VO₂ max is the gold-standard measure of aerobic fitness. You don't need a lab to get a solid estimate — a 12-minute all-out run and this calculator will do it.
The Cooper test
Developed for the US military, the Cooper test asks you to cover as much ground as possible in 12 minutes. Distance maps cleanly onto VO₂ max, making it one of the most accessible field assessments available.
Why it matters
Beyond predicting race performance, VO₂ max is strongly associated with cardiovascular health and longevity. Improving it — and slowing its age-related decline — is one of the highest-value goals in fitness.
Frequently asked questions
It varies by age and sex. For a 30-something, roughly 46–50+ ml/kg/min is excellent for men and 38–43+ for women. Elite endurance athletes reach 70–85.
Field tests like the 12-minute Cooper run estimate it from distance covered: VO₂ max ≈ (metres − 504.9) ÷ 44.73. It's a good approximation given a genuine all-out effort.
Combine high-intensity intervals near your max heart rate with plenty of easy aerobic volume. Consistency over months, not single sessions, drives the gains.