VO2 Max Calculator
Estimate your aerobic capacity using the Cooper run test or heart rate formula.
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This calculator supports two methods to estimate VO2 max. Choose the method based on the data you have available.
- Cooper 12-min run test. Run as far as possible in exactly 12 minutes on a flat surface. Measure the distance in meters and enter it above. This is the most direct field test and provides a reasonably accurate estimate when performed at a true maximal effort.
- Uth heart rate formula. This method requires your maximum heart rate and your resting heart rate. Max HR is best measured during a genuine maximal effort (a hill sprint or very hard interval workout). Resting HR should be measured after several minutes of lying still, ideally first thing in the morning. The formula VO2 max = 15.3 × (maxHR / restHR) is a validated estimation tool.
Select your sex to apply the correct fitness category thresholds. Results update live.
About VO2 Max
VO2 max (maximal oxygen uptake) is the maximum rate at which the body can consume oxygen during intense exercise. It is expressed in milliliters of oxygen per kilogram of body weight per minute (ml/kg/min) and is considered the gold standard measure of aerobic fitness. Higher VO2 max values correlate strongly with improved cardiovascular health, reduced all-cause mortality, and better endurance performance.
Elite male endurance athletes often have VO2 max values above 70 ml/kg/min. Cross-country skier Oskar Svendsen recorded the highest ever tested at 97.5. A sedentary 40-year-old male typically falls around 35 to 40. VO2 max is trainable: consistent aerobic exercise can improve it by 15 to 25 percent over several months of training.
Frequently Asked Questions
What is a good VO2 max for my age?
VO2 max declines about 1 percent per year after age 25. For men aged 20 to 29, a good VO2 max is 45 to 52 ml/kg/min; for women the same age, 38 to 44. For men aged 40 to 49, good is 39 to 45; for women 33 to 39. "Excellent" and "Superior" categories require values in the top 20 percent for your age and sex group. Regular aerobic exercise can significantly slow the age-related decline.
How accurate is the Cooper 12-minute run test?
When performed correctly at genuine maximal effort, the Cooper test correlates well with laboratory VO2 max measurements, with studies showing correlation coefficients of 0.88 to 0.90. Accuracy depends heavily on pacing. Starting too fast causes early fatigue; starting too slow leaves potential untapped. Use the last lap to push hard. Weather, terrain, and footwear also affect results. The test is best for tracking changes in your own fitness over time rather than as a precise absolute measurement.
How can I improve my VO2 max?
VO2 max responds best to high-intensity interval training (HIIT) at 90 to 100 percent of max heart rate. Classic protocols include 4 × 4 minutes at high intensity with 3-minute active recovery (the Norwegian 4x4 protocol) or 1-minute on/1-minute off intervals. Steady-state aerobic training at moderate intensity also improves VO2 max, especially for beginners. Consistency over 8 to 12 weeks is needed to see significant gains of 10 to 25 percent.
What is the Uth heart rate formula?
The Uth-Sorensen-Overgaard-Pedersen formula (2004) estimates VO2 max as 15.3 multiplied by the ratio of maximum to resting heart rate. For example, with a max HR of 185 and resting HR of 55, VO2 max ≈ 15.3 × (185/55) ≈ 51.5. The formula was validated in a Danish study and correlates reasonably well with laboratory measurements. Accuracy depends on accurately measuring both heart rates, particularly true maximum heart rate, which requires genuine maximal exertion.