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Free Fitness Calculators
Free calculators for body composition, calories, heart rate and running performance. Each one shows the published formulas side by side, runs in your browser with no sign-up, and can be shared or embedded. Results are estimates, not medical advice.
3 calculators
Fitness calculators for body composition
Weight, BMI, frame size and body fat, each with several published formulas side by side.
3 calculators
Fitness calculators for training
Heart rate zones, race predictions and age-graded results for runners and walkers.
5 calculators
Fitness tests and VO2max
One page per test, as fitness exams and coaches ask for a specific protocol: run, walk or treadmill.
Treadmill tools
All treadmill tools →Training on a treadmill?
Turn these numbers into treadmill speed, incline and calories.
