Lean Body Mass Calculator
Calculate your lean body mass (LBM) using different formulas. Estimate muscle mass, body fat percentage, and track your fitness progress.
Step 1: Personal Information
What is Lean Body Mass?
Lean Body Mass (LBM) is the total weight of your body minus all the weight due to your fat mass. It includes muscles, bones, organs, and water. Knowing your LBM helps track fitness progress and calculate proper nutrition needs.
Step 2: Calculation Options
LBM Formulas
Boer Formula: Most accurate for athletes
James Formula: Common for general population
Hume Formula: Good for older adults
Simple Formula: LBM = Weight × (1 – Body Fat % / 100)
Lean Body Mass Results
Your Lean Body Mass
Formula Comparison
| Formula | Lean Body Mass | Body Fat % | Fat Mass | Accuracy |
|---|
About the Formulas
Boer Formula: Developed in 1984, most accurate for athletes and active individuals
James Formula: Published in 1976, suitable for general population
Hume Formula: Created in 1966, tends to be more accurate for older adults
Simple Formula: Requires body fat percentage input, most personalized when accurate body fat data is available
Lean Body Mass Interpretation Guide
Male Lean Body Mass Ranges (kg)
Female Lean Body Mass Ranges (kg)
Why Lean Body Mass Matters
Lean body mass is crucial for:
- Metabolism: Muscle burns more calories at rest than fat
- Strength & Function: Supports daily activities and athletic performance
- Bone Health: Resistance training increases bone density
- Longevity: Higher muscle mass is associated with longer lifespan
- Disease Prevention: Reduces risk of diabetes, heart disease, and osteoporosis
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