Predict your race times across different distances using the scientifically validated Riegel formula. Enter a known performance and see equivalent times for 5K, 10K, half marathon, marathon, and custom distances.
Predicted Time
1h 50m 19s
Equivalent Pace
5:14 /km
Speed
11.47 km/h
5K
23m 59s
4:48 /km
10K
50m 0s
5:00 /km
Half Marathon
1h 50m 19s
5:14 /km
Marathon
3h 50m 1s
5:27 /km
The race time predictor uses the Riegel formula to estimate equivalent performances across different race distances. Based on your known time at one distance, it calculates a predicted time for any other distance. This is a valuable tool for runners setting goals and planning race strategies.