Running Pace Calculator
Calculate pace per mile and per kilometer from any distance and finish time, with 5K/10K/half/marathon split projections.
Result
Pace
5:00/km · 8:03/mi
Speed: 12.00 km/h · 7.46 mph.
- Total time0h 25m 0s
- Distance (km)5.000
- Distance (mi)3.107
- 5K projection25:00
- 10K projection50:00
- Half projection1:45:29
- Marathon projection3:30:59
Step-by-step
- Convert to total seconds: 0×3600 + 25×60 + 0 = 1500 s.
- Convert distance to km: 5.0000 km.
- Pace per km = 1500 ÷ 5.0000 = 300.00 s/km = 5:00/km.
- Project to half-marathon: 5:00/km × 21.0975 km = 1:45:29.
How to use this calculator
- Enter your distance in km, miles, or meters.
- Enter the finish time as hours/minutes/seconds.
- Read pace per km and per mile, plus race-distance projections.
About this calculator
Pace is just total time divided by distance, but small differences matter — a 10-second-per-km change is the difference between a 4:14 and a 4:21 marathon. The projections assume you can hold the same pace at longer distances, which gets less true as the race lengthens. For more accurate predictions for half and full marathons, use the Riegel race-time-predictor below.
Frequently asked
Linear pace projection assumes you can hold the same pace, but in reality everyone slows down at longer distances. The Riegel formula (in the race-time-predictor calculator) accounts for this with an exponent of 1.06.
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