The average VO2 max for women in their 20s is about 31 ml/kg/min, dropping to around 22 ml/kg/min by the 30s, 19 ml/kg/min in the 40s, 17 ml/kg/min in the 50s, and 16 ml/kg/min by the 60s. These 50th-percentile values represent the midpoint for each age group, meaning half of women score higher and half score lower. Where you fall on this scale depends on your age, activity level, and genetics.
VO2 max measures the maximum amount of oxygen your body can use during intense exercise, expressed in milliliters per kilogram of body weight per minute. It’s considered the gold standard marker of cardiovascular fitness, and it declines naturally with age in both men and women.
Average VO2 Max for Women by Age
The table below shows VO2 max values at the 50th percentile (average), along with thresholds for “good” (75th percentile) and “excellent” (90th percentile) fitness levels.
- Ages 20 to 29: Average is 31.2. Good starts at 37.1. Excellent is 42.6 or above.
- Ages 30 to 39: Average is 21.7. Good starts at 25.1. Excellent is 30.0 or above.
- Ages 40 to 49: Average is 19.3. Good starts at 22.6. Excellent is 26.2 or above.
- Ages 50 to 59: Average is 17.2. Good starts at 20.1. Excellent is 22.6 or above.
- Ages 60 to 69: Average is 16.1. Good starts at 18.3. Excellent is 20.5 or above.
On the lower end, scoring below the 25th percentile is generally classified as “poor.” For a woman in her 20s, that means anything below about 23 ml/kg/min. For a woman in her 50s, the poor threshold sits around 15.3. These aren’t health emergencies on their own, but they do signal that your cardiovascular system has significant room for improvement.
Why VO2 Max Drops With Age
The decline is steep. A woman in her 20s with an average score of 31.2 can expect that number to roughly halve by her 60s if she follows the population trend. Several things drive this. Your heart’s maximum rate decreases by roughly one beat per year. Muscle mass declines, which reduces your body’s ability to extract and use oxygen. And most people simply become less active over time, which accelerates both of those losses.
The encouraging part: a 50-year-old woman who scores 22.6 or higher has fitness on par with the average 30-year-old. Consistent aerobic training can offset a large portion of the age-related decline, effectively keeping your cardiovascular system 10 to 20 years “younger” than your chronological age.
How Female Athletes Compare
Elite female endurance athletes operate in a completely different range. Female distance runners routinely test between 50 and 85 ml/kg/min. Female cyclists fall in the 47 to 74 range. Cross-country skiers, who use both upper and lower body muscles simultaneously, reach the highest recorded values at 60 to 94 ml/kg/min. Female swimmers typically land between 40 and 70.
At the Olympic level, the numbers climb even further. Champion female distance runners commonly exceed 75 ml/kg/min, and top cyclists test above 90. These values are two to three times higher than the average for women of the same age, which underscores how dramatically trainable VO2 max is. The gap between men and women also narrows at elite levels, shrinking to roughly 10%, compared to a wider gap in the general population where training habits vary more.
What Affects Your Score Beyond Fitness
Hormonal fluctuations during the menstrual cycle can shift VO2 max readings. Research published in Frontiers in Endocrinology found that aerobic performance during the follicular phase (the first half of your cycle, before ovulation) tends to be higher than during the luteal phase (the second half). The difference isn’t huge, but if you’re testing your VO2 max and want consistency, repeating the test during the same cycle phase gives you a more reliable comparison over time. Interestingly, the same research noted that consuming glucose before testing can reduce the impact of hormonal fluctuations on performance.
Body composition also plays a role that’s easy to overlook. Because VO2 max is expressed per kilogram of body weight, two women with identical cardiovascular systems will get different scores if one weighs more. This doesn’t mean the heavier person is less fit in absolute terms, but the relative score (the one used in all the charts above) will be lower. This is one reason VO2 max values for women tend to be lower than for men on average: women carry a higher percentage of essential body fat, which adds to the denominator without contributing to oxygen consumption.
How to Estimate Your VO2 Max
True VO2 max testing happens in a lab, where you wear a mask that measures your oxygen and carbon dioxide while running on a treadmill or pedaling a bike at increasing intensity until you can’t continue. It’s accurate but expensive and uncomfortable.
Most people rely on estimates instead. Many fitness watches calculate VO2 max using your heart rate during runs or walks, and while they’re not perfect, they track trends reasonably well over time. The Rockport Walk Test is a popular field test: you walk one mile as fast as you can, record your time and heart rate at the finish, then plug those numbers into a formula that accounts for age, weight, and sex. It’s free and requires nothing more than a flat surface and a stopwatch.
Gym-based submaximal tests, like those on stair-stepping machines, are convenient but less reliable. One study testing young women found that a popular stair-stepper protocol significantly underpredicted VO2 max in women who weren’t regular stair-climbers, missing by an average of nearly 7 ml/kg/min. That’s a massive error, enough to shift you from “good” to “poor” on the charts. If you do use a submaximal test, treat it as a rough starting point rather than a definitive number, and retest periodically under the same conditions to track your progress.
How to Improve Your VO2 Max
VO2 max responds well to training at any age. High-intensity interval training is the most time-efficient approach. Alternating between hard efforts (85 to 95% of your max heart rate) and recovery periods for 20 to 30 minutes, two to three times per week, produces measurable gains within six to eight weeks for most women. A typical beginner might see improvements of 15 to 20% in the first few months of consistent training.
Steady-state endurance work matters too. Longer sessions at a moderate pace (where you can hold a conversation but it’s not easy) build the base of mitochondria and capillaries in your muscles that support oxygen use. Combining both interval and steady-state training in a weekly routine produces the best results. Even women in their 60s and 70s can improve VO2 max meaningfully. The rate of improvement slows with age, but the health benefits of moving up even a few points on the scale are substantial, since each 1 ml/kg/min increase in VO2 max is associated with a meaningful reduction in cardiovascular disease risk and all-cause mortality.