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NUTRITION & PHYSIOLOGY
VO₂ Max Estimator v1.0
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.
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.
Changelog:
v1.0 — Initial release. VO2max estimation from race times using the Jack Daniels VDOT method with equivalent performance predictions.