Pace calculator
Enter two of distance, time and pace to get the third. Results show pace per kilometre and per mile, speed and race splits.
How the calculation works
Pace, time and distance are linked by one relationship. Know any two and the third follows. The calculator converts everything to kilometres and seconds, solves it, then converts back to the units you chose.
Pace is rounded to the nearest second only when it is displayed. The unrounded value is used for splits, so they do not drift.
pace = time ÷ distance
- pace
- how long it takes to cover one kilometre or mile
- time
- the time you ran, in seconds
- distance
- the distance you ran, in kilometres or miles
Pace chart for common distances
Use these as a quick reference. Pick the row closest to your goal pace, then enter your own distance for exact figures.
| Pace per km | Pace per mile | Speed | 5K | 10K | Half marathon | Marathon |
|---|---|---|---|---|---|---|
| 4:00 | 6:26 | 15.0 km/h | 20:00 | 40:00 | 1:24:23 | 2:48:47 |
| 5:00 | 8:03 | 12.0 km/h | 25:00 | 50:00 | 1:45:29 | 3:30:59 |
| 6:00 | 9:39 | 10.0 km/h | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 |
| 7:00 | 11:16 | 8.6 km/h | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 |
Choosing a realistic pace
Set the target from a recent race or a hard, steady run, not from the pace you wish you could hold. Over a longer distance the same effort gives a slower pace, so a 10K pace is not a half marathon pace. If the result looks too fast or too slow for you, the calculator flags values outside what is humanly plausible so you can check your inputs.
Examples
Frequently asked questions
What pace do I need for a 4-hour marathon?
About 5:41 per kilometre or 9:09 per mile, held evenly over 42.195 km.
How do I convert pace per mile to pace per kilometre?
Divide the pace per mile by 1.609344. For example 8:00 per mile is 4:58 per kilometre. Use the unit selector on the pace field and the calculator shows both.
Does this account for hills, heat or wind?
No. It assumes the same pace from start to finish. Real races are rarely even, so treat the splits as a guide, not a prediction.
What is the difference between pace and speed?
Pace is time per distance (minutes per kilometre). Speed is distance per time (kilometres per hour). Runners usually think in pace, treadmills show speed, and this calculator shows both.
Related calculators
Sources
- World Athletics, Technical Rules – standard road race distances (the marathon is 42.195 km)
- International mile = 1.609344 km, by definition (NIST, Guide for the Use of the International System of Units)