The four calculators below are all designed to estimate your VO2 Max or the maximum rate of oxygen that your body can absorb and utilize to fuel maximal-effort physical activity. It is written in milliliters of oxygen per kilogram of body weight per minute (ml/kg/min).
The more oxygen your body can uptake and use, the better performance potential. But this depends on your level of fitness or how efficiently your heart and veins can deliver blood to muscles. Therefore, VO2max is essentially a measure of your cardiorespiratory fitness. The good news is you can increase your VO2 max through training and exercise.
It’s also important to note that three out of the four calculators on this page require you to take a self-administered physical exertion test and push yourself. Therefore, these tests may not be appropriate for everyone. If you suffer from any health conditions or do not regularly engage in similar physical activities, then it is best to avoid these tasks or check with a medical professional before doing them.
VO2 Max Calculator: Resting Heart Rate Based
This calculator estimates VO2 max based on how many times your heart beats in 20 seconds while your body is in a rested state. It’s simpler and easier to use compared to the other calculators you’ll find below. However, keep in mind, it may not be the most accurate.
How to take the resting heart rate test
While in a relaxed state, take your pulse by counting the number of times your heart beats in 20 seconds. Enter this number, your age and your sex into the calculator to estimate your VO2 max.
Example: Male, 40 years, 20 beats in 20 seconds at rest
46ml/kg/min: your estimated VO2 max
Your estimated VO2 max is 46 ml/kg/min, excellent for men aged 40 to 49.
Uth and colleagues tested this method on well-trained men aged 21 to 51; with the maximum heart rate predicted from age, its typical error was about 4.7 ml/kg/min. A field test estimates VO2 max; only a lab test that analyzes your breath measures it. Enter your own numbers above to replace this example.
Category
Excellent
Against men aged 40 to 49.
Resting heart rate
60 bpm
Your 20-second count times 3.
Predicted maximum
180 bpm
208 minus 0.7 times your age (Tanaka 2001).
This estimate comes from the ratio of your maximum heart rate to your resting heart rate (Uth and colleagues, 2004), so a lower resting rate gives a higher number. We predict your maximum heart rate from your age with the formula of Tanaka and colleagues (2001). Grades compare the whole-number estimate with the categories of Heyward and Gibson, from the Cooper Institute, for men by decade from 20 to 79.
Sources: Uth et al. 2004 (Eur J Appl Physiol); Tanaka et al. 2001 (J Am Coll Cardiol); VO2 max categories, Heyward and Gibson (PLoS One 2018, Tables 3 and 4)
You can learn how to manually take your pulse here.
VO2 Max Calculator: Three Minute Step Test
This calculator requires a 3-minute step test to estimate your VO2 max. You’ll need a step, box or bench 16.25 inches (41.3 cm) high, a stopwatch, and a metronome. The formula comes from the Queens College Step Test, which used a bench of that height. A lower step keeps your heart rate down and overstates your VO2 max. If you do not have a metronome, you can use the free online version at metronomeonline.com
You’ll also need to check your pulse which you can do manually or using a heart rate device.
How to do the three-minute step test
Note: This test is strenuous and we only recommend it for healthy and decently fit individuals.
First do a few practice rounds by stepping up with your left leg first then your right leg, and then step down with your left leg followed by your right leg. This is the sequence you’ll use for the test.
For men: Set the metronome to 96 beats per minute
For women: Set the metronome to 88 beats per minute
Make sure you can hear the metronome during the test.
- When you’re ready to begin, start the stopwatch and perform the test by taking one step for every beat of the metronome for 3 consecutive minutes. Do this at a consistent pace.
- Wait 5 seconds and then check your pulse by counting the number of times your heart beats in 15 seconds. Enter this number, your age and your sex into the calculator to estimate your VO2 max.
Example: Female, 25 years, 40 beats in 15 seconds after stepping
36ml/kg/min: your estimated VO2 max
Your estimated VO2 max is 36 ml/kg/min, fair for women aged 20 to 29.
The equation comes from the Queens College step test on a 16.25 in (41.3 cm) bench. A lower step keeps your heart rate down and overstates your VO2 max. Enter your own numbers above to replace this example.
Category
Fair
Against women aged 20 to 29.
Heart rate after the test
160 bpm
Your 15-second count times 4.
The Queens College step test equation for women estimates VO2 max from your heart rate after the test. The lower your heart rate, the higher the estimate. Grades compare the whole-number estimate with the categories of Heyward and Gibson, from the Cooper Institute, for women by decade from 20 to 79.
