What Is a Good VO2 Max and How Do You Calculate It?

Your Apple Watch says your cardio fitness is 38. Your friend's Garmin says 52. You are both 35 years old and you both run 3 times a week. Is 38 bad? Is 52 exceptional? What number should you be aiming for, and what does the number even measure?

VO2 max is the single best laboratory measure of cardiorespiratory fitness. It tells you the maximum rate at which your body can take in, transport, and use oxygen during intense exercise. Higher is better, and the research is clear: every 3.5 mL/kg/min improvement (one MET) reduces your all-cause mortality risk by 14%. This guide covers what the numbers mean, how to calculate yours, and what target to aim for based on your age and sex.

What VO2 Max Is and Why It Matters

VO2 max stands for maximal oxygen uptake. It is measured in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min). One MET, the unit you see on treadmills and fitness apps, equals about 3.5 mL/kg/min.

The physiological basis is the Fick equation:

VO2 = Cardiac output x (Arterial O2 content minus Venous O2 content)

At maximum effort, this becomes your VO2 max. Your cardiac output (heart rate x stroke volume) and your muscles' ability to extract oxygen from blood both have genetic limits. Training can improve VO2 max by 15% to 25% in untrained individuals, but the genetic ceiling is real.

Why does it matter? A 2024 meta-analysis in the Journal of Sport and Health Science (Singh et al.) pooled 42 studies with 3.8 million observations. For every 1-MET increase in cardiorespiratory fitness:

• All-cause mortality risk dropped 14%
• Cardiovascular mortality risk dropped 16%

The benefit was linear across the range most people can reach. You do not need to be an elite athlete to see meaningful health gains.

Use our VO2 Max Calculator to estimate yours from a run or walk test.

Normative VO2 Max Values by Age and Sex

The standard reference tables come from the Cooper Institute and ACSM's Guidelines for Exercise Testing and Prescription (11th edition). Here are the median (50th percentile) and "good" ranges:

Men

Age	Median	Good range	Excellent
20 to 29	48.0	46 to 52	53 to 59
30 to 39	42.4	44 to 50	51 to 56
40 to 49	37.8	42 to 48	49 to 54
50 to 59	32.6	39 to 45	46 to 51
60 to 69	28.2	30 to 36	37 to 42

Women

Age	Median	Good range	Excellent
20 to 29	37.6	37 to 41	42 to 47
30 to 39	30.2	36 to 40	41 to 45
40 to 49	26.7	34 to 38	39 to 43
50 to 59	23.4	32 to 36	37 to 41
60 to 69	20.0	25 to 30	31 to 35

A "good" VO2 max is around the 75th percentile for your age and sex. For men, that is roughly 55 (20s), 49 (30s), 45 (40s), and 40 (50s). For women, about 45 (20s), 36 (30s), 32 (40s), and 28 (50s).

How to Calculate VO2 Max

The Cooper 12-Minute Run Test

Dr. Kenneth Cooper published this test in JAMA in 1968. You run as far as possible in 12 minutes and measure the distance.

VO2 max = (Distance in meters minus 504.9) / 44.73

Example: You run 2,400 meters in 12 minutes. VO2 max = (2,400 minus 504.9) / 44.73 = 42.4 mL/kg/min

The 1.5-Mile Run Test

Run 1.5 miles as fast as possible and record your time in minutes.

VO2 max = (483 / time in minutes) + 3.5

Example: You run 1.5 miles in 12 minutes. VO2 max = (483 / 12) + 3.5 = 43.75 mL/kg/min

The Uth Formula (Non-Exercise Estimate)

If you know your maximum heart rate and resting heart rate:

VO2 max = 15.3 x (HRmax / HRrest)

Example: Your max HR is 190 and your resting HR is 60. VO2 max = 15.3 x (190 / 60) = 48.5 mL/kg/min

This is a rough estimate. It is convenient but less accurate than an actual run test.

How Accurate Are Apple Watch and Garmin?

Apple Watch

Apple Watch estimates VO2 max (labeled "Cardio Fitness") from outdoor walk, run, and hike data using heart rate, GPS pace, and user demographics. A 2026 validation study in Mayo Clinic Proceedings: Digital Health found:

• Apple Watch underestimated VO2 max by an average of 6.25 mL/kg/min
• Mean absolute error: 6.79
• Only 14% of participants were correctly classified into the right fitness percentile

Apple Watch is useful for tracking trends over time, but the absolute number may be off by 5 to 7 points. If your Apple Watch says 38, your actual VO2 max could be anywhere from 34 to 45.

Garmin

Garmin uses Firstbeat Analytics, which estimates VO2 max from the pace-to-heart-rate relationship during running or the power-to-heart-rate relationship during cycling. A 2025 validation study in the European Journal of Applied Physiology found:

• Mean absolute percentage error: 7 to 8% in trained athletes
• Garmin underestimates highly trained athletes by about 6.3 mL/kg/min
• Under ideal conditions (chest strap HR), Garmin reports about 5% error

Garmin is generally more accurate than Apple Watch for recreational athletes but still tends to underestimate elite performers.

