A good VO2 max depends heavily on your age and sex, but as a general benchmark, most adults with above-average fitness fall between 30 and 45 ml/kg/min. VO2 max measures the maximum amount of oxygen your body can use during intense exercise, expressed in milliliters of oxygen per kilogram of body weight per minute. It’s widely considered the single best indicator of cardiovascular fitness, and it declines naturally with age, roughly 10% per decade after your mid-20s.
VO2 Max Ranges by Age and Sex
The following ranges reflect commonly used fitness classifications based on population data. “Good” typically refers to scores above the 60th percentile for your age group, meaning you’re fitter than most people your age.
Men (ml/kg/min)
- Age 20–29: Good is roughly 42–49, excellent is 50+, and average sits around 36–42
- Age 30–39: Good is roughly 41–47, excellent is 48+, and average sits around 34–40
- Age 40–49: Good is roughly 38–44, excellent is 45+, and average sits around 31–38
- Age 50–59: Good is roughly 34–41, excellent is 42+, and average sits around 28–34
- Age 60–69: Good is roughly 31–37, excellent is 38+, and average sits around 24–30
- Age 70+: Good is roughly 28–34, excellent is 35+, and average sits around 21–27
Women (ml/kg/min)
- Age 20–29: Good is roughly 36–43, excellent is 44+, and average sits around 30–36
- Age 30–39: Good is roughly 34–40, excellent is 41+, and average sits around 28–34
- Age 40–49: Good is roughly 31–37, excellent is 38+, and average sits around 25–31
- Age 50–59: Good is roughly 28–34, excellent is 35+, and average sits around 22–28
- Age 60–69: Good is roughly 25–31, excellent is 32+, and average sits around 20–25
- Age 70+: Good is roughly 23–28, excellent is 29+, and average sits around 18–23
These ranges vary slightly depending on the source, but the pattern is consistent: women’s values run about 10–15% lower than men’s at every age, largely because of differences in hemoglobin levels and body composition rather than effort or training capacity.
Why VO2 Max Drops With Age
The decline isn’t just about getting slower. Your maximum heart rate drops about one beat per year as you age, which limits how much blood your heart can pump during peak effort. But research published in the American Journal of Physiology found that the bigger bottleneck isn’t actually your heart. In longitudinal studies tracking individuals over time, the steepest declines in VO2 max were linked to reduced peripheral oxygen utilization, meaning your muscles become less efficient at extracting and using the oxygen your blood delivers. Cardiac output held up relatively well by comparison.
This matters because it suggests that muscle-level fitness, not just heart health, plays a major role in maintaining your VO2 max as you age. Strength training and high-intensity work that challenges your muscles may be just as important as steady-state cardio.
Why Your VO2 Max Number Matters
VO2 max isn’t just a performance metric for athletes. It’s one of the strongest predictors of how long you’ll live. A large study published in the Journal of the American College of Cardiology, covering a broad population across ages, races, and sexes, found that the least fit individuals (bottom 20th percentile) had a four-fold higher risk of dying from any cause compared to the most fit. That’s a bigger risk gap than smoking, diabetes, or hypertension in many analyses.
The lowest mortality risk in that study appeared at about 14 METs of exercise capacity, which translates to roughly 49 ml/kg/min. Critically, there was no point where being more fit became harmful. Even extremely high fitness levels continued to show protective effects, contradicting the old idea that too much exercise might be dangerous.
You don’t need to reach elite levels to see benefits. Moving from the bottom 20% to even an average level of fitness cuts your risk dramatically. Every few points of VO2 max you gain translates to measurably better odds.
How To Estimate Your VO2 Max
Gold-standard VO2 max testing involves breathing into a mask while running on a treadmill at progressively harder intensities until you can’t continue. It’s accurate but expensive, typically $150–$300 at a sports performance lab or university.
A free alternative is the Cooper 12-minute run test. Run as far as you can in 12 minutes on a flat surface, then plug your distance into this formula: VO2 max = (35.97 × miles covered) − 11.29. If you measure in kilometers, use (22.351 × kilometers) − 11.288. So if you cover 1.5 miles in 12 minutes, your estimated VO2 max is about 43 ml/kg/min.
Smartwatches from Garmin, Apple, and other brands also estimate VO2 max using heart rate data and pace. These estimates are useful for tracking trends over time, but they can be off by several points in either direction compared to lab testing. If your watch says 38 and you want to know if you’re truly in the “good” range, treat it as a ballpark. The trend line over months is more informative than any single reading.
How Much Can You Improve?
If you’re currently inactive, you can typically improve your VO2 max by 15–20% within a few months of consistent training. People who are already moderately fit will see smaller but still meaningful gains, often in the range of 5–10%.
High-intensity interval training is the most time-efficient way to push your VO2 max higher. A meta-analysis of HIIT studies found significant improvements over conventional steady-state training. The most effective protocols used recovery intervals of two minutes or longer, with easy recovery periods between hard efforts. In practical terms, that looks like four to six rounds of 3–4 minutes at near-maximum effort, separated by 2–3 minutes of easy jogging or walking, done two to three times per week.
Steady-state cardio still helps, especially for building the aerobic base that supports harder training. A combination of both delivers the best results for most people.
Elite Athletes Set the Ceiling
For context on how high VO2 max can go, elite male endurance athletes regularly test between 70 and 85 ml/kg/min. The highest values ever recorded are around 96 ml/kg/min in men and 80 ml/kg/min in women, both from world-class cross-country skiers. These numbers reflect years of training layered on top of exceptional genetics.
Most recreational exercisers will never approach those numbers, and they don’t need to. A 55-year-old man with a VO2 max of 40 is in excellent shape for his age and carries a fraction of the mortality risk of his sedentary peers. The goal isn’t to compete with Olympians. It’s to be as far above the bottom of your age group as you can get.