How accurate is a VO₂ max field estimate?

Field formulas such as the Cooper 12-minute run, resting heart-rate methods, and timed 1.5-mile runs can track fitness trends, but they typically differ from laboratory gas-analysis VO₂ max. Treat the number as an educational estimate.

Which calculator method should I use?

Use Cooper or the 1.5-mile run if you can complete a hard continuous effort safely. Use the resting heart-rate (Uth–Sørensen) method when a maximal run is not appropriate. Compare like with like over time.

Do I need an account?

No. The calculator runs in your browser. Optional preferences may be stored in localStorage on your device only.

Main tool

VO₂ max calculator

Choose a method, enter your data, and get a live estimate in ml/kg/min — plus an approximate fitness category and optional heart-rate zones.

Age

Sex (for category bands) Used only for Cooper-style category tables.

12-minute distance (metres)

Formula: (metres − 504.9) / 44.73

Results update as you type. Preferences can stay in localStorage on this device only.

Field estimate ≠ lab gas analysis. Use these numbers to track training trends. Do not treat them as a medical test or diagnosis.

Method notes: Cooper how-to · What VO₂ max means · VO₂ max & longevity · Treadmill vs bike · Category bands follow commonly published Cooper Institute–style norms (educational approximation).