VO2 Max Calculator: Cooper, Rockport and Heart Rate

VO2 Max Calculator

Estimate relative VO2 max with the Cooper 12-minute run, Rockport one-mile walk, or measured heart-rate ratio. You can also convert between relative and absolute oxygen uptake.

Used for Rockport and for absolute oxygen uptake.
The original Rockport validation sample covered ages 30–69.
Enter minutes or MM:SS.
Use a genuinely measured maximum, not an age-predicted value.
Enter absolute oxygen uptake in L/min.
Relative VO2 max—
Absolute oxygen uptake—
MET equivalent—
Method—

How the VO2 max estimates work

VO2 max is commonly reported as milliliters of oxygen per kilogram of body mass per minute (mL/kg/min). This calculator keeps three field-test estimates separate because they use different measurements and populations. It does not average incompatible tests.

Example: 2,400 meters in the Cooper 12-minute run gives (2,400 − 504.9) ÷ 44.73 = 42.37 mL/kg/min. At 70 kg, that is about 2.97 L/min and 12.10 METs.

Formulas and sources

  • Cooper 12-minute run: VO2 max = (distance in meters − 504.9) ÷ 44.73.
  • Rockport one-mile walk: 132.853 − 0.0769 × weight(lb) − 0.3877 × age + 6.315 × sex coefficient − 3.2649 × time(min) − 0.1565 × finishing heart rate.
  • Heart-rate ratio: VO2 max = 15.3 × measured maximum heart rate ÷ measured resting heart rate.
  • Absolute conversion: L/min = mL/kg/min × body weight(kg) ÷ 1,000.
  • MET equivalent: METs = mL/kg/min ÷ 3.5.

Primary references: Cooper (1968) for the 12-minute field test, Kline et al. (1987) for the one-mile walk test, and Uth et al. (2004) for the heart-rate-ratio estimate.

Limits and safe use

This calculator estimates cardiorespiratory fitness; it does not measure VO2 max or diagnose health. Direct measurement requires a graded exercise test with respiratory gas analysis. Field results vary with pacing, terrain, weather, altitude, equipment, medication, fatigue and measurement error.

Maximal running can be strenuous. Do not perform a maximal test without appropriate clearance if you have cardiovascular or respiratory disease, are pregnant, take medication that affects heart rate, have been told to limit exercise, or have chest pain, faintness, unusual shortness of breath or palpitations. Stop exercising and seek appropriate medical care for concerning symptoms.

The calculator intentionally does not label a result “poor,” “good,” or “excellent,” because reference categories vary by age, sex, population and protocol.

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