lbm formula
LBM Formula: How to Calculate Lean Mass
If your goal is better body composition, lean-mass calculation is a useful baseline metric.
How to calculate using Lean Body Mass Calculator
- Enter body weight and body-fat percentage.
- Calculate lean mass by removing fat mass component from total weight.
- Use lean-mass trend for nutrition and training planning.
Lean Body Mass Calculator formula
- Lean body mass = body weight x (1 - body fat%).
- Fat mass = body weight - lean body mass.
- Lean mass % = 100 - body fat%.
Worked example
- Weight 80 kg with 20% body fat.
- Lean body mass = 64 kg; fat mass = 16 kg.
- Track changes over 4-8 week intervals.
Accuracy and interpretation notes
- Lean body mass is not the same as muscle-only mass.
- Use consistent body-fat method for reliable trend comparison.
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