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Both calculators run independently — change the inputs on either side to compare results.
Fitness
VO2 Max Estimator (Resting Heart Rate)
Estimates your VO2 max — the maximum amount of oxygen your body can use during intense exercise — from your resting heart rate and age, with no treadmill test required. It uses the Uth–Sørensen heart-rate-ratio method, a quick proxy for cardiorespiratory fitness.
Fitness
VO2 Max Estimator
Estimate VO2 max (maximum oxygen uptake) in ml/kg/min from a recent running performance — distance, time, and body weight. A field-test approximation of one of the most important cardiorespiratory fitness markers.
Key differences
| VO2 Max Estimator (Resting Heart Rate) | VO2 Max Estimator | |
|---|---|---|
| Category | Fitness | Fitness |
| Inputs required | 2 | 3 |
| Result | Estimated VO2 Max (ml/kg/min) | Estimated VO2 Max (ml/kg/min) |
| What it does | Estimates your VO2 max — the maximum amount of oxygen your body can use during intense exercise — from your resting heart rate and age, with no treadmill test required. It uses the Uth–Sørensen heart-rate-ratio method, a quick proxy for cardiorespiratory fitness. | Estimate VO2 max (maximum oxygen uptake) in ml/kg/min from a recent running performance — distance, time, and body weight. A field-test approximation of one of the most important cardiorespiratory fitness markers. |