How accurate is this?

Within ten to fifteen percent of a laboratory test, which means a two point change between tests tells you nothing. Track the trend across several.

Is a higher VO2 max always better performance?

It sets a ceiling but does not determine performance. Running economy and lactate threshold often separate athletes with identical VO2 max.

Health & Fitnessfitness

VO2 Max Calculator

VO2 max estimated from a field test. All three methods are regressions with roughly ten to fifteen percent error, so the useful comparison is against yourself over time rather than against a category boundary.

Also called: cooper test calculator, aerobic capacity.

Estimated VO2 max

46.84

46.84 ml/kg/min, which is above average for a 38 year old. That is 13.38 METs of aerobic capacity. The Cooper test requires a genuinely maximal twelve minute effort; pacing errors understate it.

In METs

13.38

Absolute VO2 in litres/min

3.37

How this is calculated

VO2 max is the maximum rate of oxygen uptake and the standard measure of aerobic capacity. Laboratory measurement needs a mask and a graded test to exhaustion; the field estimates here fit a regression to a submaximal or time-trial performance. The Cooper test is a hard twelve minute effort and is the most direct. All the estimates carry ten to fifteen percent error, so a change of two points between tests is inside the noise, and tracking the trend across several tests is more informative than any single number.

the Cooper regression from a 12 minute run, fitted on military recruits

d: Distance in metres

Worked examples

Each of these is asserted on every build. If a change to the engine ever moved one of these answers, the build would fail before the page could print it.

a 2,600 metre Cooper test

Method: Cooper 12 minute run
Distance covered in 12 minutes: 2,600 m
Age: 38
Resting heart rate: 58
Maximum heart rate: 0
Weight: 72 kg
Rockport walk time: 13 min
Sex: Male

Estimated VO2 max46.84

(2600 - 504.9) / 44.73

Open this example

the heart rate ratio method needs no exercise

Method: Resting heart rate ratio
Distance covered in 12 minutes: 2,600 m
Age: 38
Resting heart rate: 58
Maximum heart rate: 0
Weight: 72 kg
Rockport walk time: 13 min
Sex: Male

Estimated VO2 max47.85

boundary: 15.3 x 181.4 / 58

Open this example

Method and limits

What it assumes

A genuinely maximal effort for the Cooper test, which pacing errors easily spoil.

What it deliberately does not model

Field estimates carry ten to fifteen percent error against laboratory measurement.
Pacing, terrain, heat and motivation all affect the result more than fitness changes do week to week.
VO2 max is one component of endurance performance and not the whole of it.

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Frequently asked questions

How accurate is this?: Within ten to fifteen percent of a laboratory test, which means a two point change between tests tells you nothing. Track the trend across several.
Is a higher VO2 max always better performance?: It sets a ceiling but does not determine performance. Running economy and lactate threshold often separate athletes with identical VO2 max.