Free · Boer 1984 · Private
Lean Body Mass Calculator
Estimate your fat-free body mass — the part of you that burns calories, builds strength, and keeps you moving.
Your lean body mass—kg
Frequently asked questions
What is Lean Body Mass?
Total body weight minus all body fat. Includes muscle, bone, organs, water. The metabolically active mass.
Why is LBM important?
Higher LBM = higher BMR = more calories burned at rest. Important for athletes, sarcopenia screening, and dosing.
Boer vs Hume?
Both 1984 equations. Boer is slightly more accurate for clinical use; Hume tends to over-estimate LBM in women.