Body Composition calculators
BMI, body fat, ideal weight and body shape.
BMI Calculator
Body mass index from height and weight, with your healthy weight range.
Body Fat Calculator (US Navy)
Estimate body fat percentage from tape measurements.
Ideal Weight Calculator
Compare ideal weight from four classic formulas.
Lean Body Mass Calculator
Split your weight into lean mass and fat mass.
Waist-to-Hip Ratio Calculator
Check where your body stores fat and the related health risk.
Waist-to-Height Ratio Calculator
A simple rule: keep your waist under half your height.
Body Surface Area Calculator
BSA by Mosteller, DuBois and Haycock formulas.
Body Roundness Index Calculator
A shape-based index of visceral fat from waist and height.
BMI Prime & Ponderal Index
How far your BMI sits from the upper healthy limit of 25.
Body Frame Size Calculator
Small, medium or large frame from height and wrist size.
Weight Change Percentage Calculator
Measure how much your weight has changed, in kg and as a percentage.
Healthy Weight Range Calculator
The weight range that gives a BMI of 18.5 to 24.9 for your height.
Adjusted Body Weight Calculator
A dosing and nutrition weight for people who are well above ideal weight.
Total Body Water Calculator
Estimate your body water using the Watson formula.
Body Fat from BMI Calculator
Estimate body fat percentage from BMI, age and sex (Deurenberg).
Fat-Free Mass Index Calculator
Lean mass relative to height, normalised for comparison.
Relative Fat Mass Calculator
A body fat estimate using only height and waist.
A Body Shape Index (ABSI) Calculator
Waist risk adjusted for height and weight.
Waist Circumference Risk Calculator
Check waist size against sex-specific risk thresholds.
Estimated Height from Knee Height
Estimate stature from knee height (Chumlea), useful when standing height is not possible.
Arm Muscle Area Calculator
Estimate muscle area in the upper arm from circumference and triceps skinfold.
Skeletal Muscle Index Calculator
Appendicular muscle mass scaled to height squared.
Conicity Index Calculator
Body shape and central fat distribution from waist, weight and height.
Body Adiposity Index Calculator
Estimate body fat percentage from hip circumference and height.
Hume Lean Body Mass Calculator
Lean mass estimate using the Hume equations for drug dosing and nutrition.
Related guides
What Is BMI and What Does It Really Tell You?
BMI is a quick screening number. Here is what it measures, where it falls short and how to use it sensibly.
Weight & Body CompositionHow to Find a Healthy Weight Range for Your Height
There is no single perfect weight. Learn how clinicians use ranges and several formulas.
Weight & Body CompositionBody Fat Percentage Explained
What counts as lean, average or high body fat, and how to estimate yours at home.