Lean Body Mass (LBM) Calculator
Estimate lean body mass using the Boer formula for males and females.
How the Lean Body Mass Calculator Works
Lean body mass represents everything in your body except stored fat. This includes muscle, bones, organs, and water. The calculator uses the Boer formula, which adjusts calculations based on sex and provides consistent estimates across a wide range of body types.
Your weight is converted to kilograms when needed, and height can be entered in centimetres or in feet and inches. All calculations occur entirely in your browser and nothing is stored or transmitted.
LBM is often used alongside body fat, BMR, and TDEE calculations for gym planning, nutrition tracking, and physique analysis.
Frequently Asked Questions
What is lean body mass?
Lean body mass includes muscle, organs, bones, and water. It excludes stored fat.
Which formula does this calculator use?
The calculator uses the Boer formula, which is widely used for estimating lean mass.
Can I enter height in feet and inches?
Yes. The tool converts feet and inches to centimetres automatically.
Is my information stored?
No. Everything is calculated locally on your device only.