The Cooper Test: Estimating VO2 Max From a 12-Minute Run
October 21, 2026
VO₂ max is the maximum rate at which your body can use oxygen during exercise, measured in milliliters of oxygen per kilogram of body weight per minute. It is a standard measure of aerobic fitness and a predictor of endurance performance and long-term health. Laboratory testing is the gold standard, but you can estimate it with a field test. Dr. Kenneth Cooper's 12-minute run is one of the best known: run as far as you can in 12 minutes, and apply a formula.
The formula is VO₂ max ≈ (distance in meters − 504.9) ÷ 44.73. Running 2,400 meters (1.49 miles) in 12 minutes gives (2,400 − 504.9) ÷ 44.73 = 42.4 mL/kg/min.
Skip the math and get your answer instantly:
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Choose a flat, measured course such as a 400-meter track. Warm up for 10 minutes with easy jogging and a few short accelerations. Run for exactly 12 minutes, trying to cover as much distance as possible at an even effort, and note the distance, counting laps and measuring the final partial lap. Cool down afterward with walking.
Perform the test when you are rested and healthy, in mild weather, and avoid doing it right after a big meal. If you have heart disease or risk factors, or are new to vigorous exercise, check with a doctor before attempting an all-out test.
Worked Examples
Apply the formula to your measured distance. 2,000 m gives (2,000 − 504.9) ÷ 44.73 = 33.4. 2,400 m gives 42.4. 2,800 m gives 51.3. 3,000 m gives 55.8. Each additional 100 meters adds about 2.2 mL/kg/min to the estimate.
To convert to miles for planning, 2,400 m is 1.49 miles, equal to a pace of 8:04 per mile for 12 minutes.
| 12-minute distance | Miles | Estimated VO2 max (mL/kg/min) |
|---|---|---|
| 2,000 m | 1.24 | 33.4 |
| 2,400 m | 1.49 | 42.4 |
| 2,800 m | 1.74 | 51.3 |
| 3,000 m | 1.86 | 55.8 |
Interpreting Your Result
Typical VO₂ max values for healthy adults are in the range of about 30 to 45 mL/kg/min for sedentary to moderately active people, with elite endurance athletes above 70. Values decline with age by roughly 5% to 10% per decade after about age 30 in sedentary people, though regular training slows the decline. Ratings differ by age and sex, so compare with published norms for your group.
Some health studies find that low cardiorespiratory fitness is as strong a predictor of mortality as established risk factors, and that moving from the lowest fitness category to the next brings large benefits.
Accuracy and Limits
The Cooper test depends on pacing and motivation. Beginners often start too fast and fade, underestimating their fitness. The formula was developed in military populations, and the error for an individual can be 10% or more compared with a lab test. Track the same test over time on the same course under similar conditions, rather than relying on the absolute number.
Watch-based VO₂ max estimates use heart rate and pace data and can differ from Cooper results, so use consistent methods for comparisons.
Improving VO₂ Max
Combine easy aerobic running to build the base, tempo work, and interval sessions such as 4 × 4 minutes at hard effort with equal recovery. Most people see improvements in 6 to 12 weeks of consistent training. Weight loss also raises VO₂ max per kilogram, since the measure is relative to body weight.
Frequently Asked Questions
What is the Cooper test formula?
VO₂ max ≈ (distance in meters − 504.9) ÷ 44.73 for a 12-minute run.
Is the Cooper test accurate?
It is a reasonable field estimate, typically within 10% of lab values for experienced runners, with more error for beginners.
What is a good VO₂ max?
It depends on age and sex, but values above 40 mL/kg/min are generally good for adults, with trained athletes far higher.
How often can I do the test?
Every 6 to 8 weeks is enough to track progress without excess fatigue.
Can I do the test on a treadmill?
Yes, with a 1% incline, but pacing is easier on a track.