Calculate your Lean Body Mass (LBM) using multiple scientific formulas to better understand muscle mass and fat-free weight.
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What Is Lean Body Mass?

Lean Body Mass represents your total body weight minus fat mass. It includes muscles, bones, organs, and water, making it a key indicator of metabolic health.

How This Calculator Works

This calculator uses established medical formulas (Boer, James, and Hume) based on height, weight, and gender to estimate fat-free mass.

Why Lean Body Mass Matters

Higher lean mass is associated with better metabolism, strength, and long-term health. It is often used in fitness planning and medical assessments.

Advice & Notes

These results are estimates. Hydration, age, and training level can affect real lean mass. For medical use, consult a healthcare professional.

FAQs

Which formula is best? Boer is generally most accurate for adults.
Is this the same as muscle mass? No, lean mass includes more than just muscle.
Can lean mass change? Yes, through training, nutrition, and aging.