Free tools · Body Composition
Lean Body Mass Calculator
Free · No signupFat-free mass and fat mass from scale weight and body-fat percentage, in lb or kg.
Your stats
Lean body mass
144.6lb
Fat mass
31.7 lb
Scale weight
176.4 lb
Body fat
18%
Questions
Does this measure muscle?
Lean mass includes muscle, bone, and organs — not muscle alone. Treat it as fat-free mass, not a DEXA regional scan.
Is this medical advice?
No. These calculators are for wellness and fitness planning only. Talk to a physician before changing how you eat or train.
Related tools
FFMI Calculator
Fat-Free Mass Index from weight, height, and body fat — how muscular you are relative to your frame.
Body Fat Calculator
U.S. Navy tape-measure method. Neck, waist, and hip circumferences in, body-fat percentage and category out.
Protein Calculator
Daily protein in grams from body weight and goal — cut, maintain, or lean bulk — plus a per-meal split.
Hammr Fitness is for wellness and fitness purposes only. It is not medical advice. Consult a physician before starting any exercise or nutrition program. If you have a medical emergency, call emergency services.