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Feb 10, 2026

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Lean Body Mass (LBM) Calculator

Determine your body's fat-free mass. Knowing your Lean Body Mass is essential for accurately planning your nutritional needs, especially protein intake.

What is Lean Body Mass?

Lean Body Mass (LBM) represents the weight of everything in your body except for fat. This includes your muscles, bones, organs, skin, and water. Understanding your LBM is more insightful than just tracking body weight, as it helps you see if you're losing fat while preserving muscle during a diet.

Formula Used (Boer Equation)

This calculator uses the Boer formula, a widely recognized method for estimating LBM.

  • Men: $LBM = (0.407 \times \text{Weight in kg}) + (0.267 \times \text{Height in cm}) - 19.2$
  • Women: $LBM = (0.252 \times \text{Weight in kg}) + (0.473 \times \text{Height in cm}) - 48.3$

Why LBM Matters

  • Guides protein intake for muscle maintenance and growth.
  • Helps assess body composition more accurately than weight alone.
  • A key metric in sports nutrition and clinical health assessments.

Disclaimer: This calculator provides an estimate for educational purposes and should not be considered medical advice. Consult a healthcare professional for a comprehensive health evaluation.

Calculate Your LBM