Choose a method you can repeat. If you already have a VO2 max from Apple Watch, Garmin or a lab, enter it directly and choose its source. The calculation stays in your browser.
What the result means
VO2 max describes oxygen use during maximal exercise, relative to body weight. Your percentile compares the result with people in the same age decade and sex category in FRIEND 2015, Table 3. That study included 7,783 treadmill tests in US adults without known cardiovascular disease. It is a reference sample, not a census of everyone your age.
Percentiles between published cut points are linearly interpolated and labelled approximate. Below the 5th or above the 95th percentile, only a bound is shown. Ages 18–19 and 80–90 can calculate VO2 max, but receive no percentile because this reference does not cover them. “Middle range” means the 25th to below the 75th percentile; it is a display category, not a clinical threshold.
VO2 max age uses the existing reference curve shared with our biological age quiz. It is the age at which that curve has a similar typical VO2 max, bounded at 18 and 95. The quiz curve and the FRIEND percentile table are separate references, so their medians need not agree. It is not a measured biological age or a promise of extra years of life.
How the four methods work
- Heart-rate ratio:
15.3 × maximum heart rate ÷ resting heart rate. Uth and colleagues studied well-trained men aged 21–51. Applying it to women, other ages or people on heart-rate-altering medication has additional uncertainty. With no known maximum, we use Tanaka’s adult estimate:208 − 0.7 × age. - Rockport one-mile walk:
132.853 − 0.0769 × weight in lb − 0.3877 × age + 6.315 if male − 3.2649 × minutes − 0.1565 × finish heart rate. The Kline study developed the equation in adults aged 30–69. Use a measured track or flat route; do not substitute a treadmill test or a jog. Record heart rate during the final 10 seconds, as described in the PhenX testing protocol, because it falls quickly after you stop. Enter decimal minutes: 15 minutes 30 seconds is 15.5. - Cooper 12-minute run:
(distance in metres − 504.9) ÷ 44.73. It is a field estimate influenced by pacing and running ability; validation research shows that population matters. Imperial distance is in miles, not yards. - Known value: uses your entered number without recalculating it. A watch estimate remains an estimate; a lab test with gas analysis measures oxygen uptake. Keep watch and lab results separate when comparing, and use the same watch or lab protocol each time.
Turn a number into a repeatable habit
Fitness is associated with longevity, but a six-week change is not an individual mortality-risk calculation. Retest with the same method, equipment and conditions. Read why VO2 max matters, what the JAMA study actually shows and how to raise VO2 max in 12 weeks.
Use the Zone 2 calculator to plan an easy training range, then read Zone 2 versus HIIT. Sarvita reads VO2 max recorded in Apple Health and follows the trend over time.
Estimate only, not medical advice. Do not perform an all-out run or a maximal heart-rate test just to fill in this calculator. If exercise testing may be unsuitable for you, use an existing result and discuss testing with a qualified professional.