Garmin VO2 max by age and sex: what does my number mean?
Garmin estimates VO2 max from your pace and heart rate, then compares it with a table from The Cooper Institute. Put in your number to see the level, the gap to the next one, and what the estimate can and cannot tell you.
Still needed:
- Age
- Sex
- VO2 max
Enter your numbers to see the level. Nothing is uploaded or stored.
How accurate is the Garmin number?
It is an estimate, not a lab test. Garmin derives it from pace, heart rate and your profile: age, weight and maximum heart rate. A chest strap, a measured maximum and GPS pace all make it closer; wrist heart rate in the cold or a loose strap makes it worse.
A change smaller than one point is noise. One hot run or one bad night of sleep does not make a trend.
Why it goes down
- Heat and humidity: the same pace costs a higher heart rate, so the estimate drops.
- Illness, alcohol and poor sleep: several days of lower readings.
- Two to four weeks without training: the estimate follows detraining.
- Altitude, weight gain, or a maximum heart rate setting you changed.
- GPS or heart-rate errors on the run that produced the estimate.
What raises it
- Easy volume: three to five hours a week, most of it conversational.
- Intervals: four bouts of four minutes near 90 to 95% of maximum heart rate, once or twice a week.
- Threshold work: 20 to 40 minutes of comfortably hard running.
- Time: six to twelve weeks of consistency before the number moves.
VO2 max responds to training, but how much depends on training history and genetics. Staying on a plateau for months is normal.
The table behind the result
Garmin owner's manual, VO2 Max. Standard Ratings. Data from The Cooper Institute. Table version garmin-manual-2026-10, checked 2026-10-18.
| Sex | Age | Superior | Excellent | Good | Fair | Poor |
|---|---|---|---|---|---|---|
| Men | 20–29 | 55.4 | 51.1 | 45.4 | 41.7 | < 41.7 |
| Men | 30–39 | 54 | 48.3 | 44 | 40.5 | < 40.5 |
| Men | 40–49 | 52.5 | 46.4 | 42.4 | 38.5 | < 38.5 |
| Men | 50–59 | 48.9 | 43.4 | 39.2 | 35.6 | < 35.6 |
| Men | 60–69 | 45.7 | 39.5 | 35.5 | 32.3 | < 32.3 |
| Men | 70–79 | 42.1 | 36.7 | 32.3 | 29.4 | < 29.4 |
| Women | 20–29 | 49.6 | 43.9 | 39.5 | 36.1 | < 36.1 |
| Women | 30–39 | 47.4 | 42.4 | 37.8 | 34.4 | < 34.4 |
| Women | 40–49 | 45.3 | 39.7 | 36.3 | 33 | < 33 |
| Women | 50–59 | 41.1 | 36.7 | 33 | 30.1 | < 30.1 |
| Women | 60–69 | 37.8 | 33 | 30 | 27.5 | < 27.5 |
| Women | 70–79 | 36.7 | 30.9 | 28.1 | 25.9 | < 25.9 |
Questions that come up
Is 49 a good VO2 max?
It depends on age and sex. 49 is Good for a man aged 20 to 29, Excellent for a man aged 30 to 39, and Superior for a woman aged 50 to 59. The level is always relative to your group.
Why did my VO2 max drop after one hot run?
Heat raises heart rate at the same pace, and Garmin reads that as a lower VO2 max. The number usually returns after a few cooler runs. Do not change your training because of one reading.
Does the watch match a lab test?
It comes close for many people, but a watch estimate is not a lab measurement. Compare your own values over time instead of comparing one watch number with one lab number.
Should I worry about a low number?
A low level is a training starting point, not a diagnosis. If the number falls sharply and stays down, or you have chest pain, breathlessness or unusual fatigue, talk to a doctor.
This page is not medical advice or a diagnosis. It explains a fitness estimate from your watch.