NUTRITION & PHYSIOLOGY

VO₂ Max Estimator

Estimate your VO₂ max from a recent race result using the Jack Daniels VDOT formula. Select a distance, enter your finishing time, and see your estimated aerobic capacity, fitness classification, and equivalent race times across all standard distances.

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Methodology — Jack Daniels VDOT

The VDOT model estimates aerobic capacity from race performance:

velocity = distance (m) / time (s)
%VO₂max = 0.8 + 0.1894393 × e^{-0.012778 × t} + 0.2989558 × e^{-0.1932605 × t} (t in minutes)
VO₂ = -4.60 + 0.182258 × v + 0.000104 × v² (v in m/min)
VDOT = VO₂ / %VO₂max

Fitness categories and percentiles are age- and sex-adjusted based on published normative data. Equivalent race times are predicted by finding the time that yields the same VDOT for each distance using bisection search.