Estimate only, not medical advice.
Kenneth Cooper, an Air Force physician, published the 12-minute run test in 1968 as a field-friendly stand-in for lab oxygen testing: run as far as you can in 12 minutes, all-out, then plug the distance into his regression formula, VO2max = (meters minus 504.9) divided by 44.73. It won't match a lab test exactly, but it needs nothing more than a track and a stopwatch.
Warm up first, since starting cold both hurts performance and raises injury risk on an all-out effort. Pace it like a race rather than sprinting the first lap; runners who go out too hard tend to fade hard in the final minutes and underestimate their real fitness.
| VO2 max (ml/kg/min) | Level |
|---|---|
| Below 25 | Low |
| 25 to 35 | Fair |
| 35 to 45 | Good |
| 45 to 55 | Excellent |
| 55 and above | Elite |
Same thresholds the calculator above uses to label your result; competitive endurance athletes often measure well above this range.
That's the protocol Kenneth Cooper published in 1968: run as far as possible in exactly 12 minutes, then convert the distance into an estimated VO2 max using his regression formula. Shorter or longer test windows use different formulas, not this one.
Yes, as long as you can push the pace up as you go rather than locking in one speed. Track the total distance the display shows after 12 minutes and enter it here.
A lab test with a mask and gas analyzer measures oxygen use directly and is more accurate. The Cooper test estimates the same number from performance alone, which trades some accuracy for something you can do on any track.
It's a ceiling on how much oxygen your muscles can use, which sets an upper bound on aerobic performance. Two runners with the same VO2 max can still race very differently based on pacing, running economy and how much of that ceiling they can sustain.