Lean Body Mass (LBM) Calculator
Calculate your Lean Body Mass (LBM)—the combined weight of your muscles, bones, organs, and body water—using validated anthropometric equations developed by Boer, James, and Hume.
How to Use Lean Body Mass (LBM) Calculator
Select Gender
Choose Male or Female.
Enter Current Weight & Height
Provide measurements in pounds/inches or kilograms/centimeters.
View Body Composition
See your Lean Body Mass, total fat mass, and estimated body fat percentage.
About Lean Body Mass (LBM) Calculator
Lean Body Mass represents your total weight minus adipose body fat. Tracking LBM is essential for strength athletes and dietitians because preserving lean mass during weight loss ensures that weight shed comes exclusively from fat rather than skeletal muscle tissue.
Key Features
- Calculates LBM using Boer, James, and Hume clinical formulas
- Outputs Lean Mass, Fat Mass, and estimated Body Fat %
- Calculates Fat-Free Mass Index (FFMI) for athletic benchmarking
- Dual unit support: Imperial (lbs) and Metric (kg)
- Completely private on-device execution
Frequently Asked Questions
Related Tools
More in Health & Fitness ToolsBody Fat Percentage Calculator
Measure body fat percentage using the official US Navy circumference tape method.
Ideal Body Weight Calculator
Calculate your healthy ideal body weight range using Devine, Robinson, Miller, and Hamwi medical formulas.
Calorie Deficit & Weight Loss Calculator
Calculate daily calorie deficit targets, required daily calorie intake, and projected goal dates for healthy weight loss.