Half marathon pace calculator
Health & fitnessWhat pace do you need for your half marathon goal?
Enter your goal time for the 21.0975 km to get the pace per km and mile and a split for every kilometre.
What you enter stays on your device while you use this tool. Opening a shared link sends the settings in its address to HowToolbox to prepare the page.
Race distances
Your pace
9:09 /mi
21.0975 km in 2:00:00 is a speed of 6.6 mph.
Pace and speed
- Pace per kilometre
- 5:41 /km
- Pace per mile
- 9:09 /mi
- Speed in km/h
- 10.5 km/h
- Speed in mph
- 6.6 mph
At this pace you would run
- 5K
- 28:26
- 10K
- 56:53
- Half marathon
- 2:00:00
- Marathon
- 4:00:00
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Splits at an even pace
Elapsed time at each mark, running the whole distance at the same pace.
| Distance | Elapsed time |
|---|---|
| 1 km | 5:41 |
| 2 km | 11:23 |
| 3 km | 17:04 |
| 4 km | 22:45 |
| 5 km | 28:26 |
| 6 km | 34:08 |
| 7 km | 39:49 |
| 8 km | 45:30 |
| 9 km | 51:11 |
| 10 km | 56:53 |
| 11 km | 1:02:34 |
| 12 km | 1:08:15 |
| 13 km | 1:13:57 |
| 14 km | 1:19:38 |
| 15 km | 1:25:19 |
| 16 km | 1:31:00 |
| 17 km | 1:36:42 |
| 18 km | 1:42:23 |
| 19 km | 1:48:04 |
| 20 km | 1:53:45 |
| 21 km | 1:59:27 |
| 21.0975 km | 2:00:00 |
Enter your goal time for the 21.0975 km to get the pace per km and mile and a split for every kilometre.
How to use
- Choose whether you know your finish time, your pace or your speed.
- Enter the distance (or tap 5K, 10K, half marathon or marathon) and the value you know.
- Read the pace or finish time, the same effort in km and miles, and the time at each mark.
How it works
Pace is how long one kilometre or mile takes you, and speed is how far you go in an hour. They describe the same effort, so one can always be turned into the other. Pace is the favourite of runners, because it tells you what to hold on your watch to reach a goal time.
Pace = time ÷ distance, and speed = distance ÷ time. For example, 10 km in 50 minutes is 50 ÷ 10 = 5:00 per km, which is 10 ÷ (50 ÷ 60) = 12 km/h. A mile is exactly 1.609344 km, so 5:00 per km is about 8:03 per mile. A marathon is 42.195 km and a half marathon is 21.0975 km.
The calculator assumes you hold the same pace the whole way. Real races have hills, wind, a fast start or a slow finish, so treat the splits as a plan to aim for, not a promise. Pace values are rounded to the nearest second.
Worked example
What pace covers 5 km in 30 minutes?
- Pace: 30 ÷ 5 = 6 minutes per kilometre.
The equivalent speed is 10 km/h.
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Frequently asked questions
What pace is a sub-2-hour half marathon?
5:41 per km or 9:09 per mile, held all the way: 5:41 per km gives 1:59:54. Under 1:45 needs 4:58 per km (8:00 per mile) and under 1:30 needs 4:15 per km (6:51 per mile).
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