Free agency tools / Bandwidth Calculator
How much bandwidth will this site use?
Estimate monthly data transfer before you pick a plan or a CDN — from traffic, page weight and how much your cache offloads — with headroom for growth so you don't get a surprise overage bill.
How it works
- 1Enter your monthly visits, pages per visit and average page weight (the total transferred per page).
- 2Set a cache hit rate — the share of requests served from cache instead of your origin — and a growth buffer.
- 3We work out origin bandwidth per month, the daily average and the sustained throughput it implies.
Frequently asked
What counts as 'page weight'?
The total bytes a browser downloads for one page view — HTML, CSS, JS, images and fonts. Check it in your browser's DevTools Network tab or a speed test; 2–4 MB is typical for a modern site.
Why does cache hit rate reduce bandwidth?
A cached request is served from the CDN edge, not your origin server, so it doesn't count against your host's transfer. A higher hit rate means less origin bandwidth for the same traffic.
Is this the number my host bills on?
Roughly — most hosts meter origin egress, which is what this estimates. CDN transfer may be billed separately by the CDN. Always leave headroom; real page weight and traffic vary.
How accurate is it?
It's an estimate for planning, not a guarantee. Uncached asset requests, bots and API traffic can push it up, which is exactly why the growth buffer exists.