VO2 Max Calculator

VO2 max is the size of your aerobic engine, the maximum amount of oxygen your body can use during hard exercise. A lab test is the gold standard, but you do not need one to get a useful estimate. The calculator above uses the Cooper test, a simple 12-minute run that has been validated for decades.

How to run the test

Find a track or a flat, measured route. Warm up properly. Then run as far as you can in 12 minutes at a hard, even, sustainable effort. The goal is the greatest distance covered, so pace it like a time trial rather than sprinting early and fading. Note the distance in metres and enter it above.

The calculator converts that distance into an estimated VO2 max in millilitres of oxygen per kilogram of body weight per minute, the standard unit. It also gives you a rough category so you can see where you sit.

What the number means

Higher is better, but context matters. VO2 max declines gently with age and varies with genetics, so the most useful comparison is against your own past results, not against someone else. A rising VO2 max over a training block is clear evidence your aerobic work is paying off.

Treat the Cooper estimate as a ballpark. It depends on you pacing the test well and running on a fair surface. Repeat it under the same conditions each time and the trend will be reliable even if the absolute number is approximate.

How to actually raise it

VO2 max responds to two things: a large aerobic base and targeted high-intensity work. The base comes from lots of easy Zone 2 volume. The ceiling comes from intervals run near your VO2 max, typically repeats of three to five minutes hard with equal or slightly shorter recovery. Together they lift both the floor and the roof of your fitness.

For exactly how to structure that hard work without burying yourself, read the VO2 max intervals guide.