square and total plants for a Mel Bartholomew style raised bed.
Fertilizer NPK Rate Calculator
Enter your bag analysis, target pounds of nitrogen per 1000 sq ft and area to find pounds of product to apply and the P and K it supplies.
Seed Starting Date Calculator
Enter your last spring frost date and weeks to start indoors to find the exact sow date and transplant date for your seedlings.
Frost Free Planting Date Calculator
Enter your last spring and first fall frost dates to find the safe planting window and the length of your growing season in days.
Vegetable Harvest Yield Estimator
Enter number of plants and expected yield per plant to estimate total harvest in pounds and pounds per square foot of garden bed.
Potting Soil Bag Calculator
Enter pot size and shape and how many pots to fill to find total quarts and bags of potting mix you need.
Rain Barrel Capacity Calculator
Enter your roof catchment area and rainfall to see the gallons a storm collects and how many barrels it takes to store the runoff.
Drip Irrigation Flow Calculator
Enter number of emitters and their flow rate to find total gallons per hour, run time for a watering goal and daily water use.
Soil pH Amendment Calculator
Enter current and target soil pH and bed area to estimate pounds of lime to raise pH or elemental sulfur to lower it.
Tree Spacing Calculator
Enter your plot size and the spacing between trees and rows to find how many fruit or shade trees fit and the trees per acre.
Cover Crop Seed Rate Calculator
Enter your plot area and the seeding rate in pounds per acre or per 1000 sq ft to find the pounds of cover crop seed to buy.
Garden Fence Material Calculator
Enter the perimeter of your garden and post spacing to find the number of posts, gates and total fencing length you need to buy.
Grow Light Coverage Calculator
Enter your grow area and target PPFD or watts per square foot to estimate the light wattage and coverage for seedlings and indoor plants.
Travel
Category page →
Trip Cost Splitter
Enter a total trip cost and number of travelers to see the fair per-person share instantly, all in your browser.
Group Trip Expense Splitter
Enter who paid what, then see who owes whom and the fewest transfers to settle up. Runs in your browser.
Jet Lag Recovery Calculator
Estimate how many days your body needs to adjust after crossing time zones and get direction-based tips.
Layover Time Calculator
Enter your arrival and next departure times to see connection minutes and whether it is a safe layover.
Flight Duration Calculator
Estimate air time from great circle distance and cruise speed, plus taxi and climb buffer for a realistic gate time.
Travel Budget Calculator
Add flights, lodging, food, transport and activities to get your total trip cost and daily spend instantly.
Per Diem Calculator
Enter your daily meal and lodging rates and travel days to total your business trip per diem, with a half-day rule.
Packing List Generator
Pick trip length, climate and trip type to build a custom checklist you can copy, all in your browser.
Baggage Fee Calculator
Add checked bags, overweight and oversize charges per direction to total your airline baggage cost for the trip.
Mileage Reimbursement Calculator
Multiply business miles by your per-mile rate to get the amount owed, with a round-trip option.
Frequent Flyer Mile Value Calculator
Compare a cash fare to points plus fees to see cents per point and whether redeeming is worth it.
Hotel Cost Per Night Splitter
Enter the nightly rate, taxes, nights and guests to get each guest per-night and total room share.
Road Trip Total Cost Calculator
Combine fuel, lodging, food and tolls into one all-in trip cost and a per-person share instantly.
Travel Insurance Cost Estimator
Enter trip cost, traveler age and trip days to estimate a rough premium range before you shop for quotes.
Currency Denomination Planner
Enter a cash amount to see the fewest bills and coins to carry, great for withdrawing money before a trip.
Passport Photo Size Reference
Look up official photo dimensions in mm and inches for major countries before you take or print a photo.
Schengen 90/180 Day Tracker
Enter your entry dates to see days used in the rolling 180 day window and how many stay days remain.
Walking Tour Time Estimator
Enter distance, walking pace and stop time to estimate how long a self-guided walking tour will take.
Drive Time With Stops Calculator
Add driving distance, speed and rest breaks to estimate real arrival time on a long road trip.
Travel Days Countdown
Enter your departure date to see how many days, weeks and weekends are left until your trip begins.
Time to Leave for Airport Calculator
Work back from your flight using check-in, security and drive time to get the exact leave-by time.
Tipping by Country Reference
Look up customary restaurant, taxi and hotel tipping norms for popular destinations before you travel.