Free tools
Useful fitness numbers, minus the friction.
Fast calculators with clear context. No signup, no ads, and no pretending one number tells the whole story.
- Available now01
BMI Calculator
Work out your Body Mass Index in metric or imperial, and see what the number does and doesn't tell you.
Open calculator - Coming soon02
TDEE Calculator
Estimate the calories you burn per day from height, weight, age and activity level.
- Coming soon03
One-Rep Max Calculator
Estimate your one-rep max from a set you have already done.
- Coming soon04
Body Fat Calculator
Estimate body fat percentage from tape measurements.
- Coming soon05
Barbell Plate Calculator
Work out which plates to put on each side for a target weight.