Lean Body Mass Calculator

Free calculate lean body mass (LBM) from weight and body fat percentage. Get instant, accurate results with our easy-to-use calculator.

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Enter information to calculate lean body mass

About Lean Body Mass

  • • LBM = Total Weight - Fat Mass
  • • Fat Mass = Weight × (Body Fat % / 100)
  • • Includes muscle, organs, bones, water
  • • Used for medication dosing and metabolic calculations