Lean Body Mass (LBM) Calculator
Determine your Lean Body Mass to optimize your nutrition and supplement intake. Calculate exactly how much of your weight is muscle, bone, and water vs. body fat.
Precision Nutrition Tracking
When calculating protein requirements or setting up a diet, using total body weight is flawed because fat tissue doesn't require the same maintenance calories as muscle. This tool uses established formulas (Boer, James, Hume) based on your height, weight, and gender to estimate your true Lean Body Mass (LBM) for pinpoint nutritional accuracy.
Why Use Our Lean Body Mass Calculator?
- Better Dieting: Calculate macros based on active tissue, not fat.
- Multiple Formulas: Cross-references standard medical formulas for accuracy.
- Metric & Imperial: Supports both pounds/inches and kilograms/centimeters.
- Strict Privacy: Your biometric data is processed entirely offline.
How to Use the Lean Body Mass Calculator
Select your biological gender.
Enter your current height and total body weight.
Click 'Calculate LBM'.
Review your estimated Lean Body Mass and Body Fat Percentage.
Frequently Asked Questions
LBM is crucial for athletes. Protein intake and resting metabolic rate should be calculated based on lean mass, not total mass.
These formulas provide a highly accurate clinical estimate. However, for absolute precision, a DEXA scan is required.
No, calculations run locally via JavaScript. Your metrics are completely private.
All file processing is performed locally in your web browser. We do not upload, store, or view your data.