Running Pace Calculator: Pace, Time, Speed

Running pace calculator

Short answer

Pace is time divided by distance. A 25:00 5K is 5:00 per km, or 8:03 per mile, which is 12.0 km/h (7.46 mph). Enter a time for any distance to get your pace, or a pace to get your finish time and splits.

Last reviewed 27 October 20262 published sourcesNot medical advice

Reps keeps track of this for you on iPhone, iPad and Apple Watch.

Get Reps free

Running pace calculator

Work out your pace from a finish time, or a finish time from a pace.

Enter a distance and a time or pace.

Runs entirely in your browser. Nothing you type is saved or sent anywhere.

Finish times by pace
Pace	5K	10K	Half marathon	Marathon
4:00 /km (6:26 /mi)	20:00	40:00	1:24:23	2:48:47
4:30 /km (7:15 /mi)	22:30	45:00	1:34:56	3:09:53
5:00 /km (8:03 /mi)	25:00	50:00	1:45:29	3:30:59
5:30 /km (8:51 /mi)	27:30	55:00	1:56:02	3:52:04
6:00 /km (9:39 /mi)	30:00	1:00:00	2:06:35	4:13:10
6:30 /km (10:28 /mi)	32:30	1:05:00	2:17:08	4:34:16
7:00 /km (11:16 /mi)	35:00	1:10:00	2:27:41	4:55:22

Pace

10K

Half marathon

Marathon

4:00 /km (6:26 /mi)

20:00

40:00

1:24:23

2:48:47

4:30 /km (7:15 /mi)

22:30

45:00

1:34:56

3:09:53

5:00 /km (8:03 /mi)

25:00

50:00

1:45:29

3:30:59

5:30 /km (8:51 /mi)

27:30

55:00

1:56:02

3:52:04

6:00 /km (9:39 /mi)

30:00

1:00:00

2:06:35

4:13:10

6:30 /km (10:28 /mi)

32:30

1:05:00

2:17:08

4:34:16

7:00 /km (11:16 /mi)

35:00

1:10:00

2:27:41

4:55:22

How hard is that pace?

The 2024 Compendium of Physical Activities lists measured energy costs for running at set speeds, from 8.5 METs at 5 mph (12 minutes per mile) to 18.5 METs at 12 mph (Herrmann et al., 2024 (Compendium)). The calculator shows the nearest entry for your speed; turn it into calories with the calories burned calculator.

Your pace at one distance doesn't carry straight over to a longer one, because you slow as distance grows. Riegel described that slowdown as a power law (Riegel, 1981); the race time predictor uses it to forecast your other race times.

Common questions

How do I convert pace per km to pace per mile?

Multiply by 1.609344, the number of kilometres in a mile. A 5:00 per km pace is 8:03 per mile. To go the other way, divide by 1.609344.

What pace is a 2-hour half marathon?

5:41 per km or 9:09 per mile, held for all 21.1 km.

What pace is a 4-hour marathon?

5:41 per km or 9:09 per mile over 42.195 km.

Sources

Figures on this page were checked against these publications on 27 October 2026.

Herrmann SD, Willis EA, Ainsworth BE, Barreira TV, Hastert M, Kracht CL, et al. 2024 Adult Compendium of Physical Activities: a third update of the energy costs of human activities. Journal of Sport and Health Science. 2024;13(1):6–12. doi.org/10.1016/j.jshs.2023.10.010

Riegel PS. Athletic records and human endurance. American Scientist. 1981;69(3):285–290. www.jstor.org/stable/27850427

Running pace calculator