VO2max is the most oxygen your body can take in and use per minute, divided by your weight. It sets the ceiling of your aerobic engine. It does not set your result on Saturday.
Two riders with the same VO2max can finish minutes apart. The ceiling says how much oxygen you can process at absolute maximum; the race is decided by what fraction of that ceiling you can hold for an hour, which is a different quality with a different name: your threshold.
This is why a rider can add nothing to their VO2max for three seasons and still get faster every year.
VO2max is the trainable quality that moves soonest. Six to eight weeks of properly spaced intervals shift it measurably in someone who was not doing them. After that the curve flattens hard, and most of the improvement available to a trained cyclist is in threshold and durability instead.
The riders who gain the most are the ones who have never done structured intervals. If that is you, the number below is about to move.
A real VO2max needs a mask, a gas analyser and a ramp to exhaustion. Everything else, including this page and including your watch, is an estimate built from something easier to measure.
That is not a reason to ignore the estimate. It is a reason to use it the way estimates are useful: to track your own direction over months, not to compare your figure against a friend to one decimal place.
Every route on this page is an estimate from a published equation, and each one is named in the panel and cited at the bottom. If a calculator does not tell you which equation it used, it is not telling you what its number means.
This is the most asked question about VO2max, and the honest answer has two halves. The estimate is decent at tracking you over time and poor at telling you your absolute number.
Your watch never measures oxygen. It watches the relationship between the power or pace you produce and the heart rate it costs you, and it infers a VO2max from how favourable that relationship is. Firstbeat Analytics, the engine inside Garmin, works from exactly that.
That method has a consequence most riders discover the hard way: anything that moves your heart rate without changing your fitness moves your VO2max estimate. Heat moves it. Poor sleep moves it. Caffeine moves it. A chest strap replaced by a wrist sensor moves it. Three days of illness move it several points, and your aerobic engine did not change in three days.
It also needs the right kind of ride to update at all. Steady outdoor efforts with a reliable heart rate signal are what it wants. A ride full of traffic lights, a crit, or an indoor session in a hot room will either be ignored or will push the estimate the wrong way.
So the device number is worth watching as a line, not as a value. If it has drifted down over two months of consistent training, something real is probably happening. If it dropped four points after a heatwave weekend, nothing happened.
| Your device | Heart rate against pace or power, ride after ride | Tracks your direction well; absolute value drifts with heat, sleep, illness and sensor |
| This page, from FTP | One published equation from your hour power and your weight | Cycling-specific; only as current as the FTP you typed in |
| This page, from heart rates | The ratio between your maximum and resting heart rate | No test needed; sensitive to how honestly you know those two numbers |
| A laboratory test | Expired gas measured through a mask on a ramp to exhaustion | The actual measurement; everything above is an estimate of this |
Most VO2max tables you will find describe the general population, which is why they flatter anyone who rides a bike. These describe cyclists who train with a structured plan, which is a much harder room.
The panel above compares you against these same columns once you enter your age and sex.
| Group | 25% | 50% | 75% | 90% |
|---|---|---|---|---|
| Men 18–29 | 50.8 | 58.3 | 70.4 | 82.4 |
| Men 30–39 | 46.3 | 55.3 | 62.8 | 71.9 |
| Men 40–49 | 46.3 | 55.3 | 61.3 | 68.9 |
| Men 50–59 | 41.8 | 49.3 | 56.8 | 64.4 |
| Men 60+ | 37.3 | 46.3 | 53.8 | 58.3 |
| Women 18–29 | 43.0 | 56.6 | 68.6 | 73.1 |
| Women 30–39 | 37.0 | 49.1 | 58.1 | 70.1 |
| Women 40–49 | 41.5 | 52.1 | 59.6 | 67.1 |
| Women 50–59 | 23.5 | 37.0 | 41.5 | 58.1 |
The median for men between 30 and 50 lands at 55 ml/kg/min, and it does not move across those two decades. The same flat stretch shows in the power data it comes from.
The spread inside one decade dwarfs the gap between decades. Among men aged 40 to 49 the 25th to 90th percentile runs 46 to 69 ml/kg/min. That 23-point range is wider than the entire decline from the twenties to the sixties.
The top of the youngest male group, 82 ml/kg/min, sits in professional territory and should be read with that in mind: it is the 90th percentile of a self-selected group of people who train with an app, not of cyclists in general.
The female groups above 50 are small, and the 50-59 row is visibly noisy. Treat those four figures as indicative rather than as a target.
