Free VO2 max calculator estimates cardiorespiratory fitness from a 12-minute run or resting heart rate, with age- and sex-based fitness categories.
VO2 max (maximal oxygen uptake) is the highest rate at which your body can consume oxygen during intense exercise, measured in milliliters per kilogram per minute. It is the gold-standard indicator of cardiorespiratory fitness, and higher values are strongly linked to a lower risk of heart disease.
This calculator estimates your VO2 max with two validated methods. The Cooper test uses your distance in a 12-minute run, while the heart-rate ratio method uses your resting heart rate and age. Both are practical ways to track fitness without a lab.
After estimating your VO2 max, the calculator compares it with the ACSM normative table for your age and sex and shows your fitness category, from very poor to superior. Use the result to benchmark your training and retest every few months.
Choose a method, enter your details, and the fitness category updates instantly.
It depends on age and sex. For men aged 20-29, values above 43.9 ml/kg/min are at least Good; for women of the same age, above 39.5. In general, reaching at least the Good rating for your age and sex is linked to a meaningfully lower risk of cardiovascular disease.
The Cooper and heart-rate ratio equations are published, validated formulas, but field estimates typically differ from laboratory measurement by about 3-5 ml/kg/min. They are most useful for tracking changes over time rather than exact diagnosis.
Warm up for 10 minutes, then run or walk as far as possible in exactly 12 minutes on a flat, measured course. Record the distance in meters and enter it. Do not attempt this at maximal effort without adequate fitness or medical clearance.
Fitter hearts pump more blood per beat, so they beat less often at rest. A lower resting heart rate relative to your maximum produces a higher HRmax/HRrest ratio, which the Uth equation converts into a higher VO2 max estimate.
Yes. Most people improve by 10-30% with structured training. Interval training produces the fastest gains (about 5-8% in 6-12 weeks), while consistent moderate-intensity running also raises it steadily.
Use the Cooper test if you can run and want a field-based benchmark. Use the resting heart rate method if you cannot do a maximal test or want a quick estimate. Track the same method over time for comparable results.