A good VO2 max depends on your age and sex, but as a general benchmark, scoring above the 50th percentile for your demographic puts you in the “fair” to “good” range, while the 75th percentile and above is where real health benefits accelerate. For men in their 30s, that 50th percentile mark is about 30 ml/kg/min; for women in their 30s, it’s roughly 22 ml/kg/min. But “good” also depends on your goals. If you care about longevity more than athletic performance, even modest improvements from a low starting point deliver outsized returns.
What VO2 Max Actually Measures
VO2 max is the maximum amount of oxygen your body can use during intense exercise, measured in milliliters of oxygen per kilogram of body weight per minute (ml/kg/min). It reflects the combined capacity of your heart to pump blood, your lungs to take in air, and your muscles to extract and use oxygen. The main bottleneck for most people is the heart. As exercise intensity climbs, your heart rate rises but eventually can’t fill with enough blood between beats, limiting how much oxygen reaches working muscles.
In practical terms, a higher VO2 max means you can sustain harder efforts before hitting a wall. It’s the single best measure of cardiovascular fitness, and the American Heart Association has called for it to be treated as a clinical vital sign alongside blood pressure and heart rate.
VO2 Max Ranges by Age and Sex
The tables below show where different VO2 max values fall for men and women across age groups. Find your age bracket and see where your number lands. These values come from fitness norms published by the NFPA, which align closely with categories used in exercise science.
Men (ml/kg/min)
- Age 20–29: Superior 58+, Excellent 55+, Good 49+, Fair 43, Poor 37 and below
- Age 30–39: Superior 45+, Excellent 42+, Good 35+, Fair 31, Poor 28 and below
- Age 40–49: Superior 42+, Excellent 37+, Good 32+, Fair 28, Poor 25 and below
- Age 50–59: Superior 37+, Excellent 34+, Good 29+, Fair 26, Poor 23 and below
- Age 60–69: Superior 32+, Excellent 30+, Good 26+, Fair 23, Poor 21 and below
Women (ml/kg/min)
- Age 20–29: Superior 45+, Excellent 43+, Good 37+, Fair 32, Poor 27 and below
- Age 30–39: Superior 33+, Excellent 30+, Good 25+, Fair 22, Poor 20 and below
- Age 40–49: Superior 29+, Excellent 26+, Good 23+, Fair 20, Poor 18 and below
- Age 50–59: Superior 25+, Excellent 23+, Good 20+, Fair 18, Poor 16 and below
- Age 60–69: Superior 22+, Excellent 21+, Good 18+, Fair 16, Poor 15 and below
A few things stand out in these numbers. VO2 max declines steadily with age, roughly 10% per decade after your 20s, even in active people. Women’s values run about 20–25% lower than men’s at every age, largely due to differences in body composition, hemoglobin levels, and heart size. Neither of these patterns means improvement isn’t possible. It just means you should compare yourself to others in your age group, not to a universal number.
Why VO2 Max Matters for Longevity
VO2 max isn’t just a fitness-nerd stat. It’s one of the strongest predictors of how long you’ll live. A fitness level below about 5 METs (roughly 17.5 ml/kg/min) is associated with a high risk of dying from any cause. People at 8 to 10 METs and above, which translates to roughly 28–35 ml/kg/min, have significantly better survival rates.
The relationship between fitness and mortality follows a clear dose-response curve. In a study tracking adults for 30 years, published in the Journal of the American Heart Association, every 1-MET increase in fitness was associated with an 11% reduction in all-cause death and an 18% reduction in cardiovascular death. The least fit individuals had more than four times the mortality risk compared to the most fit. That gap is larger than the risk difference between smokers and nonsmokers in many studies.
The steepest gains come from moving out of the bottom tier. Going from “poor” to “fair” fitness provides a bigger mortality reduction than going from “good” to “excellent.” If your VO2 max currently places you in the lower percentiles, even a small improvement carries meaningful protection.
How Elite Athletes Compare
For context on what the human ceiling looks like: elite male endurance athletes typically record VO2 max values between 70 and 85 ml/kg/min. The highest value ever recorded in a man is around 96 ml/kg/min. Cross-country skiers tend to have the highest readings of any sport, with men commonly hitting 80–90 and women reaching 70–80 ml/kg/min. The highest recorded value in a woman is about 80 ml/kg/min.
These numbers are largely the product of genetics combined with decades of training. For a non-athlete, reaching the “excellent” or “superior” category for your age is a more realistic and still very meaningful target.
How To Improve Your VO2 Max
The most effective way to raise VO2 max is high-intensity interval training. One well-studied protocol involves four intervals of 4 minutes at 90–95% of your maximum heart rate, separated by 3 minutes of easy recovery at about 70% of max heart rate. Performed three times per week for 8 weeks, this approach reliably produces measurable improvements in both trained and untrained people.
You don’t need a track or fancy equipment. Here are three practical formats:
- Running intervals: Run 800 meters at roughly 90% of your max heart rate, then walk or light jog for the same amount of time it took you to run. Repeat 4 times.
- Sprint workout: 20-second all-out sprints with 10 seconds rest, done in sets of 10–15 intervals. Take 4 minutes of rest between sets, and aim for 3 sets total.
- Treadmill option: Set a 5% incline. Alternate between 1-minute intervals at a challenging speed (5–6.5 mph for most people) and 2-minute recovery walks at 3 mph. Repeat 6–8 times.
Three sessions per week appears to be the sweet spot for improving VO2 max while limiting injury risk. Steady-state cardio (longer, moderate-effort sessions) also works, but it typically requires more weekly time to produce the same gains. Most people benefit from a mix of both: one or two interval sessions and one or two longer, easier sessions per week.
Consistency matters more than intensity on any single day. If you’re starting from a low base, even brisk walking that gets your heart rate up will begin shifting your VO2 max in the right direction. As your fitness improves, progressively adding intensity gives your cardiovascular system a reason to keep adapting.
What Smartwatches Get Right and Wrong
If you’re checking your VO2 max on an Apple Watch, Garmin, or similar device, the number is an estimate based on your heart rate response during exercise, not a direct measurement. True VO2 max testing requires a lab with a metabolic cart that analyzes the air you breathe while exercising to exhaustion. Wrist-based estimates can be off by 5–10% or more, especially if you have an unusual heart rate profile or if the watch doesn’t fit snugly.
That said, the trend is more useful than any single reading. If your watch shows your VO2 max climbing over weeks and months of consistent training, that’s a reliable signal that your cardiovascular fitness is genuinely improving, even if the absolute number isn’t perfectly accurate.