Screens
Simple steps, clear results
Enter a few measurements and BodyCalc shows your estimate with the context to read it.
Calculators
Seven calculators, one app
Every calculator is free. Each one names the formula it uses, so you know where the numbers come from.
BMI Body Mass Index
Your weight relative to your height, with your adult BMI category and a healthy weight range for your height.
Method: CDC and NHLBI adult categories
WHtR Waist-to-Height Ratio
Compares your waist to your height. A ratio under 0.5 is commonly cited as a general guide.
Method: waist ÷ height (Ashwell et al., 2012; NICE)
BMR Basal Metabolic Rate
The calories your body uses at rest, with example daily calorie, macro and water estimates.
Method: Mifflin-St Jeor equation
TDEE Total Daily Energy Expenditure
Your BMR scaled by the activity level you choose, from sedentary to extra active.
Method: Mifflin-St Jeor × activity factor
Body Fat Body Fat Estimate
Estimated body fat percentage from your height, neck and waist — plus hip for women.
Method: U.S. Navy circumference method (Hodgdon & Beckett, 1984)
Lean Mass Lean Body Mass
Your weight without the estimated fat mass, derived from the body fat estimate.
Method: from the U.S. Navy body fat estimate
FFMI Fat-Free Mass Index
Your lean mass relative to your height, normalized for height.
Method: Kouri et al., 1995
Why BodyCalc
Private by design
Your measurements are for your calculations — nothing else.
- No sign-up neededOpen the app and calculate. There is nothing to sign up for.
- Stays on your iPhoneMeasurements, results and history are saved on your device, not on our servers.
- Free, ads optionalEvery calculator is free. A one-time purchase removes ads — no subscription.
- History & progressSave results and follow your weight over time.
- Metric or imperialWork in cm · kg or ft/in · lb.
- Sources you can checkEvery formula links to its published source, with a clear medical disclaimer.
Get BodyCalc
Free on the App Store for iPhone.
