The Cooper test is one of the oldest and most widely used field tests for estimating VO2 max — just run as far as you can in 12 minutes. Here's the history, exactly how to do it, the original formula, and a worked example.
The Cooper test is a 12-minute maximal-effort run used to estimate VO2 max from the total distance covered. You run as far as possible in exactly 12 minutes, then plug your distance into a simple formula. It requires no equipment beyond a way to measure distance and time, which is why it remains one of the most widely used field tests for cardiorespiratory fitness more than 55 years after it was developed. If a maximal run isn't appropriate for you, see the Rockport 1-mile walk test — a separate, validated walking-based method — in our VO2 Max Calculator.
Enter your 12-minute distance and get your estimated VO2 max instantly, in metric or imperial units.
Open the VO2 Max Calculator →The test was developed by Dr. Kenneth H. Cooper, a US Air Force physician, and published in the Journal of the American Medical Association in 1968 under the title "A Means of Assessing Maximal Oxygen Intake: Correlation Between Field and Treadmill Testing." Cooper's goal was practical: the US Air Force needed a fitness test that could be administered to large numbers of personnel without individual laboratory equipment. He had 115 Air Force officers and airmen complete both a 12-minute maximal run and a laboratory treadmill VO2 max test, then used the relationship between the two to derive the distance-based formula still used today.
This is Cooper's original regression equation, derived from the relationship between 12-minute run distance and directly measured treadmill VO2 max in his 1968 study (correlation r = 0.90). It uses distance alone — no age, sex, or weight adjustment — because those factors weren't part of the original validation model.
| Step | Calculation | Result |
|---|---|---|
| Distance covered in 12 minutes | — | 2,400 m |
| Subtract 504.9 | 2400 − 504.9 | 1,895.1 |
| Divide by 44.73 | 1895.1 ÷ 44.73 | 42.4 mL/kg/min |
For an imperial example: covering 1.5 miles (2,414 m) in 12 minutes gives VO2max = (2414 − 504.9) ÷ 44.73 ≈ 42.7 mL/kg/min — very close to the metric example above, since the distances are almost identical.
The Cooper 12-minute run is a simple, well-established field test: cover as much distance as possible in 12 minutes, then apply Cooper's 1968 formula to estimate your VO2 max. It requires a genuine maximal effort and pacing skill, and — like any field test — estimates rather than directly measures your aerobic fitness.
What is the Cooper test?
The Cooper test is a 12-minute maximal-effort run developed by Dr. Kenneth Cooper in 1968 to estimate VO2 max from the total distance covered. It was originally developed and validated using US Air Force personnel.
What is the Cooper test VO2 max formula?
VO2max (mL/kg/min) = (distance covered in 12 minutes, in metres, minus 504.9) divided by 44.73. For example, covering 2,400 metres gives an estimated VO2 max of about 42.4 mL/kg/min.
How accurate is the Cooper test?
In Cooper's original 1968 validation against treadmill-measured VO2 max in 115 US Air Force personnel, the correlation was r = 0.90 — a strong but not perfect relationship. It also requires genuine maximal pacing effort, and results can be affected by running experience, pacing strategy, and surface or weather conditions.
Can I walk the Cooper test instead of running?
The original Cooper test was designed and validated as a maximal-effort run. Walking will cover less distance and likely underestimate VO2 max relative to the formula's validation sample. If running isn't appropriate for you, the Rockport 1-mile walk test is a separate, walk-based method validated in its own right — see our VO2 Max Calculator.