Running pace calculator
This pace calculator turns a distance and a finish time into pace: minutes per kilometre and minutes per mile, plus average speed in km/h and mph.
The split table shows what that pace means for 5K, 10K, a half marathon and a marathon.
Pace
5:30 min/km
Pace
8:51 min/mile
Speed
10.91 km/h
6.78 mph
Split times
| Distance | Time |
|---|---|
| 1 km | 5:30 |
| 5 km | 27:30 |
| 10 km | 55:00 |
| 21.1 km | 1:56:02 |
| 42.2 km | 3:52:04 |
How pace is calculated
Pace is time divided by distance. Speed is the inverse: distance divided by time. Both describe the same run from opposite directions.
- Pace (min/km) = total minutes ÷ distance in kilometres.
- 10 km in 55 minutes: 55 ÷ 10 = 5.5 min/km, that is 5:30 per kilometre.
- Speed (km/h) = distance ÷ time in hours. The same run is 10.9 km/h.
- Pace per mile comes from multiplying pace per kilometre by 1.609.
Race times at common paces
| Pace | 5K | 10K | Half marathon | Marathon |
|---|---|---|---|---|
| 4:00 min/km | 20:00 | 40:00 | 1:24:23 | 2:48:46 |
| 5:00 min/km | 25:00 | 50:00 | 1:45:29 | 3:30:58 |
| 6:00 min/km | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 |
| 7:00 min/km | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 |
| 8:00 min/km | 40:00 | 1:20:00 | 2:48:47 | 5:37:34 |
Why runners track pace
- To spread effort across a long race instead of burning out in the first kilometres.
- To work backwards from a goal finish time to the pace it requires.
- To compare workouts run over different distances.
- To keep easy runs genuinely easy and separate from race pace.
Half marathon and marathon distances
A half marathon is 21.0975 km and a marathon is 42.195 km. The split table uses those exact distances, so the projections match official races rather than rounded 21 and 42 km figures.
Frequently asked questions
How do I calculate running pace?
Divide total minutes by the distance in kilometres. 45 minutes over 9 km gives a pace of 5:00 min/km.
What is the difference between pace and speed?
Pace is time per distance in min/km, speed is distance per hour in km/h. A lower pace number means a higher speed.
What pace do I need for a sub-4-hour marathon?
Around 5:41 min/km, or roughly 9:09 min/mile: 240 minutes divided by 42.195 km.
How do I convert min/km to min/mile?
Multiply the pace per kilometre by 1.609. A 5:00 min/km pace is about 8:03 min/mile.
Does it account for hills or wind?
No. It reports average pace from distance and time. Terrain, heat and wind will change your real splits.
Updated: 2026-08-09