Lean Body Mass (LBM)
Health & FitnessCalculate Lean Body Mass (LBM) and Fat-Free Mass in pounds and kilograms using Boer, Hume, and James clinical equations from height, weight, and gender.
Boer LBM · Hume formula 57.8 kg · implied body fat ≈ 23.2%
About this calculator
Lean Body Mass (LBM) represents the weight of all non-fat tissue in your body, including muscle, bone, organs, connective tissue, and water. Tracking LBM during weight loss ensures you are burning body fat while preserving metabolically active skeletal muscle.
This calculator evaluates your lean mass and body fat percentage using validated anthropometric clinical formulas developed by Boer and Hume for men and women.
How It Works & Formula
Boer Formula (Men): LBM = 0.407 × W + 0.267 × H - 19.2. Boer (Women): LBM = 0.252 × W + 0.473 × H - 48.3 (where W is weight in kg and H is height in cm). Fat Mass = Total Weight - LBM.
Related Calculators
View All (22)BMI & Body Weight Category
Calculate Body Mass Index (BMI), prime index, and healthy weight range for adults and children.
BMR & Daily Calorie (TDEE)
Determine Basal Metabolic Rate and Total Daily Energy Expenditure based on activity levels.
Body Fat Percentage (US Navy)
Estimate body fat percentage and lean muscle mass using tape measurements (waist, neck, hip).
Ideal Body Weight Calculator
Compare ideal weight estimates using Devine, Robinson, Miller, and Hamwi medical formulas.