Lean Body Mass Calculator
Advanced body composition analysis for fitness professionals.
What is Lean Body Mass (LBM)?
Lean Body Mass is the total weight of your body minus all the weight due to your fat mass. It includes the weight of your organs, skin, bones, water, and muscles. Understanding your LBM is crucial for athletes and fitness enthusiasts as it provides a more accurate picture of body composition than total weight alone.
How is LBM Calculated?
Our calculator uses three of the most scientifically validated formulas to provide a comprehensive estimate:
- Boer Formula: Developed in 1984, this is widely used in clinical settings for its reliability across different body types.
- James Formula: Introduced in 1976, this formula is particularly effective for individuals with standard body compositions.
- Hume Formula: Created in 1966, this remains a gold standard for predicting lean mass from height and weight.
Why LBM Matters for Your Fitness Goals
Tracking LBM helps you ensure that your weight loss is coming from fat, not muscle. It also helps in calculating your Basal Metabolic Rate (BMR), as muscle tissue burns more calories at rest than fat tissue. By monitoring these numbers, you can fine-tune your nutrition and training for peak performance.