Clinical tools designed for emergency & primary care.
90+ free medical calculators following internationally recognized guidelines (WHO, NICE, ACOG, and consensus groups). Fast, accurate, and entirely privacy-focused.
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Drug-dose resources
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Vitamin tools
35
Clinical guides
⭐ Featured Tools
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Fast, accurate, and clinically validated tools used by doctors every day.
💉 Rabies PEP Scheduler
Calculate vaccination dates (Days 0, 3, 7, 28) and RIG dose by body weight based on current international guidelines. Covers wound categories I–III.
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Popular clinical tools
Cardiology
Mean Arterial Pressure(MAP) Calculator
Free MAP calculator. Calculate mean arterial pressure from systolic and diastolic blood pressure instantly. Includes normal MAP range, clinical interpretation, and shock thresholds. Used by doctors and nurses worldwide.
Clinical Calculator
BMI Calculator India
Free BMI calculator for India. Check your BMI using Asian/Indian specific cutoffs (overweight ≥23, obese ≥25). Includes waist circumference risk and WHO comparison.
Renal
Creatinine Clearance (Cockcroft-Gault)
Free Cockcroft-Gault creatinine clearance calculator for drug dosing. Supports mg/dL and µmol/L. Ideal for antibiotics, DOACs, and chemotherapy dose adjustments.
Clinical Calculator
Ideal Body Weight(IBW) Calculator
Free ideal body weight calculator using Devine, Robinson, Miller and Hamwi formulas. Includes adjusted body weight (AdjBW) for obese patients, drug dosing guide, and ventilator tidal volume calculation. Used by doctors and pharmacists worldwide.
Emergency & Critical Care
NEWS2 Early Warning Calculator
Free NEWS2 score calculator for emergency & ward care: Assess acute illness risk in seconds. Includes interpretation, escalation guidelines, & offline use.
Cardiology
ASCVD 10-Year Risk Calculator
Free ASCVD 10-year cardiovascular risk calculator using the AHA/ACC 2013 Pooled Cohort Equations. Calculate risk for atherosclerotic cardiovascular disease including heart attack and stroke. Includes statin therapy recommendations, lifestyle advice, and risk reduction strategies. Used by cardiologists and general physicians worldwide.
Clinical Calculator
APACHE II Score Calculator
Free APACHE II (Acute Physiology and Chronic Health Evaluation II) score calculator for ICU mortality prediction. Calculate score from 12 acute physiology variables, age, and chronic health points. Includes ICU mortality percentage and management guidance. Used by intensivists and critical care physicians worldwide.
Renal
eGFR Calculator
Free eGFR calculator using CKD-EPI 2021, Cockcroft-Gault (CrCl), and MDRD formulas. Supports mg/dL and µmol/L. Instant CKD staging G1–G5. Used by doctors, medical students, and nurses.
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IV Drip Rate Calculator
Calculate drops/min and mL/hr right here on the homepage. No need to open another page. Supports standard macro sets (15 gtts/mL) and paediatric micro sets (60 gtts/mL).
💧 IV Drip Rate Calculator
Drops/min · mL/hr · Try it right here
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Emergency & Critical Care
8 toolsCURB-65 Calculator
Pneumonia severity score with 30-day mortality risk and BTS-guideline admission decisions for CAP.
NEWS2 Calculator
National Early Warning Score 2 — SpO₂ Scale 1 & 2, ACVPU, with RCP clinical response thresholds.
GCS Calculator
Glasgow Coma Scale for adults and paediatric patients (Adelaide scale). Supports intubated T modifier and TBI severity.
Burn & Parkland Calculator
Rule of Nines TBSA estimation with 24-hour Parkland formula fluid resuscitation plan. Adult and paediatric.
Wells Score — DVT & PE
Pre-test probability for DVT and Pulmonary Embolism with NICE-guideline D-Dimer and imaging pathways.
Anion Gap Calculator
Anion gap with albumin correction. Identify high-AG vs normal-AG metabolic acidosis and delta-delta ratio.
Mentzer Index Calculator
Differentiate beta thalassemia from iron deficiency anaemia using MCV and RBC count. 90%+ accuracy.
MAP Calculator
Mean arterial pressure from SBP and DBP. SSC 2021 sepsis targets, shock thresholds, cerebral perfusion pressure.
Paediatrics & Neonatology
8 toolsNeonatal Jaundice Calculator
Phototherapy thresholds for newborns ≥35 weeks by age-in-hours. AAP 2022 & related parameters.
Pediatric Asthma Action Plan
Green/Yellow/Red zone guide for child asthma. Medication actions, emergency signs, WhatsApp sharing.
Immunisation Tracker
Comprehensive timeline tracker tools for childhood immunization parameters from birth to 16 years.
Child Growth Chart
Weight, height, BMI and head circumference Z-scores with SAM/MAM/stunting classification. WHO 0–5 yrs.
Child Milestones Tracker
Check developmental milestones by age — speech, motor, social skills. Identify delays with red flag alerts.
