VO₂ Max Estimator
Estimate your maximal oxygen uptake (VO₂ max) from resting heart rate and maximum heart rate — no treadmill test or lab equipment required.
100% client-side · no upload
Estimated VO₂ Max
Fitness category
How to use
- Enter your maximum heart rate (the highest HR you have ever recorded during all-out effort).
- Enter your resting heart rate (measure first thing in the morning before getting up).
- Click Estimate VO₂ Max to see your aerobic capacity score and fitness category.
Related sport tools
- Heart Rate Zones — five training zones from max HR
- Running Pace Calculator — pace and speed conversion
- Training Load Calculator — RPE × duration session stress
- Marathon Time Predictor — race time from a shorter effort
Preguntas frecuentes
- Is this VO₂ max estimator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.