Lean Mass Calculator

Calculators

Body composition tools

Estimate lean mass, body fat, FFMI, protein intake, and daily calories with calculators built around the same body-composition workflow.

Lean Mass CalculatorEstimate lean body mass, fat mass, lean mass percentage, and protein target.Core calculatorFFMI CalculatorCalculate fat-free mass index, normalized FFMI, lean mass, and fat mass from height, weight, and body fat percentage.Compare lean mass relative to height after you already know or estimate body fat percentage.Body Fat CalculatorEstimate body fat percentage using the U.S. Navy tape method, then translate it into fat mass and lean mass.Estimate body fat when you do not have a DEXA scan, calipers, or a reliable smart-scale reading.Protein Intake CalculatorSet a daily protein target from body weight or lean body mass for cutting, maintenance, or muscle gain.Turn lean body mass or body weight into a practical daily protein range.BMR and TDEE CalculatorEstimate basal metabolic rate, total daily energy expenditure, and calorie targets from body composition.Translate body composition into a daily calorie estimate for maintenance, fat loss, or muscle gain.Muscle Mass CalculatorEstimate skeletal muscle mass, muscle mass percentage, and your Skeletal Muscle Mass Index (SMI) using the validated Lee (2000) equation.Estimate how much of your body weight is skeletal muscle when you do not have a DEXA or MRI scan.