Cooper test: VO2max calculator from a 12-minute run
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The Cooper test is the oldest and simplest running fitness test: you run as far as you can in 12 minutes, and the distance gives an estimate of aerobic capacity. Anyone who has taken a fitness exam for the army, the police or a sports college knows it. This calculator works out VO2max with the original formula, shows the category from the paper the test was born in, and lets you convert the result into training paces.
Embed this calculator on your site
Copy the code and paste it into a blog post or your club page. The calculator runs in a frame, and the link below it leads to the full version with sources.
<iframe src="https://easytrackly.app/en/embed/cooper-test" title="Cooper test and VO2max" width="100%" height="760" style="border:0;max-width:48rem" loading="lazy"></iframe>
<p><a href="https://easytrackly.app/en/running-calculator/cooper-test">EasyTrackly running calculator</a></p>How to run the test
A running track is best, because you read the distance from lines and markers rather than from GPS, which can be 50 metres off over 12 minutes. After a 15-minute warm-up with a few strides you set off at an even pace you can hold for the full 12 minutes. The most common mistake is starting too fast: the crisis comes after four minutes and the result is worse than with an even run. A good reference is your pace from a recent 3K race, or slightly faster than 5K pace. Repeat the test every 8 to 12 weeks, in similar conditions and at a similar time of day.
Where the formula comes from
Kenneth Cooper published the test in 1968 in JAMA. He tested 115 men from the United States Air Force aged 17 to 52: each ran the field test and had aerobic capacity measured on a treadmill with analysis of expired air. The correlation between distance and measured VO2max was 0.897, very high for a field test. The calculator's formula comes from that relationship: subtract 504.9 from the distance in metres and divide by 44.73.
The categories from "very poor" to "excellent" also come from that paper and apply only to that group: middle-aged men, mostly non-athletes. Norms for women and age groups were published later in Cooper's books and tables, which cannot be traced to a single study, so the calculator does not show them.
What the result means
Aerobic capacity says how much oxygen per kilogram of body mass the body can use in a minute at maximal effort. It is one of the three pillars of distance running performance, alongside the lactate threshold and running economy, and the one hardest to improve after a few years of training. The Cooper estimate carries the error of the distance measurement, the weather and your motivation, so treat it as a number to compare with yourself in a few months, not with a table on the internet.
From the result to training pace
Twelve minutes of hard running is a proper time trial, just like a race. The button under the result carries the distance and time to the training paces page, where the Daniels and Gilbert equations turn them into easy, threshold, interval and repetition pace. That is a more practical use of the test than the VO2max figure itself.
Frequently asked questions
Can I do the Cooper test on a treadmill?
You can, but the result is not comparable with a run on a track: no air resistance and an even pace imposed by the belt usually give a slightly better distance. Compare only tests done the same way.
What does a "good" category mean for a forty-year-old woman?
Nothing certain. The categories in the calculator come from a study of men and take no account of sex or age. A better measure of progress is your own distance from a few months ago.
Does my watch calculate VO2max the same way?
No. Watches estimate aerobic capacity from the relationship between heart rate and pace on ordinary runs, with the manufacturer's own algorithm. The Cooper test is one hard effort and a published formula.
How often should I repeat the test?
Every 8 to 12 weeks, at the start of a new training block. More often makes no sense, because capacity changes slowly and the test is a hard session.
Sources
- Cooper K. H., A means of assessing maximal oxygen intake. Correlation between field and treadmill testing, JAMA, 1968. The formula, the 0.897 correlation and the categories for 115 men.
- Daniels J., Gilbert J., Oxygen Power: Performance Tables for Distance Runners, 1979. The equations the training paces page uses to convert the test result.