Running Pace Calculator
Fill in any two of distance, time and pace; the third is computed. Race distances are preset.
Pace per km
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Pace per mile
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Average speed
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Marathon at this pace
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Worked example
10 km in 50 minutes is 5:00 per kilometre, 8:03 per mile, 12 km/h — and a marathon of 3:30:59 if that pace could be held.
Pace is time divided by distance, and it does not scale linearly across distances. Most runners slow by 3–8% going from 10 km to a marathon; the projection here is pace held constant, which is an upper bound rather than a forecast.
Pace versus speed
Pace is minutes per unit of distance; speed is distance per hour. They are reciprocals, so improving from 5:00 to 4:30 per kilometre is a bigger gain than the numbers suggest.