VO2max Calculator

VO2max Rating Scale

What is VO2max?

VO2max is the maximum rate at which your body can consume oxygen during intense exercise, measured in millilitres of oxygen per kilogram of bodyweight per minute (ml/kg/min). It's considered the gold standard for measuring aerobic fitness and cardiovascular endurance capacity.

How accurate is this VO2max estimate?

Race-based VO2max estimates using the Jack Daniels formula are generally accurate to within 5–10% of lab-measured values. Accuracy improves when you race at a true all-out effort on a flat course in good conditions. Factors like hills, heat, wind, and pacing strategy can all affect the estimate.

How can I improve my VO2max?

VO2max responds best to high-intensity interval training (HIIT) at 90–100% of your maximum heart rate. Classic workouts include 4×4-minute intervals, 1km repeats, and track sessions. Consistent aerobic base building also gradually raises your ceiling. Most athletes see 10–20% improvement within a training year.

What is a good VO2max for my age?

For men aged 20–29, average is around 44 ml/kg/min; good is 52+; elite runners reach 70–85. For women aged 20–29, average is around 38 ml/kg/min; good is 45+; elite women reach 60–72. VO2max naturally declines about 10% per decade after age 25, but training can largely offset this.

How does race-based testing compare to a lab VO2max test?

Lab testing uses a treadmill or bike with a metabolic analyser measuring actual oxygen consumption — it's the most accurate method. Race-based formulas are a very practical and free alternative. They work best for trained runners who race at maximum effort. If you're a beginner or raced conservatively, the estimate will be lower than your true VO2max.