VO2 Max Calculator — Resting HR, Walk & Run Tests

How this calculator works

• Resting heart rate (Uth et al., 2004): VO2 max = 15.3 × max HR ÷ resting HR. Max HR is age-predicted with Tanaka's 208 − 0.7 × age unless you enter a measured value.
• Rockport 1-mile walk (Kline et al., 1987): VO2 max = 132.853 − 0.0769 × weight (lb) − 0.3877 × age + 6.315 × sex (1 = male, 0 = female) − 3.2649 × time (min) − 0.1565 × heart rate at finish.
• Cooper 12-minute run (Cooper, 1968): VO2 max = (distance in metres − 504.9) ÷ 44.73.
• 1.5-mile run (ACSM): VO2 max = 3.5 + 483 ÷ time (min).

Aerobic capacity in METs = VO2 max ÷ 3.5, the same unit used for activity intensity in the Compendium of Physical Activities.

By Suhaib Hassan · Reviewed 28 September 2026 against the original validation studies · How CalculatePilot verifies formulas →

A worked example

A 35-year-old with a resting heart rate of 60: predicted max HR = 208 − 0.7 × 35 = 183.5 bpm, so VO2 max ≈ 15.3 × 183.5 ÷ 60 = 46.8 mL/kg/min, or 13.4 METs. Running 2,400 m in 12 minutes gives (2,400 − 504.9) ÷ 44.73 = 42.4 mL/kg/min.

Why VO2 max matters

Cardiorespiratory fitness is one of the strongest predictors of long-term health. A meta-analysis of 33 studies (Kodama et al., JAMA 2009) found each 1-MET higher fitness was associated with about 13% lower risk of death from any cause and 15% lower risk of heart disease. The biggest gains come from moving out of the least-fit group.

Accuracy and safety

All four are estimates; a lab test with gas analysis is the gold standard. The resting heart rate method was developed in trained men and is best for tracking your own trend over time. Measure resting heart rate in the morning before getting up. Walk and run tests are maximal or near-maximal efforts — if you are new to exercise, have heart disease symptoms, or are unsure, check with a doctor before doing one.

Sources

• Uth N, Sørensen H, Overgaard K, Pedersen PK. Estimation of VO2max from the ratio between HRmax and HRrest — the Heart Rate Ratio Method. Eur J Appl Physiol 2004;91:111–115.
• Kline GM, Porcari JP, Hintermeister R, et al. Estimation of VO2max from a one-mile track walk, gender, age, and body weight. Med Sci Sports Exerc 1987;19:253–259.
• Cooper KH. A means of assessing maximal oxygen intake. JAMA 1968;203:201–204.
• Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol 2001;37:153–156.
• Kodama S, Saito K, Tanaka S, et al. Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events. JAMA 2009;301:2024–2035.
• American College of Sports Medicine. ACSM's Guidelines for Exercise Testing and Prescription (1.5-mile run equation).

Frequently asked questions

How accurate is this compared to a lab VO2 max test?expand_more

Field and non-exercise formulas are reasonable estimates but less precise than a supervised lab test with breathing gas analysis. They're most useful for tracking your own changes over time, using the same method each time.

When should I measure my resting heart rate?expand_more

First thing in the morning before getting out of bed gives the most consistent reading. Readings taken later in the day, after caffeine, activity or stress, tend to run higher.

Which method should I use?expand_more

If you can't do a hard effort, use the resting heart rate or Rockport walk test. If you run regularly, the Cooper 12-minute or 1.5-mile run test usually gives a better estimate because it measures actual performance.