🫁 VO2 Max Estimator (Cooper Test)

Run as far as you can in 12 minutes, then enter the distance covered to estimate your VO2 max using the well-established Cooper test formula.

Distance Covered in 12 Minutes

Unit

Cooper's 1968 regression

Kenneth Cooper fitted one straight line between distance covered in twelve minutes and oxygen uptake measured in a lab. That line is the whole model:

VO2max (ml/kg/min) = (metres in 12 minutes - 504.9) / 44.73

Cover 2400 m and the estimate is (2400 - 504.9) / 44.73 = 42.4 ml/kg/min. Miles are converted at 1609.344 m first, so 1.5 miles is 2414 m and reads 42.7. Every extra 44.73 m buys one more point, which is about 4 seconds of running at that speed - so the difference between 42 and 45 is one lap of a track.

Running the test properly

It is a maximal effort. Twelve minutes flat out, ideally on a 400 m track so the distance is exact. Warm up first; going out too hard is the usual reason the number comes back low.
Pace judgement is being measured too. A fitter runner who fades badly can score below a fitter-pacing rival with less capacity.
Repeat under the same conditions. Wind, heat and surface all move the result, so the trend matters more than one figure.

Be clear about the error. This is a field estimate with a typical spread of 10-15% against laboratory gas analysis, and Cooper derived it from young male Air Force personnel, so it fits older, less trained or female runners less well. The Below Average to Elite labels ignore age and sex - a 42 is unremarkable at 25 and strong at 60. A maximal test is a genuine cardiovascular load: this is general information, not medical advice, and if you have heart or lung concerns get cleared before running it.

Frequently asked questions

How far do you have to run in 12 minutes for a VO2 max of 50?

2741 m, about 1.70 miles - just under seven laps of a track, which means holding 1:45 per 400 m for the full twelve minutes.

Is the Cooper test accurate?

Accurate enough to track your own progress, not accurate enough to compare against someone else's lab number. Running economy varies between people by more than the test can see.

What is a good VO2 max?

For untrained adults 35-45 is typical, trained endurance athletes reach 55-70, and elite distance runners are measured above 75. It also falls by roughly 10% per decade after 30 without training.