Website Speed Calculator
Estimate how long a page takes to load on different connection speeds from its file size, request count and latency — free, fast and private.
How to use Website Speed Calculator
- Enter the total page size in KB or MB.
- Enter the number of requests and the network latency in ms.
- Pick a connection speed (or enter a custom one).
- Click Calculate to see estimated load times for each connection.
Note: this tool runs in your browser. Nothing is uploaded.
Honest note: This is an ESTIMATE from the numbers you enter. It does not fetch or measure a live website — browsers cannot do that (CORS blocks cross-site fetches). Real load time also depends on scripts, rendering and caching. For an official measurement use Google PageSpeed Insights.
Frequently Asked Questions
Does this calculator test my live site?
No. It estimates load time from the size, requests, latency and connection speed you enter. It never fetches a website.
How is load time estimated?
Download time (file size divided by connection speed) plus latency multiplied by the request round-trips, with a small per-request overhead.
What page size is too big?
Pages over about 2 MB are heavy on mobile. Compressing images is usually the biggest quick win.
Is my data uploaded anywhere?
No. All calculations run in your browser.