10K Time Predictor (Riegel)
Predict 10K via Riegel: T₂ = T₁ × (D₂/D₁)^1.06.
Result
Predicted 10K
45:59
Pace 7:24/mi.
- Known race3.1 mi in 22:00
- Predicted 10K45:59
- Pace7:24/mi
Step-by-step
- Riegel: T₂ = T₁ × (D₂/D₁)^1.06.
- T₂ = 1320 × (6.214/3.1)^1.06 = 2,759s.
How to use this calculator
- Enter known race distance + time.
- Read predicted 10K.
About this calculator
Predict 10K race time from a recent shorter or longer race using Riegel's formula. Most accurate when input race is within 2× distance ratio. 5K → 10K is the most reliable prediction (small extrapolation, similar physiology). Marathon → 10K underestimates 10K time (you have more endurance than speed).
Frequently asked
5K result, recent. Half-marathon also works.
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