Race Predictor
Race Time Predictor
Enter your race times and discover your predicted performances across all distances — plus a personalized athlete profile with training guidance based on your speed-endurance balance.
⚡ 11 distance predictions
🏃 Athlete classification
📚 Training guidance
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Race Time Predictor
By Steve Magness
Your Race Times
Enter 2-3 race results. For best accuracy, bracket your target distance.
Athlete Profile
Fatigue Factor
—
Typical range: 1.03 – 1.20
Classification
—
Endurance
Speed
<1.03
1.03-1.06
1.06-1.10
1.10-1.15
>1.15
Predicted Race Times
| Event | Predicted Time | Status |
|---|
Reference — Fatigue Factor Ranges
| Distance Pair | Mean f | ± Std Dev | n |
|---|---|---|---|
| 400m / 800m | 1.215 | 0.030 | 104 |
| 800m / 1500m | 1.133 | 0.026 | 704 |
| 1500m / 3000m | 1.097 | 0.024 | 631 |
| Mile / 5000m | 1.081 | 0.015 | 269 |
| 3000m / 5000m | 1.063 | 0.026 | 986 |
| 5000m / 10000m | 1.058 | 0.018 | 1319 |
| 10000m / Half | 1.051 | 0.024 | 930 |
| Half / Marathon | 1.076 | 0.026 | 1337 |
| Standard Riegel | 1.060 | n/a | n/a |
