Running Pace Calculator
Calculate running pace, finish time or race distance and see split times for any run, free and instant right in your browser.
Enter details
Result
Fill in the fields to see your result.
Estimate only — real results depend on terrain, weather, fatigue, conditions and individual fitness. Not medical or coaching advice.
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the distance you ran or plan to run.
- Enter the time as hours : minutes : seconds.
- Read your pace per km, pace per mile and average speed.
How it works
Pace per km = total time ÷ distance in km. Speed (km/h) = distance ÷ (time in hours). Pace per mile multiplies the per-km pace by 1.609.
Worked example
Half marathon. 21.1 km in 1:45:30 = 5:00 /km (about 12.0 km/h).
Tips
- Times are estimates only — not medical or coaching advice. Always train safely and follow event rules.
- Distances are editable: choose “Custom…” to enter your own course lengths.
Frequently asked questions
Do my details upload anywhere?
No — the calculation runs entirely in your browser.
Pace or speed — which should I use?
Runners usually pace in min/km (or min/mile); speed in km/h is handy for comparing with cycling or a treadmill.
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- Max Heart Rate Calculator
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Cite this tool
Zerdly. (2026). Running Pace Calculator. Retrieved from https://www.zerdly.com/tools/running-pace-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.