Running Pace Calculator
Enter the distance you ran and your time (hours, minutes, seconds) to instantly get your pace per kilometer (min'sec"/km) and speed (km/h). Also shows predicted times for 5K, 10K, half, and full marathon at the same pace.
Input
Distance run
km
Time taken
h
min
sec
Result
Pace per km
5'00"/km
Speed
12.00 km/h
Per km
5'00"
Distance
10.0 km
Predicted times at this pace
| Distance | Predicted time |
|---|---|
| 1km | 5:00 |
| 5km | 25:00 |
| 10km | 50:00 |
| Half marathon | 1:45:29 |
| Full marathon | 3:30:59 |
How it works
- Pace (seconds per km) is calculated as total time in seconds divided by distance in km. The result is shown in m'ss"/km format (for example, 5'00"/km), with seconds rounded to the nearest whole number.
- Speed (km/h) is distance in km divided by the total time in hours, i.e. distanceKm / (totalSeconds / 3600).
- Time is entered in separate hour, minute, and second fields and combined as totalSeconds = hours * 3600 + minutes * 60 + seconds. A result is shown only when the distance is greater than 0 and no more than 1000 km and the time is at least 1 second.
- The predicted-time table keeps the same pace (seconds per km) and computes the total time for 1 km, 5 km, 10 km, a half marathon (21.0975 km), and a full marathon (42.195 km) as paceSecPerKm * distanceKm. Times of one hour or more are shown as h:mm:ss, and shorter times as m:ss.
- These figures are calculated estimates only. Your actual race times will vary with weather, course elevation, fitness, and fatigue.
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Running Pace Calculator