Lean Body Mass Calculator estimates the weight of everything in your body except fat — including muscles, bones, organs, and water. LBM is widely used in fitness, nutrition planning, and medical assessments.
This tool calculates lean body mass using three validated formulas: Boer, James, and Hume. Enter your height, weight, and gender to get accurate results instantly.
Lean Body Mass Calculator
How This Lean Body Mass Calculator Works
Lean Body Mass (LBM) represents everything in your body except fat — including muscle, bone, organs, and water. It is more accurate than BMI for assessing health and fitness.
Formulas Used
- Boer Formula: Preferred for clinical use
- James Formula: Uses weight-to-height ratio
- Hume Formula: Widely used for body composition
Why LBM Matters
LBM is important for calorie calculation, muscle analysis, medication dosing, and athletic performance.
Examples
- 180 cm, 80 kg (male): LBM ≈ 62–65 kg
- 165 cm, 60 kg (female): LBM ≈ 45–48 kg
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FAQs – Lean Body Mass Calculator
What is lean body mass?
Lean Body Mass includes muscles, bones, organs, and all non-fat tissue.
Is LBM the same as muscle mass?
No. Muscle mass is part of LBM, but LBM also includes bones and organs.
Which LBM formula is best?
The Boer formula is considered most accurate for adults.
Is LBM important for fitness?
Yes. LBM affects metabolism, strength, and calorie needs.