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Lean Mass Calculator

Calculate lean body mass, body fat mass, and full body composition — using body fat %, skinfold measurements, or the Navy tape method, with goal weight and cutting/bulking targets.

LBM = Total Weight − Fat Mass  ·  Fat Mass = Weight × Body Fat %

Basic Information

Weight, height, sex, and age

Body Fat Input Method

Choose how to determine body fat percentage

Goal Body Fat % (Optional)

Project target weight for a goal body fat percentage

Quick Presets

Common body composition scenarios

Composition

Body Fat
Lean mass Fat mass
Lean Mass
Fat Mass
Body Fat %
BMI
Category

BF% Reference (Men)

Essential fat2–5%
Athletic6–13%
Fitness14–17%
Average18–24%
Obese25%+

BF% Reference (Women)

Essential fat10–13%
Athletic14–20%
Fitness21–24%
Average25–31%
Obese32%+