About the VO2 Max Calculator
VO2 max is the most oxygen your body can use per minute during hard exercise, measured in millilitres per kilogram of body weight. It is one of the best single signs of aerobic fitness. Measuring it properly needs a lab, a mask and a treadmill, so this calculator offers three well-known field estimates instead. The Cooper test uses the distance you cover running for 12 minutes, the Rockport test uses the time you take to walk one mile and your pulse at the end, and the resting heart rate method needs only your age and your pulse. The answer is shown in ml/kg/min and in METs.
Updated October 2026
How to use the VO2 Max Calculator
- 1Choose the test you did: Cooper run, Rockport walk or the resting pulse method.
- 2Enter the numbers for that test, such as distance covered or time and end pulse.
- 3Use the same units shown beside each box.
- 4Read your VO2 max estimate and the rough level it falls into.
- 5Repeat the same test every couple of months to follow your progress.
Picking the right test
The Cooper test is best if you already run and can safely give a maximal effort for 12 minutes. A running track makes the distance easy to count, and one lap of a standard track is 400 metres.
The Rockport walk is gentler and suits walkers and beginners, as long as you measure your pulse straight after finishing. The resting heart rate method is the easiest, but it is only a rough guide.
Making your test fair
- Test on flat ground in mild weather, not in strong wind or heat.
- Avoid heavy meals, caffeine and hard training for several hours before.
- Warm up for ten minutes, and cool down slowly afterwards.
- Repeat under the same conditions so changes in the number mean something.
What the number does and does not say
A higher VO2 max is linked with a lower risk of heart disease and earlier death, but a single estimate from a field formula can easily be off by 10 percent or more. It is better to watch the trend over months than to chase one value.
For heart rate numbers see the Max Heart Rate Calculator and the Target Heart Rate Calculator, and for pacing your runs try the Pace Calculator.
Features
- Three field methods in one place
- Result in ml/kg/min and METs
- Plain-language fitness level
- Sensible limits that catch typing mistakes
- Weight entered in kilograms, converted for you
- Everything is calculated on your device
Frequently asked questions
What is a good VO2 max?
For adults in their 20s and 30s, roughly 38 to 45 ml/kg/min is average and above 52 is excellent. Values fall with age, and women usually score a few points lower than men. Trained endurance athletes often reach 60 to 80.
How does the Cooper test work?
You run or run-walk as far as you can in exactly 12 minutes on a flat track, and the distance in metres goes into the formula (distance minus 504.9) divided by 44.73. It needs a hard effort, so warm up well and do not try it if you have heart or lung problems.
How does the Rockport walk test work?
You walk one mile as fast as you can without running, then take your pulse straight away. Your age, sex, weight, walking time and end pulse go into a regression formula. It suits people who prefer not to run and was designed for adults aged 30 to 69.
How accurate is the resting heart rate method?
It is the roughest of the three because it assumes a maximum heart rate from your age. A very low resting pulse, as many fit people have, can push the estimate high. Use it for a quick idea, not as a precise number.
What does METs mean?
One MET is the energy you use sitting at rest, about 3.5 ml of oxygen per kilogram per minute. Dividing your VO2 max by 3.5 gives your top MET level, which shows how many times harder than rest you can work.
How can I raise my VO2 max?
Regular aerobic training raises it, with the biggest gains in people starting from a low level. A mix of easy longer sessions and short hard intervals works well. Expect gains of 5 to 15 percent over a few months, with a ceiling set partly by your genes.