Health & fitness
Estimate VO2 max from a one-mile walk field test.
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VO2 max calculator guide
VO2 max is the highest rate at which your body can take up and use oxygen during exercise, expressed in millilitres per kilogram of body weight per minute, and it is a strong marker of aerobic fitness. Measuring it properly requires a treadmill or bike test to exhaustion with gas analysis, so this calculator uses the Rockport one-mile walk test, a field protocol published in 1987 by Kline and colleagues. You walk one mile as fast as you can, record the time in minutes and your heart rate immediately at the finish, and enter those with your age, sex, and weight in kilograms. The equation was built on adults aged 30 to 69 and estimates laboratory VO2 max with a standard error of about 5 mL/kg/min, enough to place you in a fitness band and track change. The result is a fitness screening estimate, not a clinical measurement or a diagnosis; anyone with heart or breathing symptoms should stop the test and seek medical advice.
Rockport VO2 max (mL/kg/min) = 132.853 − 0.0769 × weight (lb) − 0.3877 × age (years) + 6.315 × sex − 3.2649 × walk time (minutes) − 0.1565 × post-walk heart rate (bpm), where sex = 1 for male and 0 for female. Weight in kg is converted with × 2.20462 first.
Worked example with the default inputs: a 35-year-old male weighing 70 kg who walks one mile in 15.0 minutes and finishes with a heart rate of 120 bpm. Weight in pounds = 70 × 2.20462 = 154.32 lb. Terms: 0.0769 × 154.32 = 11.87; 0.3877 × 35 = 13.57; sex = +6.315; 3.2649 × 15 = 48.97; 0.1565 × 120 = 18.78. VO2 max = 132.853 − 11.87 − 13.57 + 6.315 − 48.97 − 18.78 = 45.98, displayed as 46 mL/kg/min. The same walk by a 35-year-old female of the same weight would score 45.98 − 6.315 = 39.7 mL/kg/min. Both sit in the good-to-excellent range for their age.
Enter weight in kilograms; the calculator multiplies by 2.20462 to get the pounds the original equation used. Walk time is decimal minutes, so 14 minutes 30 seconds is 14.5. The distance must be exactly one mile, or 1,609 metres, which is four laps of a standard 400 m track plus 9 m. Heart rate is beats per minute taken within 5–10 seconds of finishing, before it starts to recover. The output is mL/kg/min, comparable with laboratory results.
This is a screening figure, not a diagnosis. Population formulas do not account for build, muscle mass, age, pregnancy, ethnicity, or medical history, so an individual result can sit well outside the healthy band without indicating a problem, or inside it while one exists. Discuss anything that concerns you with a qualified clinician rather than acting on this number alone. On this page the figure rests entirely on age, sex, weight, one-mile walk time and post-walk heart rate, so start there if the vo2 max calculator returns something you did not expect.
Good to know: waiting a minute before taking the finish pulse lowers the heart rate and inflates the estimate, so read it immediately. A hilly or windy course, a treadmill, or a track lap count that is not exactly one mile all shift the result. The test assumes a brisk but steady walk; jogging any part of it invalidates the equation. Entering weight in pounds when the field expects kilograms adds roughly 8 mL/kg/min of error for a 70 kg person.
This is an educational screening estimate, not a diagnosis or a substitute for professional medical advice.
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How it works
Estimate VO2 max from a one-mile walk field test. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Age = 35 · Sex = male · Weight = 70 kg · One-mile walk time = 15 minutes · Post-walk heart rate = 120 bpm → 46 mL/kg/min (one-mile walk field-test estimate). Change an input above and this example updates with your numbers.
Common questions
Walk one mile as fast as you can, note the time in minutes and your heart rate at the finish, and apply the Rockport equation: 132.853 − 0.0769 × weight (lb) − 0.3877 × age + 6.315 (men only) − 3.2649 × time − 0.1565 × heart rate. A 35-year-old, 70 kg man walking 15 minutes at 120 bpm scores 46 mL/kg/min.
Published fitness norms place men aged 30–39 at roughly 35–45 mL/kg/min for average to good and above 48 as excellent; women in the same age band average about 30–38, with above 42 excellent. Values decline around 1% per year after 30. A score of 46 for a 35-year-old man is good to excellent.
Kline and colleagues reported a correlation of 0.88 with treadmill VO2 max and a standard error of about 5 mL/kg/min in adults aged 30 to 69. That is adequate for placing yourself in a fitness band and tracking change, but not for the precision of a laboratory test, and it is less reliable for very fit people who cannot raise their heart rate enough by walking.
Yes, in two ways. The equation subtracts 0.0769 per pound because heavier walkers have lower relative oxygen uptake per kilogram. Because the unit is per kilogram of body weight, losing fat mass while keeping fitness raises VO2 max even if absolute oxygen use is unchanged.
The equation was validated on a flat outdoor or indoor track, and treadmill walking at 0% incline usually gives a slightly lower heart rate, so the estimate may read high. If you use a treadmill, keep the incline at 1% and use the same setup each time so your trend is consistent. Stop if you feel unwell; this is a screening estimate, not a medical test.