VO2 Max Calculator
The gold standard for measuring VO2 max is a lab test with a metabolic cart — but it costs $200–500 and requires a clinical visit. We built this calculator so you can estimate your VO2 max for free using any of 17 validated field tests. See how each test compares to the lab test.
How to use this calculator
- Pick a test. The default is the Cooper 12-minute run. If you don't run, try the Rockport 1-mile walk or Åstrand-Rhyming cycle test.
- Enter your inputs. Age, sex, and test-specific measurements like distance covered, time, or heart rate.
- Read the result. Your VO2 max in ml/kg/min, your age- and sex-adjusted percentile, and your fitness category (Poor, Fair, Average, Good, Excellent, Superior).
- Compare and improve. See the full chart or jump to how to improve VO2 max.
Which test is right for you?
What activity can you do?
Calculate Your VO2 Max
How to perform the Cooper 12-Minute Run
Run as far as possible in 12 minutes. VO2 max is estimated from total distance covered.
- Equipment
- Track or flat course
- Time
- ~12 minutes
- Find a flat, measured course — a 400m track is ideal.
- Warm up for 10–15 minutes with easy jogging and a few short strides.
- Run as far as you can in exactly 12 minutes, pacing evenly from the start.
- Record the total distance covered to the nearest 25–50 meters.
- Cool down with 5–10 minutes of easy jogging.
Read the full Cooper 12-min protocol, formula, and accuracy data →
What is VO2 max?
VO2 max — short for maximal oxygen uptake — is the highest rate at which your body can consume and use oxygen during exercise. It is expressed in milliliters of oxygen per kilogram of body weight per minute (ml/kg/min). Physiologically, it represents the ceiling of your aerobic energy system: how much oxygen your lungs can extract, your heart can pump, your blood can carry, and your muscles can use.
VO2 max is the most thoroughly validated measure of cardiorespiratory fitness in exercise physiology. It is also one of the strongest known predictors of all-cause mortality: a 2018 JAMA Network Open study following 122,007 adults found that each one-MET increase in treadmill performance was associated with a 12% reduction in mortality risk, with the fittest quintile showing a 5-fold survival advantage over the least fit.
Why it matters
- Strongest single predictor of longevity among modifiable risk factors.
- Correlates with endurance performance across running, cycling, rowing, and skiing.
- Trackable over time — a direct signal of whether your training is working.
- Responsive to training: 5–20% gains in 6–12 weeks are typical in untrained adults.
The 17 test methods
Each test uses a peer-reviewed regression equation validated against direct gas analysis. Running tests are the most accurate for runners; walking and cycling tests are preferred when running isn't practical.
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Frequently asked questions
- What is VO2 max?
- VO2 max is the maximum volume of oxygen your body can use during intense exercise, measured in milliliters per kilogram of body weight per minute (ml/kg/min). It is the single most validated measure of cardiorespiratory fitness and a strong independent predictor of all-cause mortality.
- How is VO2 max calculated?
- Each field test uses a validated regression equation. For example, the Cooper 12-minute run uses VO2 max = (35.97 × miles) − 11.29. The Rockport 1-mile walk uses VO2 max = 132.853 − (0.0769 × weight in lb) − (0.3877 × age) + (6.315 × sex) − (3.2649 × walk time) − (0.1565 × final heart rate). This calculator implements 17 such equations from peer-reviewed literature.
- What is a good VO2 max?
- A good VO2 max depends on age and sex. For a 35-year-old man, 42 ml/kg/min is average (50th percentile) and 49 ml/kg/min is good (75th percentile). For a 35-year-old woman, 30 is average and 36 is good. See the full chart for every age bracket.
- Which test is most accurate?
- For running-trained individuals, the 1.5-mile run and Cooper 12-minute run are the most accurate field tests (r ≈ 0.90 against lab treadmill VO2 max). For non-runners, the Rockport 1-mile walk is preferred. The Åstrand-Rhyming cycle ergometer test is the best submaximal option and does not require running.
- Is this calculator free?
- Yes. All 17 calculators, the percentile tool, and every reference chart are free and require no signup. We support the site through Google AdSense ads and Amazon affiliate links for training equipment.
- How often should I retest?
- Every 4–8 weeks for trained athletes, every 8–12 weeks for recreational exercisers. VO2 max responds measurably to 6–8 weeks of consistent aerobic training, with typical gains of 5–20% in untrained individuals.
- Does VO2 max change with age?
- VO2 max typically declines about 10% per decade after age 30 in untrained adults, though consistent aerobic training slows this to roughly 5% per decade. Masters athletes in their 60s routinely test at levels above untrained 30-year-olds.
Medical disclaimer
This site provides educational fitness information only. It is not a substitute for professional medical advice, diagnosis, or treatment. The VO2 max estimates produced by these calculators are approximations derived from field-test regression equations — they are not clinical measurements. Always consult a qualified healthcare provider before beginning any exercise program or if you have any concerns about your cardiovascular health.