What it is
The maximum rate the body can use oxygen during hard exercise, in mL/kg/min. A lab test measures it. A watch estimates it. This calculator scores the number you enter, not a percentile and not a MET bin.
How the score uses it
Technical notes
The curve is a constructed smooth curve (HR=1.0 at 38 mL/kg/min men / 31 women — an ACSM ~45yo midpoint, not a mortality paper). Nearest matching-construct all-cause mortality meta is per 1-MET (3.5 mL/kg/min): Singh 2024 (42 studies / 3.8 million, 81% male) RR 0.86 (0.83–0.88), and estimated CRF (exercise tests without gas, or non-exercise equations) was not statistically different from lab CPET. That is not a Garmin/Apple-watch HR — no consumer-watch all-cause mortality estimate is available. Lang 2024’s headline high-vs-low 0.47 is Han 2022 extracted, not a Lang pooling. Mandsager 2018’s 5.04 is a referred-clinic percentile contrast (low vs elite estimated METs), not this curve (low end 1.6). Kodama’s <7.9 MET bin is not a consumer mL/kg/min goal. No absolute-mL all-cause mortality meta-analysis is available, so the curve is not changed on this evidence. No numeric target is set.
How to improve it
- Build an aerobic base with Zone 2 cardio (conversational pace)
- Add one or two weekly high-intensity intervals
- Progress gradually and stay consistent for months, not weeks
- In 28 controlled trials of adults 18–45, endurance training raised VO₂ max about 4.9 mL/kg/min and interval training about 5.5 versus no-exercise controls (Milanović 2015). These are fitness gains, not mortality estimates.
VO₂ max by age and sex
These norms come from Kaminsky et al. (2015, Mayo Clinic Proceedings), the FRIEND registry’s first U.S. reference standards for directly measured cardiorespiratory fitness. Eight U.S. laboratories contributed 7,783 maximal treadmill cardiopulmonary exercise tests (4,611 men, 3,172 women), collected 2014–2015 from adults 20–79 without known cardiovascular disease. These were people referred for fitness testing before an exercise program or research study — not a random sample of the general population. The table reports seven percentiles (5th, 10th, 25th, 50th, 75th, 90th, 95th) for each 10-year age band; this tool always places a value against the band that contains the entered age, never an interpolated in-between value.
Men, ages 40–49 (n=1,327) — reported percentiles in mL/kg/min
Enter a VO₂ max value above to see where it falls against these percentiles.
Full percentile table (men)Open
| Age | n | 5th | 10th | 25th | 50th | 75th | 90th | 95th |
|---|---|---|---|---|---|---|---|---|
| 20–29 | 513 | 29 | 32.1 | 40.1 | 48 | 55.2 | 61.8 | 66.3 |
| 30–39 | 963 | 27.2 | 30.2 | 35.9 | 42.4 | 49.2 | 56.5 | 59.8 |
| 40–49 | 1,327 | 24.2 | 26.8 | 31.9 | 37.8 | 45 | 52.1 | 55.6 |
| 50–59 | 1,078 | 20.9 | 22.8 | 27.1 | 32.6 | 39.7 | 45.6 | 50.7 |
| 60–69 | 593 | 17.4 | 19.8 | 23.7 | 28.2 | 34.5 | 40.3 | 43 |
| 70–79 | 137 | 16.3 | 17.1 | 20.4 | 24.4 | 30.4 | 36.6 | 39.7 |
mL O₂ · kg⁻¹ · min⁻¹. Source: Kaminsky et al. 2015, Table 3 (FRIEND rows only).
This isn’t a random sample of everyone. FRIEND’s participants were referred for exercise testing at 8 U.S. laboratories, not sampled from the general population -- and, like most reference cohorts, the oldest and youngest decades have far fewer people in them (as few as 98–137 in the 70s band) than the middle decades.
Treadmill and cycle tests aren’t interchangeable. This table is treadmill-only. A cycle-ergometer test uses a smaller set of leg muscles and tends to read lower than a treadmill test for the same person -- don’t compare a cycle-based number to this table directly.
A percentile is not a verdict. Training can raise VO₂ max; what is unproven is how much that changes your own risk. Studies on this page show higher measured fitness is associated with lower all-cause mortality in large populations -- that is an association, not proof that raising your own number by a given amount changes your own risk by a matching amount.
VO₂ max is one of the eight markers that build your MarkerScore.
Norms last reviewed 12 October 2026.