VO2 max — the maximum rate your body can use oxygen during exercise — normally needs lab testing, but this non-exercise estimate needs only age and resting heart rate.
How it works
Estimated maximum heart rate (220 minus age) is divided by resting heart rate, then multiplied by 15.3, using the Uth-Sørensen-Overgaard-Pedersen heart-rate-ratio method.
What this does not include
This does not include an actual exercise or treadmill test — lab-measured VO2 max is more accurate than any non-exercise estimate, this included.
How to use this calculator
- Enter your age and resting heart rate (measured first thing in the morning, before getting up, for best accuracy).
A worked example
Age 30, resting heart rate 60: estimated max heart rate = 220 − 30 = 190, estimated VO2 max = 48.45 mL/kg/min.
Age 50, resting heart rate 70: estimated VO2 max = 37.16 mL/kg/min — noticeably lower, reflecting the typical decline in aerobic capacity with age and a higher resting heart rate.
What the variables mean
| Variable | Meaning |
|---|---|
| Age | Used to estimate maximum heart rate |
| Resting heart rate | Heart rate at complete rest, a proxy for cardiovascular fitness |
Edge cases worth knowing
A lower resting heart rate at the same age estimates a higher VO2 max — reflecting the real physiological link between cardiovascular fitness and a slower resting pulse.
This is a population-average estimate, not a lab-measured value. True VO2 max requires a supervised exercise test measuring actual oxygen consumption — this formula-based estimate is a reasonable approximation, not a clinical substitute.
Frequently asked questions
How accurate is a non-exercise VO2 max estimate?
It correlates reasonably well with lab-measured values for the general population but is less precise for highly trained athletes or those with unusual heart-rate profiles.
Why does a lower resting heart rate suggest higher fitness?
A lower resting heart rate typically reflects a more efficient heart, pumping more blood per beat — a hallmark of cardiovascular fitness that this formula captures through the HRmax-to-HRrest ratio.
What’s a “good” VO2 max?
It varies significantly by age and sex, with trained endurance athletes often scoring far above the general population average.
