VO2 Max Calculator

Estimate VO2 max from a Cooper 12-minute run, Rockport walk, resting heart rate, 1.5-mile run or race time, and see your percentile for age and sex.

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About this tool

What is the VO2 Max Calculator?

The VO2 Max Calculator estimates your maximal oxygen uptake, the most oxygen your body can use per kilogram per minute during all-out exercise. It is the standard measure of cardiorespiratory fitness. You choose the test you did and the page applies the matching published equation: the Cooper 12-minute run, the Rockport one-mile walk, the resting-to-maximum heart rate ratio, the 1.5-mile run or a race result through the Daniels VDOT model.

Each estimate comes with METs and a percentile for your age and sex from the FRIEND registry, a database of laboratory treadmill tests from apparently healthy adults in the United States, updated in 2022. A table shows the values at the 5th to 95th percentiles for your age group so you can see what the next band would take.

All calculations run in your browser. No test data is stored or sent anywhere.

  • Five field methods: Cooper, Rockport, heart rate ratio, 1.5-mile run, race VDOT
  • FRIEND 2022 percentiles by age decade and sex
  • METs alongside mL/kg/min
  • Target Cooper distance for the next band
  • Metric or US units
  • Runs in your browser; nothing is stored
Read the guide: Estimating VO2 Max Without a Lab: Cooper, Rockport and VDOT

How to use the VO2 Max Calculator

  1. Pick the test you did from the Test menu, and enter your age and sex.
  2. Cooper: enter the distance you ran in 12 minutes, in metres or miles. Rockport: enter your walk time, heart rate at the finish and body weight.
  3. Resting heart rate: enter your morning resting pulse and, if you know it, your measured maximum heart rate.
  4. 1.5-mile run or race: enter the finish time (and race distance), as mm:ss or h:mm:ss.
  5. Read the VO2 max, METs and percentile, and check the reference table for your age group.

Worked examples

Cooper test

Input

Male, 35, 2,400 m in 12 minutes

Output

VO2 max 42.4 mL/kg/min, 12.1 METs, about the 61st percentile

(2400 − 504.9) / 44.73 = 42.4. The 60th percentile for men in their 30s is 41.9, so he sits just above it; the page notes that 2,379 m reaches that line.

Rockport walk

Input

Female, 45, 150 lb, 16:00, heart rate 125

Output

VO2 max 32.1, about the 78th percentile

132.853 − 0.0769 × 150 − 0.3877 × 45 − 3.2649 × 16 − 0.1565 × 125 = 32.1. Walking tests are useful for people who cannot or should not run.

Race result

Input

Female, 34, 5 km in 25:00

Output

VDOT 38.3, about the 85th percentile

The Daniels model credits her race speed and the fact that a 25-minute effort is held at about 94% of VO2 max.

Background and insight

VO2 max is measured in a lab by analysing breath on a treadmill or bike while the workload rises until you cannot continue. Field tests estimate it from something easier to record. In 1968 Kenneth Cooper showed that the distance 115 US Air Force men covered in 12 minutes correlated with their treadmill VO2 max (r = 0.90), giving VO2 max = (metres − 504.9) / 44.73. The Rockport walking test of Kline and colleagues (1987) suits people who should not run: walk a mile as fast as possible and use time, finishing heart rate, age, weight and sex.

Uth and colleagues in Copenhagen (2004) found that the ratio of maximum to resting heart rate predicted VO2 max in trained men: 15.3 × HRmax / HRrest. It needs no exercise test if you know your maximum heart rate; otherwise the page uses 208 − 0.7 × age from Tanaka, Monahan and Seals (2001), which adds error. Jack Daniels and Jimmy Gilbert built the VDOT model from the oxygen cost of running speed and the fraction of VO2 max a runner can hold for a given time. A race-derived VDOT is the "effective" VO2 max that also reflects running economy, which is why it matches race tables better than lab values.

Why care? A 2009 meta-analysis by Kodama and colleagues in JAMA found that each 1-MET higher fitness (3.5 mL/kg/min) was associated with about 13% lower all-cause mortality. A 2018 Cleveland Clinic study of over 120,000 treadmill tests found no upper limit to the benefit. VO2 max falls with age, roughly 10% per decade after 30 in inactive adults, but training slows that decline.

Common use cases

  • Benchmarking fitness

    Get a single number to compare against age norms and track over months of training.

  • Setting running paces

    Runners use race-based VDOT to set easy, threshold and interval paces.

  • Low-impact testing

    Older or deconditioned adults can use the Rockport walk instead of a maximal run.

  • Seeing what a smartwatch number means

    Compare a watch estimate with a field test and with population percentiles.

Tips and limitations

  • Warm up for 10 minutes before a timed test and run on a flat, measured track in calm weather.
  • Retest under the same conditions; changes of 2 to 3 mL/kg/min are within the error of field tests.
  • The heart rate ratio method is the least reliable when maximum heart rate is estimated from age; a measured maximum improves it.
  • Race VDOT reflects economy and pacing as well as aerobic power, so it can differ from a lab VO2 max.
  • Maximal tests are hard. If you have heart, lung or joint problems, or have been inactive, check with a doctor and choose the walk test.

Frequently asked questions

What is a good VO2 max for my age?

It depends on age and sex. In the FRIEND 2022 data the median for men in their 30s is 38.6 mL/kg/min and for women in their 30s 28.3. Values above the 80th percentile, about 48.7 for men and 36.2 for women in that decade, count as high fitness.

How accurate are field tests compared with a lab?

Expect errors of roughly 3 to 5 mL/kg/min for most people. The Cooper test is reasonably accurate for people who pace a 12-minute effort well; the heart rate ratio method can be off by more if your maximum heart rate is estimated.

Is my smartwatch VO2 max accurate?

Watches estimate VO2 max from heart rate and pace during runs and tend to be within about 5 mL/kg/min on average, with bigger errors for some individuals. Use the trend rather than the absolute number.

What is VDOT and how is it different from VO2 max?

VDOT is Jack Daniels' race-derived effective VO2 max. It combines aerobic capacity with running economy, so two runners with the same lab VO2 max can have different VDOTs. It is designed for setting training paces.

How can I improve my VO2 max?

Regular endurance training, including some intervals at hard intensity, raises VO2 max in most people by 10 to 20% over a few months. Losing body fat also raises the per-kilogram value.

What are METs?

A MET is the resting oxygen use of 3.5 mL/kg/min. A VO2 max of 42 mL/kg/min equals 12 METs, meaning your maximum aerobic output is 12 times rest.

Do I need to know my maximum heart rate?

Only for the heart rate ratio method. If you leave it blank the page estimates it as 208 − 0.7 × age, which can be off by 10 beats per minute or more.

Is there an in-depth guide to the VO2 Max Calculator?

Yes. “Estimating VO2 Max Without a Lab: Cooper, Rockport and VDOT” covers the background, how it works, common pitfalls and worked examples. Read the full guide.

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