Race Time Predictor (Riegel Formula)
Known Distance (km)
Finish Time (MM:SS or H:MM:SS)
A marathon time predictor estimates your 42.2 km finishing time from a shorter race result using Riegel's formula, which accounts for increased physiological fatigue over longer distances.
- 1Riegel's formula: T₂ = T₁ × (D₂/D₁)^1.06
- 2The 1.06 exponent accounts for fatigue
- 3Marathon = 42.195 km
- 4Train to match predicted pace for success
10K time: 45:00=Marathon prediction ≈ 3:34:00
| 10K time | Half marathon | Marathon prediction |
|---|---|---|
| 40:00 | 1:28 | 3:05 |
| 45:00 | 1:40 | 3:34 |
| 50:00 | 1:51 | 3:59 |
| 55:00 | 2:02 | 4:24 |
| 60:00 | 2:14 | 4:49 |
References
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