VO2 max — the maximum rate your body can consume oxygen during intense exercise — is the gold-standard measure of aerobic fitness, but properly measuring it requires laboratory breathing-gas equipment. Our VO2 max calculator uses the Cooper 12-minute run test, a well-validated field estimate that only requires a stopwatch and a measured track.
How to take the test
Run or jog as far as possible on a flat, measured track or course for exactly 12 minutes, then note the total distance covered. Enter that distance (in meters) into the calculator.
The formula
VO2 max (ml/kg/min) = (distance in meters − 504.9) ÷ 44.73This regression formula was derived by Dr. Kenneth Cooper in 1968 for the US Air Force, correlating 12-minute test distances against laboratory-measured VO2 max across a large sample.
Example
2,400 meters (a 12-minute run averaging exactly 5:00/km pace):
(2,400 − 504.9) ÷ 44.73 = 42.4 ml/kg/min → "Average" fitness categoryHow accurate is it?
Field tests like this one are estimates — typically within about 10-15% of true laboratory-measured VO2 max. That’s not precise enough for clinical or elite-athlete testing, but it’s more than good enough for tracking your own fitness trend over weeks and months, which is how most people actually use it.
Fitness categories
The built-in categories (Poor, Below average, Average, Good, Excellent) are general population benchmarks, not adjusted for age or sex. Competitive endurance athletes commonly score well above 55 ml/kg/min — use the categories as a general reference point, not a precise ranking against any specific demographic group.