basic

Race Time Predictor (Riegel)

Predict a new race time from a known race time.

Predict your time for a target race distance from a known time and distance using the Riegel formula T₂ = T₁ · (D₂ / D₁)^1.06.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

m
m

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

T₂ = T₁ · (D₂ / D₁)^1.06

In depth

Predict your time for a target race distance from a known time and distance using the Riegel formula T₂ = T₁ · (D₂ / D₁)^1.06.