Pace calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Pace = time ÷ distance = 52:30 ÷ 10 km = 5:15 per km.
- 1 mile = 1.609344 km, so the pace per mile is 8:27.
- Finish times assume you hold the same pace over the whole distance.
| Inputs | Answer |
|---|---|
| Distance: 10; Distance unit: Kilometres; Time: hours: 0; minutes: 52; seconds: 30 | Running 10 km in 52:30 is a pace of 5:15 per km (8:27 per mile), 11.43 km/h. |
| Distance: 5; Distance unit: Miles; Time: hours: 0; minutes: 40; seconds: 0 | Running 5 mi in 40:00 is a pace of 4:58 per km (8:00 per mile), 12.07 km/h. |
| Distance: 42.195; Distance unit: Kilometres; Time: hours: 3; minutes: 59; seconds: 0 | Running 42.195 km in 3:59:00 is a pace of 5:40 per km (9:07 per mile), 10.59 km/h. |
How to use it
Pace is time per unit of distance. Running 10 km in 52 minutes 30 seconds is a pace of 5:15 per kilometre (8:27 per mile), a speed of 11.43 km/h. The calculator also projects the same pace over 5 km, 10 km, a half marathon (21.0975 km) and a marathon (42.195 km).
Holding a pace over a longer distance is harder than the arithmetic suggests, so treat the projections as a pacing guide, not a prediction of what you can run.
Frequently asked questions
How do I calculate running pace?
Divide the time by the distance.
What is a 5:15 per km pace in miles?
About 8:27 per mile (multiply by 1.609344).
What pace do I need for a 4-hour marathon?
About 5:41 per km (9:09 per mile).
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
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General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.