Sources: Queens College step test equations, as printed in Liangruenrom et al. 2025 (BMC Public Health); VO2 max categories, Heyward and Gibson (PLoS One 2018, Tables 3 and 4)
VO2 Max Calculator: 1.5 Mile Run / Walk Test
This calculator uses the Cooper 1.5 mile run/walk test to estimate VO2 max.
According to a study by the American College of Sports Medicine, the 1.5 run test is a valid method for assessing cardiovascular fitness (1).
How to run or walk the 1.5-mile test
Note: We do not recommend the 1.5 mile run for those who are not physically fit, not used to running, overweight, or who have any health conditions that require supervision from a medical professional. The 1.5 mile walk may be the better option if you’re physically capable.
Before you take the test, you should find a level surface like a running track or any suitable area and measure out a distance of 1.5 miles, or you can use a treadmill.
It’s also a good idea to warm up for roughly 5 minutes by walking at a decent pace.
- When you’re ready, start the stopwatch and begin running at your own pace or walk the 1.5 mile distance as fast as you can.
- Stop the timer and enter your time, age and sex into the calculator to get an estimate of your VO2 max.
Example: Male, 30 years, 1.5 miles in 11 min 30 s
46ml/kg/min: your estimated VO2 max
Your estimated VO2 max is 46 ml/kg/min, good for men aged 30 to 39.
The test asks for your best effort over 1.5 miles (2.4 km) on flat ground, running or walking. Enter your own numbers above to replace this example.
Category
Good
Against men aged 30 to 39.
Your time
11.50 min
Minutes and seconds as a decimal, as the formula takes them.
The 1.5-mile run equation from the American College of Sports Medicine (ACSM) uses only your finish time. Finish faster and your estimate goes up. Grades compare the whole-number estimate with the categories of Heyward and Gibson, from the Cooper Institute, for men by decade from 20 to 79.
Sources: 1.5-mile run equation from ACSM's Guidelines for Exercise Testing and Prescription, as printed in Chizewski et al. 2021 (Int J Environ Res Public Health); VO2 max categories, Heyward and Gibson (PLoS One 2018, Tables 3 and 4)
VO2 Max Calculator: One Mile Walk Test
This calculator estimates VO2 max using the Rockport Walking Test. It’s a better option for people who are not as fit or who are overweight.
According to one study, the Rockport 1 mile test is a “valid predictor of VO2 max” and viable alternative to the Air Force 1.5 mile run for assessing cardiovascular fitness (2).
This test involves walking one mile and then measuring your heart rate. You’ll also enter your weight, age, and the time it took you to complete the mile.
To do it you’ll need…
- A scale to weigh yourself
- Appropriate clothing and shoes for walking
- An area or treadmill to walk a one mile distance
- Stopwatch
- GPS
You’ll also need to measure your heart rate which can be done manually checking the wrist or neck pulse, or using a heart rate device such as a fitness tracker or other heart rate monitor.
There are advantages and disadvantages of doing physical exertion tests because the environment (e.g., performing the tests inside or outside) can affect the results.
How to walk the Rockport mile
Before you perform the test, make sure to find a level and consistent walking surface, or use a treadmill.
- Start by walking at a normal, easy pace for a few minutes to warm up and prepare for the one mile walk.
- Start the stopwatch and walk as fast as you can (without jogging) for one mile.
- After you’ve walked one mile, stop the timer and record the result.
- Immediately take your pulse by counting the number of times your heart beats in 10 seconds. Make sure to record this number to enter it in the calculator.
- Input the values into the calculator for an estimate of your VO2 max.
Example: Male, 45 years, 180 lb, a mile in 15 min 0 s, 20 beats in 10 seconds
40ml/kg/min: your estimated VO2 max
Your estimated VO2 max is 40 ml/kg/min, fair for men aged 40 to 49.
Kline and colleagues built the Rockport equation on 343 healthy adults aged 30 to 69 who walked a mile as fast as they could. Enter your own numbers above to replace this example.
Category
Fair
Against men aged 40 to 49.
Heart rate at the finish
120 bpm
Your 10-second count times 6.
Your time
15.00 min
Minutes and seconds as a decimal, as the formula takes them.
- Next stepFitness age calculatorA VO2 max estimate with no test at all, from waist, resting heart rate and exercise habits, turned into an age.
