Body Composition Calculators
BMI, body fat percentage, lean mass, ideal weight, and more — understand your body composition with evidence-based tools.
BMI Calculator — Body Mass Index
Calculate your Body Mass Index (BMI) and see which weight category you fall into.
Calculate now →Body Fat Calculator — US Navy Method
Estimate your body fat percentage using the US Navy circumference method — no calipers needed.
Calculate now →Lean Body Mass Calculator
Calculate your lean body mass (fat-free mass) from your weight and body fat percentage.
Calculate now →Ideal Weight Calculator
Find your healthy ideal weight range using multiple evidence-based formulas for your height and gender.
Calculate now →Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio and assess your cardiovascular risk based on fat distribution.
Calculate now →Body Shape Calculator
Identify your body shape type — apple, pear, hourglass, rectangle, or inverted triangle — from body measurements.
Calculate now →FFMI Calculator — Fat-Free Mass Index
Calculate your Fat-Free Mass Index — a normalized measure of muscle development that accounts for height.
Calculate now →Muscle Gain Calculator — Realistic Potential
Estimate your realistic muscle gain potential per month and year based on gender and training experience.
Calculate now →Body Recomposition Calculator
Plan a simultaneous fat loss and muscle gain strategy. Calculate calorie and macro targets for body recomposition.
Calculate now →Water Weight Estimator — Total Body Water
Estimate your total body water and water weight breakdown from your age, gender, and body weight.
Calculate now →About Body Composition Calculators
Body composition tools use validated field methods — the US Navy circumference method for body fat, Devine and Hamwi formulas for ideal weight, and WHO standards for waist-to-hip ratio risk classification. These estimates provide actionable context beyond the scale number alone.