Running pace calculator
Pace, finish time and speed — for any distance.
Output
Enter your finish time, e.g. 50:00 or 1:45:30.
Your files stay on your device
This tool runs entirely in your browser. What you paste is processed on your device and is never sent to a server, so it is safe to use with tokens, keys and unpublished text.
Example
Example: the pace per mile for a two-hour half marathon
A runner training for a fall half marathon wants to finish in two hours and asks what that means a mile, on the course and on the treadmill. Choose Half marathon, Miles and “Pace from a finish time”, and type 2:00:00.
- Pace is the time divided by 13.109 miles (21.0975 km): 9:09 per mile, 5:41 per km. The speed is 6.6 mph, 10.5 km/h, the treadmill setting.
- The splits list every mile: 27:28 at 3 miles, 54:55 at 6, 1:31:32 at 10 and 1:59:00 at 13; the last 0.109 mile ends at 2:00:00.
- Typed as just 1:59, the time is read as hours and minutes, and the result says so: 9:05 per mile for a 1:59:00 finish.
| Predicted from 2:00:00 | Time | Pace per mile |
|---|---|---|
| 5 km | 26:05 | 8:24 |
| 10 km | 54:23 | 8:45 |
| Half marathon | 2:00:00 | 9:09 |
| Marathon | 4:10:12 | 9:33 |
Holding 9:09 a mile brings the runner in at 2:00:00, and 9:05 leaves a minute in hand. The predictions use Riegel’s formula: a 26:05 5K is about the same fitness, while the 4:10:12 marathon assumes training for 26.2 miles.
How it works
- Choose the distance — 5K, 10K, half marathon, marathon, a mile or your own — and kilometres or miles.
- Enter a finish time to get your pace, or a pace to get your finish time.
- Read the pace per km and per mile, the speed for a treadmill, the split for every km or mile, and predicted times for the other distances.
Frequently asked questions
- How is pace calculated?
- Pace is time divided by distance: 50 minutes for 10 km is 5:00 per kilometre, 8:03 per mile, which is 12.0 km/h on a treadmill.
- How do I type the time?
- As on a watch: 50:00, 1:45:30 or 3:29:59 — or 1h45. A time like “1:45” for a half marathon is read as hours and minutes, and the result says so.
- How are the predicted times worked out?
- With Riegel’s formula, which runners have used since 1977: T2 = T1 × (D2 ÷ D1)^1.06. It is a guide — a marathon prediction assumes you have trained for the distance.
- What pace do I need for a sub-4 marathon?
- Choose Marathon, “Finish time from a pace”, and try 5:40 per km: it gives 3:59:06. Splits show where you should be at each kilometre.
- What pace is a 30-minute 5K?
- 9:39 per mile, or 6:00 per km: 6.2 mph (10.0 km/h) on a treadmill. Choose 5K and “Pace from a finish time” and type 30:00; from the same run the predicted 10K is 1:02:33.
- What treadmill speed is a 10-minute mile?
- 6.0 mph, or 9.7 km/h. Choose “Finish time from a pace”, Miles, and type 10:00: a 5K at that pace takes 31:04, with splits of 10:00, 20:00 and 30:00 at each mile.
- Is anything saved?
- No. It is calculated in your browser.
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