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Bandwidth calculator

Estimate monthly data transfer and the Mbps a site or app needs to serve it.

Input
60
Output
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Bandwidth calculator
Enter your visits, the average pages someone views per visit, and your typical page weight in KB, and this tool works out your monthly data transfer plus the average and peak throughput in Mbps to provision for — the numbers behind picking a hosting plan, sizing a CDN budget, or checking whether a connection can handle a traffic spike.
Period tells the tool what timeframe your visit count covers, so a daily or yearly figure converts to monthly automatically. Peak factor models how much busier your busiest period is than average — a factor of 3 means peak traffic runs three times the average rate, typical for a site with a daily usage curve. Cache hit ratio is the share of requests a CDN or browser cache serves without touching your origin, and protocol overhead adds a percentage for TCP, TLS and HTTP framing on top of raw page weight, so the estimate reflects real wire traffic, not just payload bytes. Recommended reserve adds a fixed 25% of headroom above the computed peak, so ordinary variation does not saturate the link.
Paste a list of URL;size in KB;monthly views lines instead of the three basic fields, and the tool switches to a per-page breakdown: it sums the real transfer per page and ranks the ones costing the most bandwidth, each with its share of the total — more accurate once you have real analytics, and it replaces the visits-based estimate rather than adding to it. Choose GB, TB, GiB or TiB for displayed volumes, and text or table for the result.
Everything runs in your browser; the numbers you enter and any URL list you paste are never uploaded. Copy the result, download it as a .txt file, or send it to another tool's input to keep working with it.
FAQ
How is "monthly transfer" calculated?
It multiplies visits by pageviews per visit by average page size, applies your cache hit ratio and protocol overhead, then converts the period you entered (day, month or year) into a monthly figure.
What does the peak factor mean?
It is how many times busier your peak traffic is than your average traffic. A factor of 3 means the busiest period runs at three times the average throughput — a common rule of thumb for sites with a daily usage pattern.
What happens if I paste a list of pages?
The tool parses each URL;size;views line, computes the real transfer for every page, and replaces the visits/pageviews estimate with the sum of that list — plus a ranking of the heaviest pages by transfer.
Why is there a separate "recommended reserve" number?
Provisioning exactly to your peak leaves no room for an unexpected spike. The reserve adds a fixed 25% of headroom above the computed peak so normal traffic variation does not saturate your connection.
Is my traffic data uploaded anywhere?
No. The calculation, including any per-page list you paste, runs entirely in your browser and is never sent to a server.