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Understand your estimate
Lean Body Mass Calculator
Calculate your Lean Body Mass (LBM) using your height, weight, and gender. Estimate the weight of your muscles, bones, organs, and body water excluding body fat.
Calculate your lean body mass (LBM), fat free body weight, and estimated body fat mass using your height, weight, and gender.
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How the Lean Body Mass Calculator Works
1
Enter Your Gender
Select your gender for accurate lean body mass estimation.
2
Enter Height
Provide your height in centimeters.
3
Enter Weight
Provide your body weight in kilograms.
4
View Results
See your estimated lean body mass and fat-free body weight.
Lean Body Mass Formula
Male: (0.407 × Weight) + (0.267 × Height) − 19.2 | Female: (0.252 × Weight) + (0.473 × Height) − 48.3
The Lean Body Mass Calculator uses the Boer Formula to estimate fat-free body mass. Lean body mass includes muscles, bones, organs, and body water while excluding body fat.
Example Calculation
Input: Male, Height: 175 cm, Weight: 75 kg
Output: Lean Body Mass ≈ 61.8 kg
Common Uses
- • Body Composition Analysis
- • Weight Loss Tracking
- • Muscle Gain Planning
- • Fitness Assessment
- • Bodybuilding
- • Sports Nutrition
- • Health Monitoring
- • Strength Training
- • Fat Loss Programs
- • Performance Optimization
Questions about this calculator
Lean Body Mass is the weight of everything in your body except body fat, including muscles, bones, organs, and water.
Lean Body Mass helps evaluate body composition, monitor fitness progress, and plan nutrition or training programs.
No. Lean Body Mass includes muscle mass but also includes bones, organs, and body water.
Yes. Resistance training, proper nutrition, and healthy lifestyle habits can increase lean body mass over time.
It provides an estimate based on proven formulas and should be used as a guideline rather than a medical measurement.
Athletes and active individuals often calculate daily protein targets using lean mass rather than total body weight. This approach ensures accurate amino acid delivery for muscle repair without overestimating requirements in individuals carrying higher fat mass.
What lean body mass includes
Lean body mass is total body weight minus estimated fat mass. It includes muscle, bone, organs, body water, and other non-fat tissue, so it should not be interpreted as muscle mass alone.
Why the result is an estimate
Formula-based methods use height, weight, and sex to estimate an average body composition. Hydration, age, training status, pregnancy, and unusually high or low muscularity can make an individual's true value differ substantially.
Using the number safely
Use the estimate for general education and broad trend tracking under consistent measurement conditions. Clinical decisions and medication dosing may require professional assessment or validated measurements such as DEXA or other methods selected by a healthcare provider.
Interpreting estimated lean body mass
Lean body mass is total body weight minus estimated fat mass. Formula-based estimates use combinations of height, weight and sex, so two people with the same result can still have different muscle, bone, organ and body-water composition. Hydration changes, recent meals and measurement error can shift the inputs without representing a real change in muscle tissue.
Use repeated measurements under similar conditions to observe a trend rather than treating one estimate as a diagnosis. Athletes, older adults, pregnant people and anyone with fluid-balance changes may not match the population used to develop a formula. Clinical decisions require an appropriate assessment method and a qualified healthcare professional.
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Reviewed by the DevCalc Editorial Team
This page is maintained through a documented review of formula selection, units, limitations and clear medical disclaimers. DevCalc is founded and maintained by software engineer Aditya Singh. Important financial, health, legal and government figures should still be confirmed with the relevant official source.
This calculator is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare provider for health decisions.