Fitness & Health

What's a Good VO2 Max by Age and Gender?

By IFCalculator September 19, 2026 8 min read

VO2 max is the amount of oxygen your body can use at full effort, measured in milliliters per kilogram of body weight per minute (ml/kg/min). A "good" score is judged against your age and sex, not against elite runners. For a man in his 30s, roughly 45 ml/kg/min is good; for a woman the same age, around 38 sits in the same band.

The number that matters is your own band. A 40-year-old man with a VO2 max of 42 and a 40-year-old woman with 35 are both sitting at "good" for their age and sex. Comparing your reading to a pro cyclist's 75 tells you nothing useful.

What is VO2 max and why is it measured in ml/kg/min?

VO2 max is the maximum volume of oxygen your body can take in and burn during hard exercise. It is reported per kilogram of body weight so people of different sizes can be compared fairly. The figure captures your whole oxygen chain at once: lungs, heart, blood, and how well muscles pull oxygen from it. That breadth is why it is treated as the single best measure of aerobic fitness.

One MET equals 3.5 ml/kg/min, so a VO2 max of 35 is exactly 10 METs. Clinicians often talk in METs; fitness apps talk in ml/kg/min. They are the same measurement wearing different labels.

What counts as a good VO2 max for my age and sex?

A good VO2 max is one that lands in roughly the top third for your age band and sex. Because scores drop with age and average lower in women, the thresholds shift with both. The table below gives the approximate floor for each rating in ml/kg/min, drawn from the Cooper Institute reference data that the American College of Sports Medicine publishes.

Age	Sex	Fair	Good	Excellent	Superior
20–29	Men	42	47	51	56+
20–29	Women	36	41	44	49+
30–39	Men	41	45	49	53+
30–39	Women	34	38	42	46+
40–49	Men	38	42	46	51+
40–49	Women	31	35	39	44+
50–59	Men	35	39	43	48+
50–59	Women	28	31	35	40+
60+	Men	31	35	39	44+
60+	Women	25	29	32	37+

Read the table as band floors. A 45-year-old man at 43 is comfortably "good," and one point of extra fitness would tip him into "excellent." The median 45-year-old man sits near 38 and the median woman near 27, so anything above those is above average for the group. Elite endurance athletes live in another zone entirely, with male pros over 70 and elite women in the 60s.

Why is a good VO2 max lower for women than for men?

Women average about 20 to 25% lower than men at every age, and the gap is physiological rather than a matter of effort. Men carry a larger heart and lungs, more hemoglobin to ferry oxygen, and more lean muscle on average. That is why a 38 for a 35-year-old woman is the same fitness verdict as a 45 for a man her age. The bands already account for it.

Body weight sits in the denominator, so losing fat mass can raise your ml/kg/min figure even when the actual liters of oxygen you move stay flat. That is one reason two people with identical hearts can post different numbers.

How fast does VO2 max decline with age?

VO2 max peaks in the late teens to late twenties, then falls about 10% per decade in sedentary adults from around age 25 to 30. Regular endurance training roughly halves that to about 5% per decade. Across a lifetime the drop is steep: VO2 max falls close to 46% between ages 20 and 70, which is why the "good" threshold at 60 is well below the one at 25.

You cannot stop the decline, but you can flatten its slope. The person who keeps training in their 50s often holds a VO2 max that a sedentary 35-year-old would envy. Half the age-related loss is really a training loss.

How can I estimate my VO2 max without a lab?

The lab standard is a graded treadmill or bike test with a mask measuring the gas you breathe, but you rarely need one. Field tests get you within a few points, and the classic is the Cooper 12-minute run, designed by Dr. Kenneth Cooper for the US Air Force in 1968. It correlates with lab treadmill results at about r = 0.90 in trained runners.

