VO₂ Max Calculator
Estimate your cardiorespiratory fitness and endurance capacity using heart-rate data or a 12-minute walk/run test.
How to use this calculator
Follow these three simple steps.
Choose a method
Select the heart-rate method or the 12-minute walk/run method.
Enter your data
Use recent resting heart rate, maximum heart rate, or test distance.
Track your trend
Repeat the same method under similar conditions to compare results.
Estimate your VO₂ max
Choose the method that matches the information you have available.
Enter your information
Use accurate, recent measurements whenever possible.
Your estimated result
Use this result as a trend marker rather than a diagnosis.
How this result was calculated
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How to interpret it
A higher VO₂ max generally reflects greater aerobic capacity, but results should be compared using the same method.
What does VO₂ max mean?
VO₂ max describes the maximum amount of oxygen your body can use during intense exercise. It is commonly used as a measure of cardiorespiratory fitness.
Laboratory measurement
A laboratory test measures breathing gases while exercise intensity increases under supervision. This is more direct than an online estimate.
Field estimation
Field methods use heart rate or exercise performance to estimate aerobic capacity. They are useful for tracking trends but have more uncertainty.
How the formulas work
Each method is based on a different type of input, so do not compare results from different methods as if they were identical tests.
Heart-rate ratio method
The calculator uses the measured maximum heart rate when provided. Otherwise, it estimates maximum heart rate from age.
This method is best used for consistent trend tracking. Its accuracy can vary between individuals and populations.
12-minute walk/run method
Enter the total distance covered during a 12-minute walk or run.
Repeat the test on a similar surface, with similar weather and preparation, if you want to compare future results.
Tips for more consistent results
Consistency makes an estimate more useful for personal tracking.
Keep the time of day, surface, weather, and warm-up as consistent as possible.
Wearable readings can vary. A measured maximum heart rate is preferable to an age-based estimate.
Fitness trends are more useful than one isolated result from a single day.
Prepare gradually before vigorous exercise and cool down afterward.
Stop exercise and seek help for chest discomfort, dizziness, confusion, or unusual breathlessness.
Speak with a healthcare professional before vigorous testing if you have a medical condition or have been inactive.
VO₂ max FAQs
Answers to common questions about this calculator.
