Lean Body Mass (LBM) Calculator
Calculate your Lean Body Mass (LBM) and Body Fat Percentage with our free calculator. Using the clinically validated Boer formula, this tool helps you understand your body composition—separating fat mass from muscle, bone, and other lean tissues. Perfect for fitness tracking, weight loss planning, and health assessment.
How to Use This Tool
1. Select Gender
Male or Female
2. Enter Weight
kg or lbs
3. Enter Height
cm or inches
4. Get Results
View LBM, Body Fat %, and more
Formula & Calculation
Results are rounded to 1 decimal place for clarity.
Quick Reference LBM Table
| Gender | Weight (kg) | Height (cm) | LBM (kg) | Body Fat % |
|---|---|---|---|---|
| Male | 70 | 175 | 58.4 | 16.6% |
| Male | 80 | 180 | 64.9 | 18.9% |
| Female | 60 | 165 | 43.2 | 28.0% |
| Female | 70 | 170 | 49.4 | 29.4% |
| Female | 80 | 175 | 55.6 | 30.5% |
How We Calculated
- Input: We collected your gender, weight, and height.
- Conversion: Weight is converted to kg, height to cm.
- Formula: Applied the Boer formula (gender-specific) to calculate LBM.
- Body Fat %: Calculated using (Weight − LBM) / Weight × 100.
Why Trust This Tool?
Clinically validated method
No server storage
Use instantly
Works on all devices
Latest fitness insights
No hidden charges
Accuracy & Standards
This calculator uses the Boer formula, which is widely used in clinical settings and research for estimating Lean Body Mass. Results are rounded to 1 decimal place. The tool is for educational and fitness tracking purposes—not a substitute for professional medical advice.
Unit Relationship
1 kg = 2.20462 lbs
1 cm = 0.393701 in
1 lb = 0.453592 kg
1 in = 2.54 cm
Learn About Lean Body Mass
What is LBM?
Lean Body Mass (LBM) is the total weight of your body minus all fat mass. It includes muscles, bones, organs, water, and other non-fat tissues.
Why LBM Matters
LBM is a key indicator of fitness and health. Higher LBM is associated with better metabolic health, stronger bones, and improved physical performance.
LBM vs Muscle Mass
LBM includes all non-fat tissues (muscles, bones, organs, water). Muscle mass is a subset of LBM. LBM is a broader indicator of body composition.
Real-World Examples
- Example 1: 30-year-old male, 75 kg, 178 cm → LBM: 61.7 kg, Body Fat: 17.7%
- Example 2: 40-year-old female, 65 kg, 165 cm → LBM: 46.3 kg, Body Fat: 28.8%
- Example 3: 25-year-old male, 85 kg, 183 cm → LBM: 70.2 kg, Body Fat: 17.4%
Limitations of This Tool
- Provides estimates—individual body composition varies.
- Does not account for bone density or muscle distribution.
- Not suitable for children, pregnant women, or bodybuilders with extreme muscle mass.
- For more precise measurement, consider DEXA scans or bioelectrical impedance analysis.
Trust & Privacy
We take your privacy seriously. This tool:
- Does not store data on any server
- All calculations happen locally in your browser
- No cookies are used for this tool
References
- Boer P. Estimated lean body mass as an index for normalization of body fluid volumes in humans. Am J Physiol. 1984.
- American Council on Exercise. Body Composition Testing. ACE Fitness.
- National Institutes of Health. Body Composition and Health. NIH.gov.
Editorial Process
The Healthtus editorial team, consisting of fitness experts and certified nutritionists, reviews this tool regularly to ensure accuracy and alignment with the latest exercise science. We update the content and references as new research emerges.
Last reviewed: July 2026