Methodology: these percentiles are converted, not measured. We do not store a VO2max for our cyclists; we store FTP and weight. The table is the power-to-weight distribution of our riders, measured on 4 September 2026, passed through the Hawley & Noakes equation cited below. Because that conversion is monotonic, the percentile is preserved exactly: the rider at the 60th percentile of W/kg is at the 60th here. Weight enters the conversion only through a second term worth 7.9 ml/kg/min at 55 kg and 4.8 at 90 kg, so the table is computed at a reference weight of 75 kg for men and 62 kg for women and moves by about a point across the plausible range. One figure per rider, the most recent. Two biases worth stating: these are people training with a structured app, not the general population, and the female groups are small enough that their percentiles should be read as indicative.
VO2max improves when you spend time at or near it, and the limiting factor is almost never willingness. It is recovery. Intervals at this intensity are only productive if you arrive at each one able to hit the target, which means the session that leaves you destroyed on Tuesday costs you the one on Thursday.
The format with the most evidence behind it is unglamorous: three to five efforts of three to five minutes, hard enough that you could not hold the pace for eight, with recoveries roughly as long as the efforts. Two of those sessions a week is a heavy dose for most riders. One is enough for many.
The rest of the week does more work than the intervals do. The aerobic base that lets you repeat those sessions is built at an intensity where you can still hold a conversation, and most riders who stall on VO2max are not doing too few intervals, they are riding the easy days too hard to absorb the ones that matter.
If your number came out lower than you hoped, the useful question is not which session to add. It is whether the last six weeks contained any session you completed exactly as written.
Four things this page cannot do, said plainly, because every one of them is a way a number like this gets misread.
It is not a laboratory measurement. Every route here is a published estimate, and estimates carry a real error band around them. Treat a three-point difference as noise.
It will not predict your race. VO2max sets the ceiling; results are decided by the fraction of it you can hold, by your durability late in a long day, and by how you ride. Riders beat riders with higher numbers every weekend.
It is not a medical assessment. A VO2max that has fallen sharply for no training reason is worth a conversation with a doctor, not a recalculation here.
The FTP route is only as current as the FTP you enter. A figure from March and a weight from this morning describe a cyclist who does not exist.
Both routes use published, peer-reviewed equations. Here they are, so you can check what the number is built on.
What riders ask before and after they see the number.
Good at direction, weak at absolute value. Your watch never measures oxygen: it infers VO2max from the heart rate cost of the power or pace you produce, so anything that moves heart rate without changing fitness moves the estimate. Heat, poor sleep, illness, caffeine and a change of heart rate sensor all shift it by several points. Watch the line over two months and ignore any single week.
Through Firstbeat Analytics, which looks at the relationship between your external effort and your heart rate response during a ride and infers how much oxygen your body must be processing. It needs steady efforts and a reliable heart rate signal to update, which is why a stop-start ride, a criterium or a hot indoor session often produces no update or a misleading one.
Usually the estimate is moving, not your fitness. The common causes are heat, a run of poor sleep, an infection, dehydration, or switching from a chest strap to a wrist sensor. Real aerobic decline takes weeks of reduced training and shows as a slow drift, not a four-point drop after one weekend. If it has fallen steadily through two months of consistent training, that is worth taking seriously.
You can estimate it, which is what this page and your watch both do. A true measurement requires expired gas analysis through a mask during a ramp to exhaustion. The published estimates are accurate enough to track your own progress over months and not accurate enough to rank you against another rider to one decimal place.
Among our cyclists, the median man between 30 and 50 sits at 55 ml/kg/min and the median woman between 30 and 50 sits between 49 and 52. Anything above the 75th percentile of your group is strong for someone who is not racing professionally. The table above gives the full distribution by age and sex, which is more useful than a single median because the spread within one decade is wider than the gap between decades.
No, and the gap is usually five to ten percent in favour of running for the same person, because running recruits more muscle mass. If your watch reports one figure from runs and another from rides, both can be right. Compare cycling numbers with cycling numbers.
A cyclist who has never done structured intervals can move it meaningfully in six to eight weeks. A cyclist with years of consistent training will find it close to its ceiling, and their gains will come from threshold and durability instead. The honest answer depends almost entirely on which of those two you are.
For predicting how you will ride, no. FTP tells you the power you can hold for around an hour, which is what a long climb or a hard group ride actually demands. VO2max tells you the ceiling that FTP is a fraction of. Raising the ceiling only helps if you then train the ability to use more of it, which is why the two belong in the same plan and not in competition.
