Race Time Predictor (Riegel Formula)

Enter values
(km)
km
(min)
min
(km)
km
Result
Result
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Next steps
Marathon Time Predictor Estimate your marathon finish time from a recent half-marathon performance using Riegel's formula. VDOT Calculator (Jack Daniels) Estimate running fitness (VDOT) from race performance using Jack Daniels's Running Formula equations. Age-Graded Running Performance Calculator Express any race result as a percentage of a reference standard using the WMA ratio formula. Continue in Guided Mode Run any calculator step by step. Your values carry across every tool in the session.

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