Calculators
Short sums, in the browser.
Each one names the source of its numbers. Inputs stay on your device. None of this is medical advice.
All calculators
- Movement
Walking pad steps
Belt speed and minutes, plus height or a measured step length. Estimated steps, distance, and calories, with the formula written out.
- Grip
Dead hang test
Age, sex, and hang time. No rating table. A 2026 study mean sits beside your time, not as a grade.
- Cardio fitness
VO2max by age
Age, sex, and a VO2max value. A percentile band from the FRIEND treadmill standards, in plain words.