A good VO2 max for women generally falls between 30 and 40 mL/kg/min for most age groups, though what counts as “good” shifts significantly with age. Women in their 20s with a VO2 max of 36 to 44 are in solid shape, while a 60-year-old woman at 28 to 32 is performing well for her age. These numbers represent how efficiently your body delivers and uses oxygen during intense exercise, and they’re one of the strongest predictors of long-term health and cardiovascular fitness.
VO2 Max Ranges by Age for Women
VO2 max is measured in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min). The higher the number, the more oxygen your body can use during hard effort. Here’s how the ranges generally break down for women:
- Ages 20–29: Below 24 is considered poor. 30–36 is fair to average. 37–44 is good to excellent. Above 50 is elite.
- Ages 30–39: Below 22 is poor. 28–34 is fair to average. 35–42 is good to excellent. Above 48 is elite.
- Ages 40–49: Below 20 is poor. 26–32 is fair to average. 33–40 is good to excellent. Above 44 is elite.
- Ages 50–59: Below 18 is poor. 24–30 is fair to average. 31–37 is good to excellent. Above 40 is elite.
- Ages 60+: Below 16 is poor. 22–28 is fair to average. 29–34 is good to excellent. Above 37 is elite.
These ranges come from population-level fitness testing data and represent percentile distributions. If you land in the “good” range for your age, you’re fitter than roughly 60 to 75% of women your age. If you’re in the “excellent” zone, you’re outperforming the vast majority.
Why Women’s Numbers Are Lower Than Men’s
Women typically have VO2 max values 15 to 30% lower than men of the same age and training level. This isn’t about effort or fitness habits. It’s driven by real physiological differences that affect how much oxygen the body can transport and use.
Women have smaller hearts and lower blood volume than men, even after adjusting for body size. That means the heart pumps less blood per beat, so it has to beat faster to keep muscles supplied during exercise. Women also carry lower hemoglobin concentrations. Hemoglobin is the protein in red blood cells that carries oxygen, so less of it means less oxygen delivery per unit of blood. On top of that, women generally have a lower proportion of muscle mass relative to body weight, which means the muscles doing the work may need to recruit more fibers at lower intensities to compensate. All of these factors stack together to produce lower absolute VO2 max numbers.
This is exactly why comparing your VO2 max to male benchmarks is misleading. A woman with a VO2 max of 38 at age 35 is performing at a high level, even though that same number would be average for a man her age.
What Your VO2 Max Actually Tells You
VO2 max is more than a fitness score. It’s one of the most reliable predictors of all-cause mortality, meaning your risk of dying from any cause. People with higher cardiorespiratory fitness live longer and have lower rates of heart disease, diabetes, and certain cancers. For women specifically, moving from a “poor” to “fair” category provides the single largest reduction in health risk. You don’t need to be elite to see major benefits.
In practical terms, a higher VO2 max means your body is more efficient at delivering oxygen to working muscles. You’ll feel less winded climbing stairs, recover faster between intervals, and sustain harder efforts for longer. It also reflects the health of your heart, lungs, blood vessels, and mitochondria all working together.
How Accurate Is Your Watch’s Estimate?
If you’re checking your VO2 max on an Apple Watch, Garmin, or similar device, those numbers are estimates based on your heart rate and pace data, not direct measurements. A systematic review of wearable accuracy found that most devices land within about 5 to 10% of lab-tested values when used in outdoor or field settings. One study found a device underestimated VO2 max by an average of 4.5 mL/kg/min, which is a meaningful gap.
Most of the research on wearable accuracy has been done with roughly twice as many male participants as female, so the margin of error for women specifically isn’t well established. Your watch gives you a useful ballpark and is great for tracking trends over time, but if the number seems off by a few points in either direction, that’s within the expected range of error. A lab-based test using a mask and treadmill or bike remains the gold standard if you want precision.
How to Improve Your VO2 Max
VO2 max is highly trainable. Most women can improve theirs by 10 to 20% with consistent aerobic training over several months, with the biggest gains coming in the first 8 to 12 weeks. The two most effective approaches are high-intensity interval training (HIIT) and sustained moderate-intensity cardio, and combining both works best.
For intervals, a well-studied format involves repeating 60-second bursts at close to your maximum effort, separated by about 75 seconds of easy movement. Doing this 3 times per week produces measurable VO2 max improvements within just a few weeks. You can do these on a bike, treadmill, rowing machine, or even running outside. The key is hitting an intensity where you’re breathing very hard and couldn’t hold a conversation.
Longer, moderate-intensity sessions of 30 to 60 minutes (running, cycling, swimming at a pace where you can talk in short phrases) build the aerobic base that supports those high-intensity efforts. These sessions strengthen your heart’s ability to pump blood and improve capillary density in your muscles, giving oxygen more pathways to reach working tissue.
Consistency matters more than any single workout structure. Three to five cardio sessions per week, with at least one or two at higher intensity, is enough to drive meaningful improvement for most women. If you’re starting from a low baseline, even brisk walking can raise your VO2 max in the early weeks. As your fitness improves, you’ll need to progressively increase either the intensity or duration of your workouts to keep seeing gains.
Age-Related Decline and What You Can Do
VO2 max declines by roughly 1% per year after age 25 in sedentary individuals. In women who stay active, the decline slows to about 0.5% per year. This means a 50-year-old woman who has maintained a regular exercise habit can have a VO2 max comparable to a sedentary 30-year-old.
Menopause accelerates the decline somewhat, partly due to hormonal shifts that affect body composition, blood vessel elasticity, and how the body distributes fat. But training still works. Women in their 50s, 60s, and beyond respond to interval training and endurance exercise with real, measurable VO2 max improvements. Starting or maintaining a fitness habit at any age shifts the trajectory in your favor.