- Next stepTarget heart rate calculatorHeart rate zones to train the fitness this number measures.
The Rockport walk equation of Kline and colleagues (1987) works from your mile time and your heart rate at the finish, adjusted for your weight, age and sex. A faster mile at a lower heart rate gives a higher estimate. Grades compare the whole-number estimate with the categories of Heyward and Gibson, from the Cooper Institute, for men by decade from 20 to 79.
Sources: Kline et al. 1987 (Med Sci Sports Exerc); VO2 max categories, Heyward and Gibson (PLoS One 2018, Tables 3 and 4)
Reading Your VO2 Max Results
Each calculator will display your results and classifications based on your sex and age range expressed in milliliters of oxygen used per kilogram of body weight per minute (ml/kg/min). The result card already shows the band for your age and sex, and the formula it used, with its source. All four calculators grade the whole-number estimate on the tables below, which cover every age group from 20 to 79; outside that range they give the estimate without a grade.
The calculators will show your results or fitness level ranging from poor to superior in a simple and easy to read format.
VO2 max categories for men, by age (ml/kg/min)
| Age | Poor | Fair | Good | Excellent | Superior |
|---|---|---|---|---|---|
| 20 to 29 | ≤ 41 | 42 to 45 | 46 to 50 | 51 to 55 | 56+ |
| 30 to 39 | ≤ 40 | 41 to 43 | 44 to 47 | 48 to 53 | 54+ |
| 40 to 49 | ≤ 37 | 38 to 41 | 42 to 45 | 46 to 52 | 53+ |
| 50 to 59 | ≤ 34 | 35 to 37 | 38 to 42 | 43 to 49 | 50+ |
| 60 to 69 | ≤ 30 | 31 to 34 | 35 to 38 | 39 to 45 | 46+ |
| 70 to 79 | ≤ 27 | 28 to 30 | 31 to 35 | 36 to 41 | 42+ |
VO2 max categories for women, by age (ml/kg/min)
| Age | Poor | Fair | Good | Excellent | Superior |
|---|---|---|---|---|---|
| 20 to 29 | ≤ 35 | 36 to 39 | 40 to 43 | 44 to 49 | 50+ |
| 30 to 39 | ≤ 33 | 34 to 36 | 37 to 40 | 41 to 45 | 46+ |
| 40 to 49 | ≤ 31 | 32 to 34 | 35 to 38 | 39 to 44 | 45+ |
| 50 to 59 | ≤ 24 | 25 to 28 | 29 to 30 | 31 to 34 | 35+ |
| 60 to 69 | ≤ 25 | 26 to 28 | 29 to 31 | 32 to 35 | 36+ |
| 70 to 79 | ≤ 23 | 24 to 26 | 27 to 29 | 30 to 35 | 36+ |
Cooper Institute categories as published by Heyward and Gibson (PLoS One 2018, Tables 3 and 4). In the women’s table the 60 to 69 row sits about one point above the 50 to 59 row, the reverse of every other step. That is how Heyward and Gibson print it, so it is left as is.
VO2: Oxygen and ATP (Energy Currency of Cells)
During exercise, our bodies take in oxygen from the air where it’s then transferred from our blood to the muscles. This process, also known as cellular respiration, is the catalyst to convert the energy from foods we eat (e.g. glucose from carbohydrates) into the molecules adenosine triphosphate (ATP), also known as the energy currency of cells.
It’s also important to note that ATP can also be produced anaerobically or without oxygen, although, for very short durations.
ATP has three phosphate groups. When cells need energy to power physiological processes such as muscle contractions, ATP is broken down into adenosine diphosphate (ADP), which only contains two phosphate groups. A phosphate is then removed from ADP and forms adenosine monophosphate (AMP). Energy can then be released into cells and cause favorable reactions, or do their work in the cells.
But when there’s extra energy in the cells from foods we eat, ADP is turned back into ATP and this continues over and over again. That’s why ATP are often compared to rechargeable batteries. ATP are the higher energy source while ADP are the lower energy source, and glucose plus the addition of the third phosphate group recharges ADP into ATP.
Find Your VO2 Max
You can use our VO2 max calculators to help you determine one aspect of your physical fitness. The more oxygen your body is able to use during exercise, the better performance potential. The good news is, you can become fitter and increase your VO2 max and consequently see more results and achieve your goals.
It’s not necessarily an indicator of what you can achieve in your chosen discipline as there are many factors that determine this. However, improving your cardiorespiratory fitness is a good start.