Paracetamol Dose Calculator
Exact dose by weight (15mg/kg) or age. Syrup volumes for standard clinical concentrations.
ORS Rehydration Calculator
Exact ORS volumes for mild and moderate dehydration by weight. Zinc dose, ORS prep guide.
APGAR Score Calculator
Interactive newborn assessment at 1, 5, and 10 minutes. NRP 2020 resuscitation guide included.
General Medicine & Dosing
12 toolsDrug Dose Calculator
Weight-based doses for antibiotics, antipyretics and emergency drugs. Custom drug concentrations.
ARV Dose Calculator
Anti-Rabies Vaccine — wound category, RIG dose by weight (HRIG/ERIG), Essen IM and intradermal schedules.
IV Drip Rate Calculator
mL/hr, drops/min, infusion time. Macro, micro, and burette drip sets supported.
BMI Calculator
BMI metrics suite offering toggles between global standard definitions and localized risk threshold matrices.
eGFR Calculator
CKD-EPI 2021 equation. CKD staging, dose adjustment flags, and nephrology referral thresholds.
HbA1c Converter
Convert HbA1c between % (NGSP) and mmol/mol (IFCC). eAG and diabetes control algorithms.
Corrected Calcium
Adjust serum calcium for hypoalbuminaemia. Identifies hypo/hypercalcaemia masked by low albumin.
Child-Pugh Score
Liver disease severity — Class A, B, C with 1-year and 2-year survival estimates. Surgical risk guidance.
IBW Calculator
Ideal body weight — Devine, Robinson, Miller, Hamwi formulas. ARDSNet tidal volume. Drug dosing reference.
Creatinine Clearance (CrCl)
Cockcroft-Gault with CKD staging. Auto dose adjustment parameters for high-risk critical clear medications.
PHQ-9 & GAD-7 Screener
Validated depression and anxiety screening. NICE-guideline management. Item 9 suicidality alert included.
CHA₂DS₂-VASc Score
Stroke risk stratification in AFib. Annual stroke risk % and anticoagulation recommendations.
Obstetrics & Gynaecology
2 toolsObsCalc — Obstetric Suite
10 obstetric tools — gestational age, EFW Hadlock, Bishop score, Apgar, GDM dates, VBAC eligibility and PPH risk.
Due Date Calculator
Pregnancy due date from LMP, IVF transfer or ultrasound. Week-by-week milestones, scan reminders.
Occupational Health
2 toolsSpirometry Predicted Values
FEV₁, FVC, FEV₁/FVC and PEFR predicted values using standard reference equations. Classify obstructive, restrictive and mixed defects.
Biomedical Waste Guide
Search 76+ waste items. Instant colour-code matrix parsing with recommended segregation and safe disposal tracking notes.
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Cardiology
Cardiovascular risk scores, haemodynamics, ECG and cardiac assessment tools.
Explore →Emergency & Critical Care
Rapid bedside scores, emergency assessments, resuscitation and critical care tools.
Explore →Obstetrics & Gynaecology
Pregnancy, gestational age, fetal assessment and women’s health calculators.
Explore →Paediatrics
Child growth, development, dosing, neonatal and paediatric assessment tools.
Explore →Renal
Kidney function, fluid management, electrolyte and renal dosing calculators.
Explore →Respiratory
Respiratory function, oxygenation, acid-base and pulmonary assessment tools.
Explore →Clinical Calculators
General clinical scores, laboratory calculations and point-of-care assessment tools.
Explore →📋 Built Against
Guideline References
RxMedCalc tools are built following recognized international clinical consensus guidelines.
Engineered for International Clinical Guidelines
A unified medical platform built to handle standard global equations along with localized risk stratifications safely.
Adaptive BMI Classifications
Toggle instantly between global WHO classification thresholds and localized parameters (including adjusted ethnic variant metrics) seamlessly.
Validated Exposure Protocols
Calculations follow international standard guidance, including the 4-dose WHO Essen Rabies PEP regimen and accurate, weight-based RIG dose tracking.
Universal Obstetric Metrics
Dating and biometry scoring elements leverage standard Hadlock equations and clinical criteria verified alongside international parameters.
Peer-Reviewed Decision Stratification
Calculators like CURB-65, NEWS2, GCS, and Wells criteria follow consensus definitions from BTS, RCP, and NICE to ensure cross-border accuracy.
Medication reference
Find the right dose faster.
Browse adult and paediatric drug-dose references, formulations, indications and renal-adjustment information.
Explore drug doses →Clinical guides
Understand the numbers, not just the score.
Clinical explainers covering risk scores, bedside assessment, interpretation and practical reference topics.
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Clinically validated tools for doctors and patients. Always free. No login required.
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Disclaimer: Clinical decision support tools for qualified professionals only. Verify calculations independently before patient action.Full Medical Disclaimer →
Clinical reference
Built for speed, clarity and responsible use.
RxMedCalc provides free clinical calculators and reference material for informational and educational use. Always interpret results in the context of the individual patient, local protocols and applicable clinical guidance.
