Compare calculators
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
Running Pace Calculator
Calculate running pace from total time and distance, converted to seconds per kilometer or per mile depending on unit selection. Use it to track training run efficiency, plan race goal paces, and compare performance across different distances.
Key differences
| VO2 Max Estimator (Resting Heart Rate) | Running Pace Calculator | |
|---|---|---|
| Category | Fitness | Fitness |
| Inputs required | 2 | 5 |
| Result | Estimated VO2 Max (ml/kg/min) | Pace (sec/unit) |
| 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. | Calculate running pace from total time and distance, converted to seconds per kilometer or per mile depending on unit selection. Use it to track training run efficiency, plan race goal paces, and compare performance across different distances. |