Race Time Predictor

Predict your 5K, 10K, half or marathon time from a recent race.

Runs in your browser — nothing is uploaded

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Informational estimates only — not medical or training advice.

How to use Race Time Predictor

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

T₂ = T₁ × (D₂ / D₁)^1.06