The takeaway: treat wrist-based VO2 max as a trend tracker, not a precise measurement. If you want an accurate number, do a Cooper 12-minute test on a track.

Example 1: The Recreational Runner

Brian is 38, male, and weighs 175 pounds. He runs 3 times per week at a moderate pace. He does a Cooper 12-minute test on a standard 400-meter track and covers 9.5 laps (3,800 meters).

VO2 max = (3,800 minus 504.9) / 44.73 = 73.7

Wait, that seems too high. Let us recheck. Brian actually covers 2,400 meters in 12 minutes.

VO2 max = (2,400 minus 504.9) / 44.73 = 42.4

For a 38-year-old male, the median is 42.4. Brian is exactly average. The "good" range for his age is 44 to 50. To reach "good," he needs to cover about 2,475 meters in 12 minutes, which requires improving his pace from 8:00 per mile to about 7:45 per mile.

Example 2: The Sedentary Office Worker

Jennifer is 45, female, and does not exercise. Her Apple Watch reports a cardio fitness of 24. Given the known underestimation, her actual VO2 max is probably around 28 to 30.

For a 45-year-old female, the median is 26.7 and the "good" range starts at 34. Jennifer is at or slightly below the median. Her mortality risk is higher than someone in the "good" range.

If she starts a walking and jogging program and improves her VO2 max by 3.5 points (one MET) to about 32, her all-cause mortality risk drops by 14%. If she improves by 7 points (two METs) to about 35, her risk drops by roughly 26%. These are meaningful, achievable gains from moderate exercise.

Use our Heart Rate Zones Calculator and Pace Calculator to train at the right intensity for improving VO2 max.

Elite Athlete VO2 Max Values

Top professional cyclists routinely test in the 70 to 90 mL/kg/min range. Some notable values:

Athlete	VO2 max (mL/kg/min)
Oskar Svendsen	97.5
Jonas Vingegaard	~97 (at age 17)
Greg LeMond	92.5
Miguel Indurain	88
Tadej Pogacar	~93 (estimated)
Chris Froome	84.6

Elite female endurance athletes typically reach 60 to 80 mL/kg/min. These numbers are largely genetic. Training can improve VO2 max by 15% to 25%, but no amount of training will take someone from 40 to 90.

Common Mistakes to Avoid

1. Trusting wrist-based estimates as exact numbers. Apple Watch and Garmin can be off by 5 to 7 points. Use them to track trends, not to compare against normative tables. For an accurate number, do a field test.

2. Comparing your number to the wrong age group. VO2 max declines about 10% per decade after age 30. A 42 is excellent for a 60-year-old but average for a 30-year-old. Always compare against your age and sex percentile.

3. Ignoring the health benefit of small improvements. You do not need to reach "superior" to see health gains. Each 3.5 point improvement (one MET) reduces mortality risk by 14%. Going from 30 to 35 is more impactful than going from 50 to 55.

4. Doing the test in poor conditions. The Cooper test assumes you are giving a maximal effort on a flat surface in good weather. A treadmill test, wind, or uneven terrain will skew the result. Use a standard 400-meter track.

External Research and Resources

• ACSM's Guidelines for Exercise Testing and Prescription, 11th Edition is the standard reference for VO2 max normative tables and fitness testing protocols.
• Singh et al., Journal of Sport and Health Science 2024 is the largest meta-analysis on cardiorespiratory fitness and mortality, pooling 3.8 million observations across 42 studies.
• Cooper KH, JAMA 1968 is the original paper describing the 12-minute run test for estimating VO2 max.

People Also Ask

What is a good VO2 max for my age?

A good VO2 max is around the 75th percentile for your age and sex. For men, that is roughly 55 (20s), 49 (30s), 45 (40s), and 40 (50s) mL/kg/min. For women, about 45 (20s), 36 (30s), 32 (40s), and 28 (50s).

How is VO2 max calculated?

VO2 max can be calculated from a Cooper 12-minute run test using the formula: (distance in meters minus 504.9) / 44.73. It can also be estimated from a 1.5-mile run time: (483 / time in minutes) + 3.5. Wrist-based devices like Apple Watch and Garmin estimate it from heart rate and pace data.

How accurate is Apple Watch VO2 max?

A 2026 validation study found Apple Watch underestimates VO2 max by an average of 6.25 mL/kg/min, with only 14% of users correctly classified into the right fitness percentile. It is useful for tracking trends but not reliable for absolute values.

Does VO2 max predict lifespan?

Yes. A 2024 meta-analysis of 3.8 million observations found that every 1-MET increase in cardiorespiratory fitness (about 3.5 mL/kg/min) reduces all-cause mortality risk by 14% and cardiovascular mortality risk by 16%. The benefit is linear across the range most people can reach.

Can you improve VO2 max?

Yes. Training can improve VO2 max by 15% to 25% in untrained individuals, primarily through high-intensity interval training. The genetic ceiling limits how high you can go, but most sedentary people are far below their genetic potential. Even small improvements of 3.5 points (one MET) produce measurable health benefits.

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