VO2 Max Calculator
VO2 max is the single best measure of aerobic fitness: it tells you how much oxygen your cardiovascular system can deliver to working muscles at peak effort. Laboratory measurement requires expensive equipment and an exhausting maximum-effort test. The Rockport 1-mile walk test, developed by researchers at the University of Massachusetts and published by Kline et al. in 1987, offers a validated alternative that can be completed by almost anyone. You walk exactly one mile as fast as possible without breaking into a run, then immediately record your heart rate. The formula uses your weight, age, sex, finish time, and heart rate to produce a VO2 max estimate accurate to within about 5 ml/kg/min of the true laboratory value. It works best for adults aged 30 to 69 who are not elite athletes. Use a measured 400-metre track (4 laps = 1 mile) or a flat measured road course. Wear a heart rate monitor or count your pulse manually at the finish line for 15 seconds and multiply by 4.
Formula
VO2max = 132.853 - (0.0769 * weight_lbs) - (0.3877 * age) + (6.315 * sex) - (3.2649 * time_min) - (0.1565 * HR)
sex: Male = 1, Female = 0
weight in pounds (kg * 2.20462)
time in decimal minutes (e.g. 15 min 30 sec = 15.5)
HR = heart rate in bpm at finish of walk
VO2 Max Calculator: frequently asked questions
What is VO2 max?
VO2 max (maximal oxygen uptake) is the maximum rate at which your body can consume oxygen during sustained exercise. It is the gold standard measure of cardiovascular fitness and is expressed in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). Higher VO2 max values indicate greater aerobic capacity.
How do I perform the Rockport 1-mile walk test?
Walk 1 mile (1.609 km) as fast as you can without running on a flat surface. Record the time taken in minutes (e.g., 15 minutes 30 seconds = 15.5 minutes). Immediately at the finish, measure your heart rate for 15 seconds and multiply by 4 to get your beats per minute. Enter both values along with your weight, age, and sex.
How accurate is this VO2 max estimate?
The Rockport Walking Test has a standard error of estimate of approximately 5 ml/kg/min compared with laboratory VO2 max testing. It was validated by Kline et al. (1987) in a population of adults aged 30 to 69. The formula is less accurate for highly trained athletes, very young adults, or people with unusual walking mechanics.
What is a good VO2 max for my age?
VO2 max norms vary by age and sex. For men aged 30-39, average is around 41-44 ml/kg/min; for women the same age, around 34-37 ml/kg/min. Elite male endurance athletes often exceed 70 ml/kg/min. VO2 max declines approximately 1% per year after age 25 without training, but regular aerobic exercise slows this decline significantly.
Can I improve my VO2 max?
Yes. Consistent aerobic training, particularly high-intensity interval training (HIIT) and long slow distance (LSD) running or cycling, has been shown to improve VO2 max by 5 to 30% depending on initial fitness level, training volume, and genetics. Improvements are fastest in sedentary individuals who begin a regular exercise programme.
Official sources
- Kline GM, et al. (1987). "Estimation of VO2max from a one-mile track walk, gender, age, and body weight." Medicine and Science in Sports and Exercise, 19(3):253-259.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.