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Race Time Predictor (Riegel Formula)

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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 a race result using the Daniels-Gilbert 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. Meal Planner Build a day of meals from a 300-food pantry and watch calories and macros land against your targets. Workout Planner Build a 7-day training week from 160+ exercises and see weekly hard sets per muscle against your volume target.

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