What’s a good VO2 max by age? (and how to measure yours)

The shortlist

What counts as a good VO2 max

A good VO2 max is, simply, above the median for your age and sex, roughly the 80th percentile. The figure that matters is always relative to your band, because the bar drops steadily with age. Read your row, not a universal number.

For men, "good" is approximately 51 ml/kg/min in your twenties, 46 in your forties, 43 in your fifties and 40 in your sixties. For women, approximately 44, 40, 37 and 33 across the same bands. The median sits a few points lower in each case. Treat these as ranges, not decimals: the major fitness registries disagree by several ml/kg/min depending on how they screen for maximal effort, so anyone quoting your good number to one decimal place is overselling the precision.

One honest caveat the chart sites skip: the reference data itself disagrees. The widely cited FRIEND registry shifts by around five ml/kg/min depending on how strictly it screens for a true maximal effort, so two reputable charts can place the same person at the 60th percentile or the 75th. Use the number to find your rough band, not to litigate a single point. The good bands here follow Garmin’s published ratings, drawn from Cooper Institute data, while the medians come from FRIEND; re-test the same way each time so your own trend stays comparable.

Why the number is a survival statistic, not a vanity metric

The reason to care is not bragging rights. In a Cleveland Clinic study of more than 122,000 people, the least-fit had about five times the death rate of the elite-fit, a hazard ratio of 5.04, and the penalty for poor fitness was comparable to or worse than smoking, diabetes or coronary disease. A separate cohort of three-quarters of a million veterans found the same direction.

Two findings make this actionable. First, there was no upper limit: more fitness kept lowering risk with no plateau. Second, and more useful for most readers, the curve is steepest at the bottom. Moving from the least-fit quartile to merely above-average is associated with a large drop in mortality risk, on the order of the biggest single lever in preventive health. You do not need to be elite; you need to not be in the bottom group.

The age curve, and why a falling number is not destiny

VO2 max declines with age, slowly at first and then faster: a few percent per decade in your twenties and thirties, accelerating past 20% per decade after seventy. That is the default trajectory, and it is why a number that looked fine at forty can quietly slide into the risk zone by sixty.

But the decline is partly under your control. Training offsets a large share of it, and people well into their sixties have raised their VO2 max with structured work. The age curve sets the starting line, not the finish.

How to measure it: the watch versus the lab

Every wrist device estimates VO2 max from heart rate and motion during outdoor cardio. It is a model, not a measurement, and the gap shows. Independent validation puts the Apple Watch error near 7 ml/kg/min with a 13 to 16% error rate, and even the better-regarded Garmin estimate carries a few ml/kg/min of error with wide individual limits. Garmin’s own claim of 95% accuracy is optimistic against the independent data.

The practical rule: trust the trend, not the absolute. A watch is excellent for telling you whether your fitness is rising or falling month to month, and that trend is what you act on. For an accurate single number, a real baseline, a medical reason, or to settle whether your watch is wrong, a lab cardiopulmonary exercise test with a gas-analysis mask is the gold standard and runs roughly $100 to $300.

Which device to buy

If you want one device, a Garmin Forerunner 265 gives the most-validated estimate and the trend tracking most people actually need; buy it on sale. The Coros Pace 3 does the same job for $199 if budget leads. An Apple Watch is fine if you already own one, with the caveat that it is the least accurate of the group for this metric.

If you want the true number rather than an estimate, book a lab test. Chains like Fitnescity arrange a mask-based test near you from around $145, and some pair it with a DEXA body-composition scan in one visit. The sensible pattern for most readers: a watch for the monthly trend, one lab test for an honest baseline.

How to actually move it

Two ingredients raise VO2 max: a base of easy aerobic work and a weekly dose of hard intervals. The most-cited protocol, the Norwegian 4x4, four four-minute efforts near 90 to 95% of max heart rate, three times a week, raised VO2 max by about 7% in eight weeks, while matched-volume easy training did not. Most people see a measurable gain in six to twelve weeks.

If you want the full sequence of what to measure and fix before buying more, the Baseline Month guide and the Readiness Check put VO2 max in context with strength, blood pressure and the rest of the levers that move the number on the mortality charts.

Who should skip

Skip the chase for a perfect decimal from a wrist device; the error is too large for that, and a lab test is the answer if you need precision. If you are already above the 80th percentile, skip the obsession with going from high to elite, because the curve is flat up there and durability and avoiding injury matter more than one more point.

A watch is the wrong buy if you train mostly indoors or lift rather than run, because the estimate needs consistent outdoor cardio to calibrate. None of this is a medical workup: chest pain or breathlessness means see a physician, not buy a watch.

FAQ

What we read

• Kaminsky et al. (FRIEND, Mayo Clin Proc)Reference VO2 max norms by age and sex ->
• Mandsager et al. (JAMA Network Open)Low fitness carried about 5x mortality risk, with no upper ceiling ->
• Kokkinos et al. (JACC)Higher fitness, lower mortality across 750,000+ veterans ->
• Garmin / FirstbeatVO2 max rating bands by percentile ->
• PLOS OneApple Watch VO2 max validation: mean error about 6.9 ml/kg/min ->
• Helgerud et al.Norwegian 4x4 intervals raised VO2 max 7.2% in 8 weeks ->
• Fleg et al. (Circulation)VO2 max decline accelerates with age ->

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