Running Pace Calculator
Work out your pace per km and per mile, plus speed, from distance and time.
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Enter a distance in kilometres and the total time in minutes, and this pace calculator returns your pace per kilometre, pace per mile, and average speed in km/h and mph. Runners use it to analyse a finished run, set a target pace for a race, or translate treadmill speeds into minutes per kilometre.
Entering time in minutes
The Time field takes a single number of minutes, and decimals are allowed, so convert hours and seconds first: total minutes = hours × 60 + minutes + seconds ÷ 60.
- 25 minutes 30 seconds →
25.5 - 52 minutes 45 seconds →
52.75 - 1 hour 45 minutes 30 seconds →
105.5 - 3 hours 59 minutes →
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Official race distances are 5 km, 10 km, 21.0975 km for a half marathon and 42.195 km for a marathon. Enter the full decimals for the longer races, or your pace will come out slightly slow.
The arithmetic
Pace per km is simply minutes ÷ kilometres, displayed as minutes:seconds. For pace per mile the distance is first converted using 1 km = 0.621371 miles. Speed is kilometres ÷ hours, and mph is km/h × 0.621371.
Worked examples
| Run | Pace per km | Pace per mile |
|---|---|---|
| 5 km in 30 min | 6:00 | 9:39 |
| 10 km in 55 min | 5:30 | 8:51 |
| Half marathon in 1:45:30 | 5:00 | 8:03 |
| Marathon in 4:00:00 | 5:41 | 9:09 |
The matching speeds are 10 km/h (6.21 mph), 10.91 km/h, 12 km/h and 10.55 km/h. Notice that a 2-hour half marathon needs exactly the same pace as a 4-hour marathon, about 5:41 per km; the full race just asks you to hold it twice as long.
Using pace to plan a race
- Work backwards from a goal. Enter the race distance and your target finish time to see the pace you must average, then practise that pace in training.
- Leave a small buffer. Certified courses are measured along the shortest possible line, and real runners weave around others and take wider corners, so most people cover a little more than the official distance. Aiming a few seconds per km faster than the calculated pace protects your goal.
- Treadmill conversions. Treadmills show km/h, so 12 km/h is a 5:00 per km pace and 10 km/h is 6:00 per km.
- Train by effort as well as numbers. The heart rate zone calculator helps keep easy runs easy, while the speed, distance and time calculator covers journeys other than runs.
Rounding and display quirks
Seconds are rounded to the nearest whole second. The rounding is applied to the total, so 5 km in 29.98 minutes shows as a clean 6:00 per km. Distances must be entered in kilometres, so multiply miles by 1.609344 before typing them in.