VO2 Max Calculator (Cooper Test)

The Cooper test is a simple field fitness test: run or jog as far as possible in exactly 12 minutes on a flat, measured track or course, then measure the total distance covered. It was developed by Dr. Kenneth Cooper in 1968 for the US Air Force and remains one of the most widely used non-laboratory VO2 max estimation methods.

VO2 max (ml/kg/min) = (distance in meters − 504.9) ÷ 44.73. This regression formula was derived by correlating Cooper test distances against laboratory-measured VO2 max values across a large sample of test subjects.

Field tests like the Cooper test are estimates, typically within about 10-15% of true laboratory-measured VO2 max (which requires breathing-gas analysis equipment during a graded treadmill test) — useful for tracking your own fitness trend over time, but not a clinical-grade measurement.

The categories (Poor, Below average, Average, Good, Excellent) are general population benchmarks, not adjusted for age or sex — competitive endurance athletes often score well above 55 ml/kg/min "Excellent," while these thresholds give an average adult a reasonable sense of where their aerobic fitness currently stands.