Running Pace Calculator
Enter a distance and a finish time to get your pace per kilometre and per mile, your speed and even splits. You can also switch it round: enter a pace and a distance to get a finish time.
Free, no sign-up. What you enter stays in your browser: it is not saved or sent to HerFound. Reviewed .
What do you want to work out?
Enter your finish time to see your pace.
How it works
Pace is time divided by distance. A 5K in 25 minutes is 25 ÷ 5 = 5 minutes per kilometre. To go the other way, finish time = pace × distance.
One mile is 1.609344 kilometres, so pace per mile = pace per kilometre × 1.609344. Speed is distance divided by time: 5 km in 25 minutes is 12 km/h, or about 7.5 mph.
The race distances are the official ones: 5 km, 10 km, 21.0975 km for a half marathon and 42.195 km for a marathon. Splits assume an even pace, so each one is the pace multiplied by the distance covered so far.
What it cannot tell you
- It assumes you run at the same pace from start to finish. Hills, heat, wind, crowds and tiredness all change your pace during a real run.
- It does not predict what you can run. It only converts between distance, time and pace. A pace you hold for 5K is usually faster than one you can hold for a marathon.
- GPS watches often measure a race a little long, because you rarely run the shortest line. Your watch pace and your official pace can differ by a few seconds.
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Common questions
To calculate running pace, divide your time by your distance. If you ran 10 km in 60 minutes, your pace is 60 ÷ 10 = 6 minutes per kilometre. Multiply by 1.609 to get pace per mile, which here is about 9 minutes 39 seconds.
A 30 minute 5K needs a pace of 6:00 per kilometre, which is 9:39 per mile. That is a speed of 10 km/h or 6.2 mph.
A 2 hour half marathon is a pace of 5:41 per kilometre, or 9:09 per mile. The half marathon distance is 21.0975 km (13.1 miles), so you need to average about 10.5 km/h.
A 4 hour marathon is a pace of 5:41 per kilometre, or 9:09 per mile. The marathon distance is 42.195 km (26.2 miles), so a 4 hour marathon is the same pace as a 2 hour half marathon, held for twice as long.
To convert pace per mile to pace per kilometre, divide by 1.609344. A 10:00 mile is 600 seconds ÷ 1.609344 = 373 seconds, which is 6:13 per kilometre. To go from kilometres to miles, multiply instead.