Warm up, then set a 12-minute clock — pick a flat track or a measured loop so you can log distance accurately.
Cover as much ground as you can in 12 minutes — hold a hard but steady pace; going out too fast wrecks the second half.
Record the distance in meters — a phone GPS or a marked 400 m track both work.
Apply the Cooper formula — VO2 max = (distance in meters − 504.9) ÷ 44.73. Run 2,600 m and you get about 47 ml/kg/min.
Check it against your age and sex band — a 30-year-old man at 47 is sitting in "good," a hair under "excellent."

If running flat out is not for you, the Rockport one-mile walk test is gentler: walk a mile as fast as you can, then plug your time, ending heart rate, weight, age, and sex into its formula. You can run either test and get a banded result in seconds. Fitness watches from Garmin and Apple estimate the same number from your pace and heart rate, which is fine for tracking the trend even if it is not a diagnosis.

Do not treat one watch reading as fixed truth. Estimates swing with sleep, heat, hydration, and how the device caught your last few runs. Watch the direction over weeks, not a single day's number.

What does a higher VO2 max actually do for my health?

Beyond athletic performance, VO2 max is one of the strongest predictors of how long you live. A 2018 study of 122,007 adults in JAMA Network Open found that higher cardiorespiratory fitness was tied to lower all-cause mortality with no upper limit to the benefit. The least-fit group faced roughly five times the death risk of the elite-fit group.

In that data, fitness outranked smoking, diabetes, and high blood pressure as a mortality predictor. As a rough guide, each 1-MET gain (about 3.5 ml/kg/min) is linked to a 10 to 15% lower risk of dying. Few numbers on a health chart carry that kind of weight.

The practical takeaway is that VO2 max is trainable, and even modest gains move the risk needle. Steady aerobic base work plus short, hard intervals is the reliable recipe. If you build sessions around heart-rate zones, the Karvonen target heart rate calculator sets those zones from your resting heart rate, and a run pace calculator turns them into the paces you actually hold on the road.

Frequently asked questions

Is 40 a good VO2 max?

It depends on your age and sex. For a woman over 40 or a man over 50, a 40 is good to excellent. For a man in his 20s, 40 sits only at "fair," because the median for that group is closer to 48. Always read your number against your own band.

What is a good VO2 max for a 50-year-old?

For a 50-year-old man, about 39 ml/kg/min or higher counts as good, with 43 and up excellent. For a 50-year-old woman, roughly 31 is good and 35 is excellent. The median at that age is near 33 for men and 23 for women, so both thresholds sit above average.

How accurate is my Apple Watch or Garmin VO2 max?

Consumer wearables usually land within a few points of a lab test and are reliable for tracking your trend over time. They are estimates built from pace and heart-rate data, not clinical measurements, so treat a single reading loosely and pay attention to the direction over several weeks.

Can I improve my VO2 max at any age?

Yes. VO2 max responds to training across the lifespan, and consistent aerobic work plus interval sessions can raise it at 50 or 70, not just in your 20s. Training also cuts the age-related decline from about 10% per decade to roughly 5%, so improvement and preservation happen together.

What is a good VO2 max for a woman?

It shifts with age. A woman in her 20s is in the good band around 41, in her 30s around 38, in her 40s around 35, and over 50 around 31. Women's scores run 20 to 25% below men's at every age because of differences in heart size, hemoglobin, and lean mass, and the bands already build that in.

Why does losing weight raise my VO2 max score?

VO2 max is measured per kilogram of body weight, so weight sits in the denominator of the calculation. Drop fat mass and the same absolute oxygen uptake gets divided by a smaller number, nudging the ml/kg/min figure up even if your heart and lungs have not changed at all.

What is the difference between VO2 max in ml/kg/min and METs?

They measure the same thing on different scales. One MET equals 3.5 ml/kg/min, so you convert by dividing or multiplying by 3.5. A VO2 max of 42 ml/kg/min is 12 METs. Clinicians tend to use METs during stress tests, while fitness apps report ml/kg/min.

The honest way to use VO2 max is to find your age-and-sex band, get a rough number from a field test, and then watch it climb. Run the Cooper or Rockport test through the VO2 max field test calculator to see exactly where you land and how far you sit from the next band up.