Estimate your VO₂max without a lab: the 12-minute run and the 1-mile walk

The protocol is simple. On a flat, measured course, a 400 m track being the easiest, cover as much distance as you can in 12 minutes. It is an all-out effort, and pacing matters: start too fast and you lose more in the last minutes than you gained.

The usual conversion, attributed to Cooper’s 1968 paper, is:

• VO₂max (mL/kg/min) = (metres covered − 504.9) ÷ 44.73

So 2,400 m gives about 42.4. To reach 40 you would need about 2,294 m. Every 44.73 m adds one point, so one extra lap of a 400 m track is worth about 9 mL/kg/min. Measure the course carefully: a small error in distance is a large error in the result.

The equation was derived in young US Air Force men. We have not read the original paper; the formula is as cited in later peer-reviewed work, and we do not quote its sample size because secondary sources disagree on it.

In a 2011 study, 60 young adults (mean age 21.8) ran the test three times. Reliability was very high, with a coefficient of 0.96: people covered nearly the same distance each time.

Twenty-one of them also had a lab treadmill test. On average the run matched the lab. But the error depended on fitness: low values came out too low and high values too high.

That makes the test good for the job of re-testing yourself, and weaker for ranking yourself at either end of the scale. It was studied in young adults, not in middle-aged or older people.

Walk one mile (1,609 m) as fast as you can, without running. Note your time to the second and your heart rate as you finish, from a chest strap or a watch. On a 400 m track, a mile is four laps plus 9 m.

The equation, as cited from Kline and colleagues (1987) in later papers:

• VO₂max = 132.853 − 0.0769 × weight (lb) − 0.3877 × age + 6.315 × sex (men = 1, women = 0) − 3.2649 × time (min) − 0.1565 × heart rate

Weight is in pounds (kg × 2.2046) and time in decimal minutes (15:30 is 15.5). A man of 50 weighing 180 lb who walks the mile in 15.0 minutes and finishes at 130 beats a minute gets about 36.6. Each minute faster adds about 3.3 mL/kg/min, and each 10 beats lower at the finish adds about 1.6, which is why the heart-rate reading needs to be taken the same way every time.

The original study tested 343 healthy adults aged 30–69 (165 men, 178 women) whose VO₂max was measured on a treadmill. The best equation correlated with the lab at r = 0.93, and at r = 0.92 when tried on another 169 people. A correlation that high means the estimates line up well across people; it does not tell you how far off one person can be. The abstract does not print the mL/kg/min equation, and we have not verified its error in mL/kg/min, so we do not quote one.

Run if you already run and can hold a hard pace for 12 minutes. Walk if running is not an option, or if you are between 30 and 69, the ages the walk was built on. Neither study tells you which is more accurate for someone your age, because they were done in different people.

Neither test needs your maximum heart rate. If you want to know how hard the walk was relative to it, the better-validated estimate is 208 − 0.7 × age, from a meta-analysis of 18,712 people. It reads higher than 220 − age in older adults: at 60 it gives 166, against 160. It is a population average, and individuals vary around it.

For a result you can compare next quarter, keep everything the same: course, surface, time of day, shoes, and the device that reads your heart rate.

Both are hard efforts. If you have a heart condition or get symptoms on exertion, ask a doctor before trying either. This is not medical advice.

Longstanding offers both tests, beside a watch reading or a lab result, and uses the equations above. It labels the result an estimate. It does not yet flag ages outside 30–69 for the walk, where the equation was never validated, so treat a result there as rougher.

A field test repeated the same way each quarter is a better input than a watch, whose single readings can be off by about 10 mL/kg/min. The app scores the result against the Cooper Institute table, not FRIEND, which matters at older ages; two sets of norms explains why.

The protocols are on the VO₂max test page, and you can see where an estimate sits for your age in the calculator.