session · Interactive tool
Race Time Predictor (Riegel)
Predict your time at any distance from a known performance using Riegel formula.
Interactive Tool
Race Time Predictor (Riegel)
Predict your time at any race distance based on a known performance, using the Riegel formula (validated for 5K to marathon).
Known time
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Predicted times
| Race | Distance | Time | Pace | Speed |
|---|---|---|---|---|
| 1K | 1km | 3:55 | 3:55/km | 15.31 km/h |
| 1mi | 1.609km | 6:29 | 4:01/km | 14.88 km/h |
| 5K | 5km | 21:35 | 4:19/km | 13.90 km/h |
| 10K | 10km | 45:00 | 4:30/km | 13.33 km/h |
| 15K | 15km | 1:09:10 | 4:36/km | 13.01 km/h |
| Half | 21.0975km | 1:39:17 | 4:42/km | 12.75 km/h |
| Full | 42.195km | 3:27:01 | 4:54/km | 12.23 km/h |
Riegel formula: T2 = T1 × (D2/D1)^1.06. Fatigue exponent 1.06 is validated for races from 5K to marathon for typical recreational runners.
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