Race Time Predictor
Predict times across distances using Riegel's formula.
| Distance | Predicted time | Pace / km |
|---|---|---|
| 5 km | 00:25:00 | 05:00 |
| 10 km | 00:52:07 | 05:12 |
| Half marathon | 01:55:00 | 05:27 |
| Marathon | 03:59:46 | 05:40 |
About this tool
Enter a known race time at a base distance — get predicted times at 5 km, 10 km, half marathon and marathon distances using the Riegel exponent.