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Race Time Predictor

Estimate a finish time from a known race result.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This predictor uses the Riegel formula, T2 = T1 × (D2 ÷ D1)^1.06, to estimate how long you'd take to run a different race distance based on a recent result — the 1.06 exponent accounts for the fact that pace naturally slows over longer distances rather than staying constant.

Runners training for a marathon use a recent 10K or half-marathon time to set a realistic goal pace, and coaches use it to sanity-check whether a target finish time is physiologically reasonable given an athlete's current fitness, rather than just an arbitrary wish.

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