What Is a Good VO2 Max?

What is a good VO2 max? It is a score that is favorable for your age, sex, and testing method, not one universal cutoff. Use a consistent chart or device to compare your result and pay more attention to the trend than a single category.

What VO2 Max Actually Measures

VO2 max is the maximum rate at which your body can take in, transport, and use oxygen during intense exercise, expressed in milliliters of oxygen per kilogram of body weight per minute (ml/kg/min). It's a ceiling, not a pace — a measure of how much aerobic "engine" you have, not how efficiently you use it on a given day. Two runners with the same VO2 max can post very different race times depending on running economy and pacing.

Because it's normalized to body weight, VO2 max lets you compare a 130-pound runner to a 220-pound rower on the same scale. It's driven mostly by cardiac output — how much blood your heart pumps per beat — and how well your muscles extract oxygen from that blood. Training raises both.

What Is a Good VO2 Max for Your Age and Sex

There's no single cutoff for "good." Most VO2 max charts break scores down by age and sex, since both shift the baseline substantially. Men typically post higher numbers than women at the same age and fitness level, largely due to higher hemoglobin concentration, larger heart volume, and lower average body fat percentage. VO2 max tends to decline with age, although regular training can slow that decline.

The table below is an approximate synthesis of common public fitness classifications. Cutoffs differ by source and test method, so use the chart for orientation rather than diagnosis. "Good" or "above average" is a realistic target for most healthy, active adults; "excellent" is where dedicated endurance athletes tend to sit.

Age	Sex	Below Average	Average	Good	Excellent
20–29	Men	Under 39	39–45	46–51	52+
20–29	Women	Under 30	30–36	37–41	42+
30–39	Men	Under 35	35–41	42–47	48+
30–39	Women	Under 27	27–33	34–38	39+
40–49	Men	Under 32	32–37	38–43	44+
40–49	Women	Under 25	25–30	31–35	36+
50–59	Men	Under 29	29–34	35–40	41+
50–59	Women	Under 22	22–27	28–32	33+
60+	Men	Under 25	25–30	31–36	37+
60+	Women	Under 19	19–24	25–29	30+

Treat a category as a band, not a grade — landing a couple of points either side of a line doesn't mean much on its own. The direction you're trending over months matters more than which column you sit in today.

Endurance-trained athletes can score far above population norms, but an elite value is not necessary for useful cardiorespiratory fitness. Compare against the same classification over time.

How VO2 Max Is Tested: Lab vs. Wearable Estimates

The gold-standard test happens in an exercise physiology lab: you run or cycle through a graded protocol — intensity rising every minute or two — while breathing through a mask connected to a metabolic cart that measures oxygen consumption and carbon dioxide output directly. The test continues to voluntary exhaustion while clinicians assess oxygen uptake and other criteria. Not every test produces a clear plateau, so laboratories use several criteria to identify a maximal result.

Almost nobody trains with that hardware on, so most people never get a direct measurement. Wearables — Apple Watch, Garmin, Polar, and similar devices — estimate VO2 max indirectly instead, tracking your heart rate response during runs or walks at various paces and running that data through a regression model that infers where your oxygen ceiling probably sits, without ever measuring gas exchange. Garmin and Polar both lean on a licensed algorithm (Firstbeat); Apple computes its own "Cardio Fitness" score with a comparable approach.

Why Wearable Estimates Drift From Lab Numbers

Wearable estimates track trend well but aren't lab-accurate, and it helps to know why before treating the number as gospel. GPS pace error, terrain, wind, heat, hydration, and how well the optical heart rate sensor reads your wrist all feed into the estimate — run the same route on a hot, humid day and a cool one, and your watch may report a different number even though your fitness hasn't changed at all.

The estimates also need a real spread of paces and heart rates to calibrate against. If most of your runs sit in one easy zone, the algorithm has less data to extrapolate the top end from, and the reading can come in low. Outdoor GPS runs tend to produce more reliable estimates than treadmill sessions, where the watch often has to guess pace instead of measuring it directly. None of this makes the wearable number useless — a rising trend over months is a genuinely good signal that your aerobic fitness is improving, even if the absolute value sits a few points off what a lab test would show.

How to Use Your VO2 Max Number

The score itself doesn't train anything — what raises it is a mix of easy aerobic volume and hard interval work near or above your current threshold, sustained over months. Training from home doesn't rule this out: structured interval sessions, like 4-minute hard efforts with equal recovery or shorter 30-on/30-off rounds, are a time-efficient way to move the number, layered on a base of easier steady-state cardio. I use Workout Timer to run those interval sessions — it's an interval timer and workout tracker for iPhone and Apple Watch with Tabata, HIIT, EMOM/AMRAP-style custom, Strength, Bodyweight, and Core templates, plus session history to see what you've actually logged week to week.

For the specific session structures and progression that move VO2 max over weeks rather than a single workout, see our guide on how to improve your VO2 max.

FAQ

What is considered a good VO2 max for my age?

"Good" means landing in the above-average-to-excellent range for your specific age and sex bracket, not one fixed number. A 25-year-old man in the mid-40s ml/kg/min and a 55-year-old woman in the high-20s are both sitting in a comparably strong spot relative to their group.

What's a normal VO2 max for an average adult?

For a moderately active adult, "average" typically falls in the mid-30s to low-40s ml/kg/min for men and mid-20s to mid-30s for women, depending on age. Sedentary adults often score below these ranges, while a few months of regular training tends to push people into the "good" band.

Can I improve my VO2 max, or is it mostly genetic?

Genetics set your ceiling, but most people are nowhere near it. Structured interval training combined with easy aerobic work can improve VO2 max, but the size and timing of the response vary with baseline fitness, program, and recovery.

Is my Apple Watch or Garmin VO2 max estimate accurate?

It's a reasonable trend indicator, not a lab-accurate number — expect it to be off by a few points depending on run conditions, sensor quality, and how varied your training paces are. Watch the direction over months rather than fixating on any single reading.

Does VO2 max matter if I'm not an athlete?

Yes. It's one of the stronger general markers of cardiorespiratory fitness and tracks with long-term health outcomes independent of sport performance. You don't need an elite number — just a trend moving toward "average" or "good" for your age rather than away from it.