VO2 Max Calculator
Estimate your VO2 Max — the gold standard measure of cardiovascular endurance fitness.
About VO2 Max
VO2 max is the maximum rate at which your body can use oxygen during intense exercise. It is the best single measure of cardiovascular fitness. Elite endurance athletes score 60–85 mL/kg/min; average untrained adults 30–45 mL/kg/min.
Accuracy The Uth-Sørensen resting heart rate method estimates VO2 max within ±10–15% of lab-measured values for average adults. Athletes and very sedentary individuals may see larger deviations. For a precise measurement, a supervised graded exercise test (VO2 max test) is recommended.
VO2 Max Fitness Categories (mL/kg/min)
| Category | Males | Females |
|---|---|---|
| Superior | ≥ 55 | ≥ 49 |
| Excellent | 51–54 | 45–48 |
| Good | 45–50 | 38–44 |
| Fair | 38–44 | 31–37 |
| Poor | 35–37 | 28–30 |
| Very Poor | < 35 | < 28 |
What to do with your result
- Compare your score to the age and gender norms in the table above to understand where you stand relative to the general population.
- If your score is 'Fair' or below, prioritize Zone 2 aerobic training (3–4 sessions/week, 30–45 minutes) to build your aerobic base over 8–12 weeks.
- Add 1–2 HIIT sessions weekly — try 4×4 minute intervals at 90–95% max heart rate — to directly boost VO2 max.
- Re-test in 10–12 weeks after consistent training to track your improvement. Record your resting HR each morning to monitor fitness trends.
Frequently Asked Questions
What is VO2 max and why does it matter?
VO2 max is the maximum volume of oxygen your body can consume per minute per kilogram of body weight (mL/kg/min). It is the gold standard measure of cardiovascular fitness and aerobic capacity. Higher VO2 max is strongly associated with lower risk of cardiovascular disease, longer lifespan, and better athletic performance.
What is a good VO2 max for my age and gender?
VO2 max naturally declines with age. For males aged 30–39, a good score is 45–50 mL/kg/min; excellent is 51–55+. For females aged 30–39, good is 38–44; excellent is 45–49+. Elite endurance athletes (marathon runners, cyclists) typically score 60–85 mL/kg/min.
How accurate is the Uth-Sørensen resting heart rate formula?
The Uth-Sørensen formula (VO2 max = 15 × HRmax/HRrest) provides a rough estimate with typical error of ±10–15% compared to lab testing. It is most accurate for moderately fit adults. Athletes and sedentary individuals may see larger deviations. For precise measurement, a graded treadmill or cycle ergometer test in a lab is needed.
How can I improve my VO2 max?
VO2 max improves most effectively through high-intensity interval training (HIIT) and sustained aerobic exercise. Effective strategies include: 4×4 minute intervals at 90–95% max heart rate with 3-minute recovery periods, long slow distance (LSD) runs at Zone 2 heart rate, and progressive overload — increasing training volume by no more than 10% per week.
How often should I re-test my VO2 max estimate?
Re-test every 8–12 weeks to track progress. To get a consistent comparison, measure your resting heart rate under the same conditions each time (morning, before coffee, after at least 5 minutes lying still). Significant improvements in VO2 max typically take 8–12 weeks of consistent aerobic training.
This calculator is for educational purposes only. Consult a qualified healthcare professional for medical advice.