LBM (Lean Body Mass)
Calculates your Lean Body Mass (LBM) using the Boer formula, estimating the weight of your body excluding fat.
Waiting for data
Enter your data above to instantly see your analysis result.
Lean Body Mass (LBM) Tool – Boer Formula
The LBM Tool allows you to estimate your Lean Body Mass (LBM) based on your weight, height, and gender. It uses the Boer formula, a widely recognized equation for estimating body mass excluding fat tissue.
Lean Body Mass includes muscles, bones, organs, and body water — everything in your body except fat.
What Is Lean Body Mass (LBM)?
Lean Body Mass (LBM) represents the total weight of your body minus fat mass. It is commonly used in:
- Nutrition planning
- Fat loss and body recomposition
- Sports performance analysis
- Body composition assessment
- Metabolic and medical calculations
Unlike BMI, which evaluates body weight relative to height, LBM provides a more detailed estimate of body composition.
Boer Formula for LBM
The Boer equation differs for men and women:
For Men:
LBM = 0.407 × weight (kg) + 0.267 × height (cm) − 19.2
For Women:
LBM = 0.252 × weight (kg) + 0.473 × height (cm) − 48.3
The result is expressed in kilograms (kg).
The Boer formula is valued for its simplicity and reasonable accuracy in the general population.
Why Is Knowing Your LBM Important?
Understanding your Lean Body Mass helps you:
- Estimate body fat percentage more accurately
- Determine fat mass vs. non-fat mass
- Calculate caloric needs more precisely
- Track muscle gain during strength training
- Monitor body recomposition progress
In many diet and fitness programs, calorie requirements are calculated based on LBM rather than total body weight.
How the LBM Tool Works
- Enter your body weight.
- Enter your height.
- Select your gender.
- The tool automatically converts metric or imperial units.
- Your Lean Body Mass is calculated and displayed in kilograms.
The tool supports kilograms, pounds, centimeters, meters, inches, and feet.
live_help Frequently Asked Questions (FAQ)
What does my LBM result mean?
Your LBM result represents the estimated weight of your body excluding fat. It includes muscles, bones, organs, and body fluids.
Is Lean Body Mass the same as muscle mass?
No. Muscle mass is only one component of Lean Body Mass. LBM includes all non-fat tissues in the body.
Is the Boer formula accurate?
The Boer formula provides a reliable estimate for most individuals. However, it does not replace professional body composition assessments such as DEXA scans or bioelectrical impedance analysis (BIA).
Why does the formula differ for men and women?
Men and women have different physiological body compositions. Therefore, separate equations are used to provide more accurate estimates.
Can I calculate body fat percentage using LBM?
Yes. If you know your total body weight, you can estimate body fat percentage by subtracting LBM from total weight and calculating the proportion of fat mass.
Is LBM important during weight loss?
Yes. During weight loss, the goal is typically to reduce fat mass while preserving as much Lean Body Mass as possible.
Can overweight individuals have high LBM?
Yes. As total body weight increases, Lean Body Mass may also increase because the body must support greater overall mass.
Does strength training increase LBM?
Yes. Resistance training can increase Lean Body Mass by promoting muscle growth.