Race time predictor

Enter one recent race, and we'll predict your finishing time at other distances using the Riegel formula.

Pace unit
Target distances
Your known race result
DistancePredictedActualPace (min/km)
1K4:00-4:00
1 mi6:37-4:07
3K12:48-4:16
5K22:0022:004:24
10K45:52-4:35
15K1:10:30-4:42
10 mi1:15:57-4:43
Half marathon1:41:12-4:48
30K2:26:59-4:54
Marathon3:31:00-5:00
50K4:12:36-5:03

Predictions use the Riegel formula with exponent 1.06. Accuracy drops as the gap between your known race and the target grows, so be skeptical when predicting marathon time from a 5K.

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