VO2 Max Calculator

Aerobic capacity estimated from resting heart rate or a race time.

Estimate VO2 max from the ratio of maximum to resting heart rate, or from a recent race time, with fitness ratings by age and sex.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Sex

Age

years

Resting heart rate

bpm

The lower this is relative to your maximum, the higher the estimate.

Estimated VO2 max

46.8 ml/kg/min

Good

Estimated max heart rate184 bpm

Resting heart rate60 bpm

Max ÷ resting ratio3.1

METs equivalent13.4

The Uth-Sørensen estimate assumes your resting heart rate is measured properly on waking. A reading taken after coffee or movement will flatter or deflate the result substantially.

How the VO2 Max Calculator works

VO2 max is the ceiling on how much oxygen your body can use per minute, and it is among the strongest single predictors of all-cause mortality in the epidemiological literature. Laboratory measurement needs a mask and a treadmill; these estimates get within a few points for most people.

Also known as: aerobic capacity calculator · VO2 max from running · cardio fitness score

What VO2 max measures

Maximal oxygen uptake is the highest rate at which the body can take in and use oxygen during exercise, expressed in millilitres per kilogram of body weight per minute.

It is determined mainly by cardiac output, which is how much blood the heart can pump, and by the ability of muscle to extract oxygen from it. Both are trainable, with cardiac output responding more slowly.

It is one of the strongest single predictors of all-cause mortality, with large cohort studies finding the association stronger than for smoking, hypertension or diabetes. That finding is what has moved it from an athletic metric to a health one.

Estimating it without a laboratory

The Cooper test, distance covered in twelve minutes, is the oldest field estimate and remains reasonable: VO2 max approximately equals distance in metres minus 504.9, divided by 44.73.

The Rockport walk test suits less fit populations and uses walking time over a mile plus heart rate. The multistage fitness test, the beep test, is widely used in team sports.

Resting estimates from heart rate variability and from wearables are convenient and considerably less accurate. All field tests have error bars in the region of 10% to 15% against laboratory measurement, and the wearable estimates are typically wider still.

Reading the number

Typical values for untrained adults run around 35 to 45 for men and 30 to 38 for women in their thirties, declining with age at roughly 10% per decade without training.

Endurance athletes reach 60 to 85, and the highest recorded values, above 90, belong to elite cross-country skiers and cyclists.

The health-relevant comparison is against age and sex norms rather than against athletes. Moving from the bottom fifth of the population distribution to the second fifth is associated with a larger mortality benefit than any subsequent improvement, which means the gains that matter most are available to the least fit.

Improving it

Both high intensity interval training and sustained moderate training improve VO2 max, and the evidence favours intervals for the rate of improvement per hour of training.

The classic protocol is four intervals of four minutes at 90% to 95% of maximum heart rate, with three minutes of active recovery between. It is well studied and it is genuinely hard.

Volume of easy training matters too, and the combination outperforms either alone. Improvements of 15% to 20% over a few months are typical in untrained people; trained athletes see far less, because they are closer to their genetic ceiling.

The limits of the measure

VO2 max sets a ceiling on aerobic performance and does not determine it. Two runners with identical values can perform very differently depending on their lactate threshold and their running economy.

Economy in particular explains a great deal. Some athletes use less oxygen at a given pace, which means they perform better than their VO2 max predicts, and it is trainable in ways that maximal capacity is not.

Genetics accounts for a substantial share of both the baseline value and the response to training. Some people improve considerably from a training programme and others barely at all, which is well documented and is worth knowing before treating a poor response as a failure of effort.

Where to go next

The VO2 Max question rarely arrives on its own. These are the ones that usually come with it:

Max Heart Rate Calculator — Four formulas, because 220 minus age is the worst of them.
Heart Rate Zone Calculator — All five training zones, with what each is for.
Race Time Predictor — Predict a race time from a result at another distance.
BMI Calculator — Body mass index with category and healthy weight range.

Sources

Uth et al., Eur J Appl Physiol 2004 (PubMed)

Not medical advice. This calculator gives a general estimate, not medical advice. It cannot account for your individual health, medical history, or medication. Talk to a qualified healthcare professional before acting on any result.

Frequently asked questions

How is VO2 max estimated without a lab?

The Uth-Sørensen method uses 15.3 × (maximum heart rate ÷ resting heart rate), which works because a low resting rate relative to maximum reflects a large stroke volume. Race-time methods, like Daniels and Gilbert's, infer it from the pace you can actually sustain.

What is a good VO2 max?

For a 30-year-old man, roughly 35 is below average, 45 is good and 55+ is excellent. For women the same descriptions sit about 7-8 points lower. Values decline about 10% per decade after 30 without training, and considerably less with it.

Can VO2 max be improved?

Yes, typically by 15-20% with consistent training, and more in someone starting from a sedentary baseline. High-intensity intervals raise it fastest; large volumes of easy aerobic work sustain it. The genetic component is substantial, so trainability varies widely.

Why does VO2 max matter for health?

Large cohort studies consistently find low cardiorespiratory fitness associated with higher mortality than smoking, diabetes or hypertension. It is a strong marker of overall physiological reserve, not just athletic ability.