Estimate your aerobic fitness with this free VO2 max estimator. It uses either the Cooper 12-minute run test or your resting heart rate to estimate VO2 max, with a fitness category for your age and sex.
Run/walk as far as you can on flat ground in exactly 12 minutes, then enter the distance. Warm up first and only attempt if you’re healthy and used to exercise.
Uses VO2max = 15.3 x (max HR / resting HR), with max HR estimated as 220 minus age. Measure your resting heart rate when fully at rest.
An estimate, not a lab test. True VO2 max is measured with specialised equipment. Field estimates have a meaningful margin of error – use them to track trends, not as exact figures.
How the VO2 Max Estimator Works
This calculator estimates your VO2 max — a common marker of aerobic fitness — using either the distance you cover in a 12-minute run (the Cooper test) or your resting heart rate, then places the result into a fitness category for your age and sex.
Formula (Cooper 12-minute test): VO2 max = (Distance in meters − 504.9) ÷ 44.73. Formula (resting heart rate method): Max heart rate (HRmax) = 220 − Age, then VO2 max = 15.3 × (HRmax ÷ Resting heart rate).
- Distance covered in 12 minutes — how far you ran or walked in exactly 12 minutes (Cooper test method), in meters or miles.
- Age — used to estimate max heart rate (220 − age) for the resting heart rate method, and to look up your fitness category.
- Resting heart rate — your heart rate at full rest, used in the resting heart rate method’s formula.
- Sex and category age — selected to look up your VO2 max fitness category (Poor through Superior) against age- and sex-specific benchmark ranges.
Example Scenarios
| Method | Input(s) | Sex, Age | VO2 Max & Category |
|---|---|---|---|
| Cooper 12-min test | 1,800 m | Male, 35 | 29.0 ml/kg/min — Poor |
| Cooper 12-min test | 2,400 m | Male, 28 | 42.4 ml/kg/min — Good |
| Cooper 12-min test | 2,800 m | Male, 55 | 51.3 ml/kg/min — Superior |
| Resting HR method | Age 30, resting HR 65 bpm | Male, 30 | 44.7 ml/kg/min — Excellent |
| Cooper 12-min test | 2,000 m | Female, 45 | 33.4 ml/kg/min — Good |
| Resting HR method | Age 50, resting HR 55 bpm | Male, 50 | 47.3 ml/kg/min — Superior |
Getting a Fair Reading from the VO2 Max Estimator
The two methods in this VO2 max estimator suit different people. The Cooper test is generally more informative for people who already run; the resting heart rate method is a rough screen that needs no exercise at all.
- For the Cooper test, use a measured track or flat route, warm up first and pace evenly. Starting too fast and fading is a common reason for a disappointing VO2 max estimator result.
- Take resting heart rate in the morning, before coffee, after sitting quietly for a few minutes. Stress, caffeine and some medicines change it.
- Retest under the same conditions, since weather, hills and fatigue all shift the VO2 max estimator reading.
Any VO2 max estimator gives an estimate, not a lab measurement; a treadmill test with gas analysis is the reference method.
The Cooper test is a maximal effort. If you are new to exercise, have a heart condition, get chest pain or dizziness, or take heart medication, speak to a doctor before trying it. The VO2 max article on Wikipedia explains what the number means and how it relates to the VO2 max estimator categories.
VO2 Max Estimator FAQ
Which method is more accurate: Cooper test or resting heart rate?
Both are field estimates, not laboratory measurements, so neither is exact. The Cooper 12-minute run test directly measures a real performance effort, while the resting heart rate method is quicker but relies more heavily on the 220 minus age max heart rate estimate, which has its own margin of error.How do I safely perform the Cooper 12-minute run test?
Warm up beforehand, then run or walk as far as you can on flat ground for exactly 12 minutes at a pace you can sustain the whole time. Only attempt it if you’re healthy and already used to exercise, and stop if you feel chest pain, dizziness, or unusual breathlessness.What do the fitness categories (Poor to Superior) mean?
The calculator compares your estimated VO2 max against benchmark ranges specific to your age group and sex, sorting the result into Poor, Fair, Good, Excellent, or Superior. These labels describe where your estimate falls relative to typical ranges for people your age and sex, not a medical diagnosis.Can women and men use the same VO2 max formula?
The VO2 max formulas themselves (Cooper test and resting heart rate) are the same for everyone. Sex is used only afterward, to select the correct age- and sex-specific benchmark table when categorizing your result as Poor through Superior.How does VO2 max relate to overall cardiovascular fitness?
VO2 max estimates the maximum rate at which your body can use oxygen during intense exercise, and it’s commonly used as a general indicator of aerobic fitness. A higher estimate generally suggests a greater capacity for sustained cardiovascular effort, though it’s only one piece of overall fitness.Why do I need to enter my age and sex for the category?
VO2 max naturally varies by age and sex, so the calculator uses separate benchmark ranges for each age bracket and sex to place your number in context. Without both, it can still estimate your VO2 max number but can’t tell you how that number compares to others.Related Calculators
Once you know your estimated VO2 max, the exercise heart rate calculator can turn your age and optional resting heart rate into a target training range, while the heart rate zone calculator breaks the same inputs into all five training zones. After a hard session, the recovery heart rate calculator can help you see how quickly your heart rate settles back down. See also the Grade Adjusted Pace Calculator.