Lean Body Mass Calculator
Free online Lean Body Mass Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
LBM = Total Weight x (1 - Body Fat%/100). Boer Formula: Men: 0.407xW + 0.267xH - 19.2. Women: 0.252xW + 0.473xH - 48.3. LBM includes everything except fat.
Example Calculations
Athletic Male
Input: Weight: 180 lbs, Body fat: 12%
Result: LBM: 158.4 lbs, Fat mass: 21.6 lbs
Active Female
Input: Weight: 140 lbs, Body fat: 22%
Result: LBM: 109.2 lbs, Fat mass: 30.8 lbs
Fitness Goal
Input: Weight: 200 lbs, BF: 25%, Target BF: 15%
Result: Current LBM: 150 lbs, Target weight: 176.5 lbs
About This Calculator
Free online lean body mass calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our lean body mass calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
What is lean body mass?
Total weight minus all fat. Includes muscles, bones, organs, water, skin.
How is LBM calculated?
LBM = Total Weight x (1 - Body Fat%/100). Or use the Boer formula.
Why LBM matters?
Determines basal metabolic rate, affects drug dosing, key fitness metric. Higher LBM = faster metabolism.
Increase lean body mass?
Resistance training + protein (1.6-2.2 g/kg) + sufficient calories + sleep + progressive overload.
LBM vs muscle mass?
LBM includes everything except fat. Muscle mass is specifically skeletal muscle. LBM is always higher.