CalcVitalsVO2 Max Calculator — Cooper & Rockport Tests
The Cooper test turns 12 minutes of running into a VO2 max: covering 2,400 m gives a VO2 max of about 42.4 ml/kg/min — a solidly fit figure for most adults. The one-mile Rockport walk test on this page estimates the same quantity from a brisk walk, for those not running yet.
How it works
VO2 max — the maximum rate at which your body can use oxygen during hard exercise — is the single best laboratory predictor of endurance performance and, in large cohort studies, one of the strongest predictors of long-term health outcomes, outranking many classic risk factors. The lab version involves a mask and a treadmill ramp; the field tests here estimate it from performances anyone can do.
Kenneth Cooper devised the 12-minute run in 1968 for the US Air Force: cover as much ground as you can, and the distance maps closely onto measured VO2 max. The Rockport test trades intensity for accessibility — walk a mile as fast as you can, and your time plus finishing heart rate, age, weight and sex reconstruct the estimate. It was designed for people for whom a maximal run is not yet sensible, and its accuracy in that population is respectable.
Whatever your number, its trajectory matters more than its level: VO2 max responds to training at almost any age, with typical gains of 15–20% over a few months of consistent aerobic work, and each 1 ml/kg/min improvement is associated with measurably lower mortality risk in the cohort data. Retest every couple of months under the same conditions and watch the line, not the point.
The method
Cooper (1968): VO2 max = (distance in metres − 504.9) ÷ 44.73. Rockport (Kline et al., 1987): VO2 max = 132.853 − 0.0769·weight(lb) − 0.3877·age + 6.315·(male) − 3.2649·walk time(min) − 0.1565·finishing HR.
Frequently asked questions
What is a good VO2 max for my age?
It declines about 10% per decade after 30. Roughly: a man of 30 at 42–46 is good, a woman of 30 at 38–42 is good; by 60, figures near 30 (men) and 26 (women) are respectable. The categories beside your result are age-blind, so read them kindly at 60 and strictly at 25.
My watch gives a different VO2 max. Who is right?
Watches estimate from submaximal heart-rate and pace data with proprietary models — often within a few points of field tests. All three are estimates of a lab number; agreement within ±4 between any of them is normal.
How fast can VO2 max improve?
Untrained people often gain 15–20% in 3–6 months of progressive aerobic training. The ceiling is heavily genetic; the improvement from wherever you start is not.