VO2 Max Calculator
Estimate your cardiorespiratory fitness (VO2 max) from your resting heart rate or a Cooper 12-minute run test, with a fitness category for your age and sex.
Not medical or coaching advice. This VO2 max calculator gives an estimate only, for general fitness information — it is not medical or coaching advice. If you have a heart condition or are new to intense exercise, speak to a doctor before a maximal-effort fitness test.
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Your estimated VO2 max and fitness category appear here as you type.
How VO2 max is estimated
VO2 max is the maximum amount of oxygen your body can use during intense exercise, measured in millilitres per kilogram of body weight per minute (ml/kg/min) — it's one of the best available markers of cardiovascular fitness. This calculator offers two field-test estimates: the resting heart-rate method (VO2max = 15.3 × maxHR ÷ restingHR, where maxHR = 220 − age), and the Cooper 12-minute run test, which uses the distance you cover in 12 minutes. Neither replaces a lab-measured VO2 max using a treadmill and gas-analysis mask, but both give a useful estimate to track your fitness over time.