Race Time Predictor
Use your known race result to predict your performance at any distance. Combines three proven formulas for accurate estimates.
Known Race Result
Hours
Minutes
Seconds
Target Distance
Predicted Time
Low confidenceAverage of 3 formulas
3h 53:06
Pace: 5:31 /km · 8:53 /mile
Riegel
3h 50:01
Cameron
3h 59:45
VO2max
3h 49:34
| Distance | Predicted Time | Pace /km | Pace /mile |
|---|---|---|---|
| 5K | 24:06 | 4:49 | 7:45 |
| 10K | 50:00 | 5:00 | 8:03 |
| Half Marathon | 1h 50:55 | 5:15 | 8:28 |
| Marathon | 3h 53:06 | 5:31 | 8:53 |
| 50K | 4h 39:30 | 5:35 | 8:60 |
About these predictions:
- Riegel: Best for similar distances (±25%)
- Cameron: More accurate for longer distances
- VO2max: Based on aerobic capacity estimation
- Predictions are estimates and actual performance depends on many factors
How to predict your race time
Race time prediction uses mathematical formulas to estimate how fast you'll run at a different distance based on a known race result. If you've run a 10K, you can predict your marathon time. The most common formula is the Riegel formula, which accounts for the fact that maintaining the same pace over longer distances becomes progressively harder due to fatigue.
This tool uses three different formulas: Riegel (best for similar distances), Cameron (better for longer distances), and VO2max-based prediction. Use the average as your baseline estimate.
Also check out our VMA Calculator, Pace Calculator and Pace Conversion Table