VO2 Max Calculator

Estimate your VO2 max from four field tests — resting heart rate, the Cooper 12-minute run, the Rockport walk, or a 1.5-mile run — with a rating for your age.

Sex
Age years
Resting heart rate bpm
Distance covered in 12 minutes meters
Weight
1-mile walk time
min sec
Heart rate at the finish bpm
Estimated VO2 max
—mL/kg/min Enter your details

Field-test estimates track lab-measured VO2 max within a few points. The running tests need an all-out effort — warm up first, and skip them if you have heart or joint concerns. The resting-HR method is the gentlest but least precise.

VO2 max — maximal oxygen uptake — is the single best measure of aerobic fitness: how much oxygen your heart, lungs, and muscles can move and use when you’re working flat out. This calculator estimates it from any of four published field tests, then rates the result against norms for your age and sex.

The four methods

Resting heart rate (no exercise needed). Uth and colleagues (2004) found VO2 max ≈ 15.3 × (HRmax ÷ HRrest), using the Tanaka formula (208 − 0.7 × age) for maximum heart rate. Measure your resting pulse first thing in the morning for the best input.

Cooper 12-minute run. Run or walk as far as you can in 12 minutes on a track: VO2 max = (distance in meters − 504.9) ÷ 44.73. Dr. Kenneth Cooper built this test for the US Air Force in 1968, and it remains a fitness-testing staple.

Rockport 1-mile walk. Walk one mile as fast as possible and take your heart rate at the finish. The Kline (1987) regression uses your weight, age, sex, time, and finish heart rate — designed for people who can’t yet test at a run.

1.5-mile run. A timed 1.5-mile run: VO2 max = 483 ÷ (time in minutes) + 3.5. Used by many military and police fitness programs.

Reading your result

Ratings use age- and sex-specific norms: an identical 40 mL/kg/min can be excellent for a 55-year-old woman and merely fair for a 25-year-old man. Elite endurance athletes reach the 70s and 80s; the highest recorded values sit around 90.

Getting a valid test

The running tests only estimate well when the effort is genuinely maximal — pace evenly, and don’t test without a warm-up. If you’re new to exercise, over 45 with risk factors, or have heart problems, start with the walk or resting methods and talk to a clinician before all-out testing.

Frequently asked questions

What is VO2 max?

VO2 max is the maximum volume of oxygen your body can use per minute during all-out exercise, measured in mL of oxygen per kg of body weight per minute. It's the standard gauge of cardiorespiratory fitness and a strong predictor of long-term health.

Which test method is most accurate?

True VO2 max needs a lab test with a breathing mask on a treadmill. Of the field tests here, the running tests (Cooper 12-minute and 1.5-mile) track lab values closest because they demand a maximal effort; the Rockport walk suits less-trained people; the resting-heart-rate method is easiest but least precise.

What is a good VO2 max?

It depends on age and sex. For men in their 20s, roughly 43–52 mL/kg/min rates as good-to-excellent; for women in their 20s, about 33–42. Values decline naturally with age — the calculator rates your result against norms for your age group.

Can I improve my VO2 max?

Yes. Consistent aerobic training — especially interval sessions near maximum effort mixed with easy endurance volume — reliably raises VO2 max, with most improvement in the first months of training. Genetics set the ceiling, but nearly everyone can move toward theirs.

References