HEALTH · VO2MAX
VO2max Calculator
Estimate your VO₂max (maximal oxygen uptake) using the Cooper 12-minute run, Rockport 1-mile walk test, or the heart rate ratio method. Get your cardiovascular fitness category.
Category thresholds are simplified from ACSM guidelines (ACSM's Guidelines for Exercise Testing and Prescription, 11th ed., 2021). Field-test estimates carry ±3–6 ml/kg/min error; lab testing provides the gold-standard measure.
About This Calculator
VO₂max — the maximum volume of oxygen your body can use per minute per kilogram of body weight — is the gold-standard measure of cardiovascular fitness. This calculator estimates your VO₂max from three field tests: the Cooper 12-minute run, the Rockport 1-mile walk test, or the heart rate ratio method. Choose the test that matches what you have available.
How It Works
Each method uses a different measurable input to predict your aerobic capacity. The Cooper test is simplest (distance only); the Rockport test accounts for age, weight, sex, walk time, and heart rate for a more individualized estimate; the HR-ratio method requires only your resting and maximum heart rate and is suitable for athletes who know those values. Fitness categories are simplified from ACSM guidelines (ACSM's Guidelines for Exercise Testing and Prescription, 11th edition, 2021).
The Formula
VO₂max = (distance_m − 504.9) / 44.73 [Cooper]
- distance_m
- metres covered in a 12-minute run
Frequently Asked Questions
- What is a good VO₂max?
- ACSM thresholds vary by age and sex. As a simplified guide for adults: below 35 ml/kg/min is considered poor, 35–42 is fair, 42–52 is good, and above 52 is excellent. Elite endurance athletes often exceed 70 ml/kg/min.
- How accurate are field-test VO₂max estimates?
- Field tests carry ±3–6 ml/kg/min error compared to a laboratory graded exercise test (VO₂max test on a treadmill or cycle ergometer). They are useful for tracking trends over time, not as a medical diagnostic.
- Can I improve my VO₂max?
- Yes. Consistent aerobic training — particularly high-intensity interval training (HIIT) and zone-2 steady-state cardio — increases VO₂max in most individuals over 6–12 weeks. Genetics set a ceiling, but most untrained people have substantial room to improve.