Race Time Predictor
Predict your 5K, 10K, half or marathon time from a recent race.
Runs in your browser — nothing is uploaded—
Details
Informational estimates only — not medical or training advice.
How to use Race Time Predictor
- Enter your values — the unit for each field is shown next to it.
- The result updates instantly as you type.
- Copy the results, or change inputs to compare scenarios.
Formula & assumptions
T₂ = T₁ × (D₂ / D₁)^1.06