Race times at each pace
Worked out by this calculator (pace × distance):
| Pace | A mile | 5K | 10K | Half marathon | Marathon |
|---|---|---|---|---|---|
| 4:00 a km | 6:26 | 20:00 | 40:00 | 1:24:23 | 2:48:47 |
| 4:30 a km | 7:15 | 22:30 | 45:00 | 1:34:56 | 3:09:53 |
| 5:00 a km | 8:03 | 25:00 | 50:00 | 1:45:29 | 3:30:59 |
| 5:30 a km | 8:51 | 27:30 | 55:00 | 1:56:02 | 3:52:04 |
| 6:00 a km | 9:39 | 30:00 | 1:00:00 | 2:06:35 | 4:13:10 |
| 7:00 a km | 11:16 | 35:00 | 1:10:00 | 2:27:41 | 4:55:22 |
How it’s worked out
A mile is exactly 1.609344 km, so a pace per km × 1.609344 is the pace per mile. A half marathon is 21.0975 km (13.1094 miles) and a marathon 42.195 km (26.2188 miles).
Pace = time ÷ distance Time = pace × distance Speed = distance ÷ time
Estimating other distances
The calculator estimates your times at other races with Peter Riegel’s formula (American Scientist, 1981): time × (new distance ÷ old distance)^1.06. From a 25-minute 5K:
| Race | Estimate |
|---|---|
| 10K | 52:07 |
| Half marathon | 1:55:00 |
| Marathon | 3:59:47 |
It assumes you’ve trained for the longer distance; most people run a first marathon slower than it predicts.
How to read the result
- The headline is the pace, finish time or distance, whichever you asked for.
- Speed and the other unit (per km or per mile) underneath.
- Race times at the same effort: estimates for other distances from Riegel’s formula.
- Splits: the clock time at every kilometre or mile.
Common mistakes
- Typing 5.30 for five and a half minutes: use 5:30.
- Expecting a first marathon to match the estimate from a 5K: it’s usually slower.
- Mixing kilometres and miles: switch units rather than converting by hand.
How to use it
- Choose what to work out: pace, time or distance.
- Type the other two (times as h:mm:ss or mm:ss), or pick a race to fill in its distance.
- Read the pace, speed and splits; switch between metric and imperial at the top.
Questions
What pace is a 25-minute 5K?
5:00 a kilometre, or 8:03 a mile (12 km/h).
What pace do I need for a sub-4-hour marathon?
About 5:41 a kilometre (9:09 a mile): 4 hours is 5:41 a km exactly, so aim a few seconds faster to allow for crowds and corners.
Does it work for cycling?
Yes. The speed in km/h or mph is shown with every answer.
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