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CalculatorLean Mass CalculatorLean body mass (LBM) is your total body weight minus your fat mass: LBM = body weight − (body weight × body fat %). Staring at the scale only tells you total gravity, not what you're made of. It's frustrating to work hard and not know if you're losing fat or just starving your muscles. Calculate your actual lean body mass, fat mass, and exact daily protein target using trusted clinical formulas (Boer, James, and Hume).CalculatorFFMI CalculatorCalculate fat-free mass index, normalized FFMI, lean mass, and fat mass from height, weight, and body fat percentage.CalculatorBody Fat CalculatorEstimate body fat percentage using the U.S. Navy tape method, then translate it into fat mass and lean mass.CalculatorProtein Intake CalculatorSet a daily protein target from body weight or lean body mass for cutting, maintenance, or muscle gain.CalculatorBMR and TDEE CalculatorEstimate basal metabolic rate, total daily energy expenditure, and calorie targets from body composition.CalculatorMuscle Mass CalculatorEstimate skeletal muscle mass, muscle mass percentage, and your Skeletal Muscle Mass Index (SMI) using the validated Lee (2000) equation.HubLean Mass GuideA complete guide to lean body mass formulas, body-fat inputs, muscle mass, FFMI, protein, and tracking.GuideLean Mass Calculator for MenEstimate male lean body mass, fat mass, lean mass percentage, and protein targets with sex-specific formulas.GuideLean Body Mass for Women: Calculator & AveragesCalculate lean body mass for women with sex-specific formulas, then see how much lean body mass women should have by age and body fat percentage.GuideLean Body Mass Calculator in KilogramsCalculate lean body mass in kilograms from metric height, body weight, sex, and optional body fat percentage.GuideLean Body Mass Calculator in PoundsCalculate lean body mass in pounds and kilograms from imperial body weight, height, and optional body fat percentage.GuideLean Mass Calculator With Body Fat PercentageUse measured body fat percentage to calculate lean mass directly instead of relying on height-weight formulas.