VO2 Max Calculator

VO2 max is the maximum rate at which your body can consume oxygen during intense exercise and is widely regarded as the gold standard measure of cardiovascular fitness. A higher VO2 max means your cardiovascular system can deliver and your muscles can use more oxygen, supporting better endurance performance, faster recovery, and long-term heart health. True VO2 max requires laboratory testing, but this calculator uses the Uth–Sørensen–Overgaard–Pedersen formula — VO2 max = 15 × (HRmax ÷ HRrest) — to provide a practical estimate from two easily measured values: your resting heart rate and maximum heart rate. VO2 max is expressed in milliliters of oxygen per kilogram of body weight per minute (mL/kg/min), and values above 50 for men or 45 for women are generally considered good for recreational fitness. Elite endurance athletes often exceed 60–70 mL/kg/min. Tracking VO2 max over time as you increase your training volume is a meaningful way to monitor aerobic fitness improvements, even without lab access — a falling resting heart rate and a stable or rising max heart rate will show up directly in this estimate as an improving score.

The calculator uses the Uth–Sørensen–Overgaard–Pedersen formula: VO2 max = 15 × (HRmax ÷ HRrest). This formula is derived from the observation that a higher ratio of maximum to resting heart rate correlates with better cardiovascular efficiency and oxygen utilization capacity. For example, with a resting HR of 60 bpm and a max HR of 180 bpm, the estimate is 15 × (180 ÷ 60) = 45 mL/kg/min. A trained runner with a resting HR of 45 bpm and max HR of 195 bpm would estimate 15 × (195 ÷ 45) = 65 mL/kg/min — a result in the excellent range. Maximum heart rate can be estimated as 220 minus age, or measured through a maximal exercise test for greater accuracy. While less precise than a laboratory VO2 max test, this formula provides a useful field estimate that tracks fitness improvements over time.