Lean Body Mass Calculator
Estimate lean body mass with the Boer formula from weight, height and sex.
Runs 100% in your browser — nothing is uploaded.
Result
Formula
Boer: men 0.407w + 0.267h − 19.2 · women 0.252w + 0.473h − 48.3
About this calculator
Estimate lean body mass (LBM) from body weight and body fat percentage, and derive fat mass and lean-to-fat ratio. Useful for fitness tracking, body composition assessment, and setting realistic health goals. Lean body mass is calculated by subtracting fat mass from total body weight.
How to use
- 1
Select your sex (Male or Female).
- 2
Enter your weight in kilograms and height in centimeters.
- 3
Click Calculate to see your lean body mass and estimated body fat.
Frequently asked questions
What is lean body mass?
Lean body mass is the total weight of your body minus fat mass. It includes muscles, bones, organs, and water.
How do I measure body fat percentage?
Common methods include skinfold calipers, bioelectrical impedance scales, DEXA scans, and hydrostatic weighing. Each has different accuracy and availability.
Is lean body mass the same as muscle mass?
No. Lean body mass includes all non-fat tissues, not just muscle. Muscle mass is a subset of lean body mass.
Please note: Results are estimates for general information only and are not professional or medical/financial advice.