VO2 max is the maximum rate at which your body can take in and use oxygen during all-out exercise, measured in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). It's the single best lab marker of aerobic (cardiorespiratory) fitness.

How is VO2 max estimated without a lab?

Field tests predict it from performance. The Cooper test uses how far you run in 12 minutes; the heart-rate ratio method uses your maximum heart rate divided by your resting heart rate. Both are estimates that correlate with, but don't replace, a graded lab test.

What is a good VO2 max?

It depends on age and sex, but as a rough adult guide: under ~30 ml/kg/min is poor, the high 30s is good, the high 40s is excellent, and 54+ is superior. Elite endurance athletes often exceed 60–70 ml/kg/min.

How can I improve my VO2 max?

Regular aerobic training raises it — especially a mix of longer steady efforts and higher-intensity intervals near your max heart rate. Consistency over months matters most; gains are largest when you start from a lower base.

How accurate are these estimates?

Field estimates are typically within a few ml/kg/min of a lab result for most people, but pacing, motivation, heat, and an inaccurate resting or max heart rate all add error. Treat the number as a ballpark and track changes over time rather than a single figure.

VO₂ Max Calculator

Estimate your VO₂ max — the gold-standard marker of aerobic fitness — from a Cooper 12-minute run or from your resting and maximum heart rate, then see where it lands on the general adult fitness scale.

How it works

VO₂ max is the maximum volume of oxygen your body can use per minute, normalised to body weight (ml/kg/min). A true reading needs lab gas-exchange testing, but two field methods predict it well:

Cooper 12-minute run: VO₂ max = (distance in metres − 504.9) ÷ 44.73. Run or walk as far as you can in 12 minutes on a flat course.
Heart-rate ratio (Uth–Sørensen): VO₂ max ≈ 15.3 × (max heart rate ÷ resting heart rate). Take your resting pulse first thing in the morning for the best result.

If you don't know your maximum heart rate, the calculator can estimate it from your age with the Tanaka formula (208 − 0.7 × age), which is more accurate across ages than the old 220 − age rule.

Worked example

Cooper run: covering 2,400 m in 12 minutes gives VO₂ max = (2400 − 504.9) ÷ 44.73 ≈ 42.4 ml/kg/min, which falls in the Good band.

Heart rate: with a maximum heart rate of 190 and a resting heart rate of 60, VO₂ max ≈ 15.3 × (190 ÷ 60) ≈ 48.5 ml/kg/min — in the Excellent range.

VO₂ max fitness categories

A general adult guide to VO₂ max in ml/kg/min. These bands shift with age and sex — younger people and men tend to sit higher — so use them as a broad reference, not a strict standard:

Category	VO₂ max (ml/kg/min)
Poor	below 30
Fair	30–37
Good	38–45
Excellent	46–53
Superior	54+

Approximate general-adult ranges; age- and sex-specific norm tables (e.g. Cooper Institute) give more precise percentiles.

Interpreting your number

A higher VO₂ max means your heart, lungs, and muscles deliver and use oxygen more effectively, which underpins endurance and is linked to better long-term health. Rather than chasing a single figure, track how yours trends over months of training. To put the heart-rate inputs in context, see the Max Heart Rate Calculator and the Heart Rate Zone Calculator.

Frequently asked questions

What is VO2 max?: VO2 max is the maximum rate at which your body can take in and use oxygen during all-out exercise, measured in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). It's the single best lab marker of aerobic (cardiorespiratory) fitness.
How is VO2 max estimated without a lab?: Field tests predict it from performance. The Cooper test uses how far you run in 12 minutes; the heart-rate ratio method uses your maximum heart rate divided by your resting heart rate. Both are estimates that correlate with, but don't replace, a graded lab test.
What is a good VO2 max?: It depends on age and sex, but as a rough adult guide: under ~30 ml/kg/min is poor, the high 30s is good, the high 40s is excellent, and 54+ is superior. Elite endurance athletes often exceed 60–70 ml/kg/min.
How can I improve my VO2 max?: Regular aerobic training raises it — especially a mix of longer steady efforts and higher-intensity intervals near your max heart rate. Consistency over months matters most; gains are largest when you start from a lower base.
How accurate are these estimates?: Field estimates are typically within a few ml/kg/min of a lab result for most people, but pacing, motivation, heat, and an inaccurate resting or max heart rate all add error. Treat the number as a ballpark and track changes over time rather than a single figure.

Related calculators

Disclaimer. This is an estimate for general information only, not a lab measurement or medical advice. Consult a qualified professional before strenuous fitness testing, especially if you have any health concerns.