Free tool · No sign-up

Pace Calculator

Enter any two of distance, time, and pace, and this calculator works out the third — your pace per km and per mile, your finish time, or the distance you covered — plus predicted times for a 5K, 10K, half, and full marathon. It runs entirely in your browser: free, instant, and no sign-up.

Distance

Finish time (h : m : s)

Fill in the two fields above and the calculator works out the third.

Predictions assume you hold the same pace the whole way, so treat them as an even-pace estimate. Runs in your browser — nothing is uploaded.

Frequently asked questions

Divide your total time by the distance. For example, 50 minutes over 10 km is 5:00 per km (50 ÷ 10). Enter your distance and finish time above and the calculator shows your pace per kilometre and per mile instantly.

Multiply your pace by the distance. Switch to 'Find finish time', enter the race distance and your goal pace, and the tool returns the total time — so you can set a realistic target for a 5K, 10K, half, or marathon.

They assume you hold the exact pace you entered for the whole distance, so treat them as an even-pace estimate. Real finish times vary with fatigue, hills, and heat, and most runners slow a little over longer distances.

Yes — it's free with no sign-up, and every calculation runs in your browser, so nothing you enter is uploaded or stored.