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Running Pace Calculator
Work out pace, time or distance, see splits, and predict 5K, 10K, half and full marathon times.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Running Pace Calculator works
Pace is time divided by distance. Race predictions use the Riegel formula T2 = T1 x (D2 / D1)^1.06.
Output: CSV.
How to use Running Pace Calculator
- Pick what to work out: pace, time or distance.
- Enter the other two.
- Read splits and race predictions.
- Download the splits.
Tips
- Most watches can export FIT files from their app or website.
- Health files reveal a lot about you. Here they never leave your device.
- These tools give training information, not medical advice.
Running Pace Calculator FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
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