Race Time Predictor

Predict your race time at a new distance from a known race result using the Riegel formula.

Known Race Distance (miles)

Known Race Time (minutes)

Target Distance (miles)

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Predicts your finish time at a new race distance from a known race time and distance, using Pete Riegel's formula T₂ = T₁×(D₂/D₁)^1.06 — a widely used race-time prediction model.