About the Cooper Test Calculator
The Cooper test is a simple field test of aerobic fitness: run (or run-walk) as far as you can in exactly 12 minutes, usually on a 400 m track, and record the distance. This calculator converts that distance into an estimated VO2 max using the equation Dr Kenneth Cooper published in 1968, and rates the result against age- and sex-specific standards.
It is used by sports teams, military and police fitness programmes, PE teachers and individual runners who want a cheap, repeatable benchmark instead of a laboratory treadmill test. Repeating the test every 6–8 weeks under similar conditions is a good way to track whether your training is improving your endurance.
Cooper’s original study of 115 US Air Force men found a correlation of about 0.90 between 12-minute distance and treadmill-measured VO2 max. Accuracy depends on even pacing and a maximal effort, so warm up well, run on a flat measured course, and treat the result as an estimate rather than a lab value.
With the default inputs, the estimated vo2 max is 42.4 ml/kg/min. Change any value above to recalculate instantly.
How to use the cooper test calculator
- 1Warm up for 10 minutes, then run as far as you can in exactly 12 minutes on a flat, measured course.
- 2Count laps (400 m each on a standard track) plus the extra metres at the whistle.
- 3Enter the distance and choose metres, kilometres or miles.
- 4Enter your age and sex to see your rating.
- 5Retest every 6–8 weeks under similar conditions to track progress.
Formula and method
Cooper (JAMA, 1968) tested Air Force personnel on both a 12-minute run and a laboratory treadmill and fitted a straight line between the two. The resulting equation estimates VO2 max in millilitres of oxygen per kilogram of body mass per minute from the distance d covered in 12 minutes. Each extra 100 m adds about 2.2 ml/kg/min.
Ratings use the widely published Cooper standards by age band and sex: Excellent, Good, Average, Fair and Poor. A distance on a band boundary is given the higher rating except at the Excellent threshold, which must be exceeded. Because the norms were set decades ago and on broad groups, compare your result mainly with your own previous tests.
- d
- Distance covered in 12 minutes, in metres
- VO₂max
- Maximal oxygen uptake, ml/kg/min
Worked examples
30-year-old man runs 2,400 m
(2400 − 504.9) ÷ 44.73 = 42.4 ml/kg/min. For men aged 30–39, 2,200–2,600 m is rated Good, so 2,400 m is Good, at an average pace of 5:00 per km.
45-year-old woman runs 1.1 miles
1.1 miles is 1,770 m. The equation gives (1770.3 − 504.9) ÷ 44.73 = 28.3 ml/kg/min. For women aged 40–49 the Average band is 1,500–1,799 m.
22-year-old man runs 3,000 m
Covering 3 km in 12 minutes (4:00 per km) gives (3000 − 504.9) ÷ 44.73 = 55.8 ml/kg/min. That beats the 2,800 m Excellent threshold for men aged 20–29.
Frequently asked questions
What is a good Cooper test score?+
For men in their 20s, more than 2,800 m is Excellent and 2,400–2,800 m is Good; for women in their 20s, more than 2,400 m is Excellent and 2,000–2,400 m is Good. Standards drop by about 100 m per decade of age.
How accurate is the Cooper test for VO2 max?+
Cooper reported a correlation of about 0.90 with treadmill VO2 max in fit young men. For an individual, expect an error of several ml/kg/min, more if pacing is poor, the course is not flat, or the runner is not used to hard running.
Can I walk during the Cooper test?+
Yes. The test is simply the furthest distance you can cover in 12 minutes, so run-walking is allowed. A walking-heavy result will produce a low VO2 max estimate, which reflects current endurance rather than a mistake.
Can I do the Cooper test on a treadmill?+
You can, but results are not directly comparable to the track norms. Set a 1% incline to mimic outdoor air resistance, and remember that adjusting speed by button presses makes even pacing harder.
How do I improve my 12-minute run distance?+
Combine plenty of easy aerobic running with one weekly session of 3–5 minute intervals at roughly your 12-minute pace. Retest after 6–8 weeks on the same course and in similar weather so any gain reflects fitness, not conditions.
This tool gives general estimates and is not medical advice. Talk to a doctor or qualified professional about your health, diet or training.