Lean Body Mass Calculator
Calculate your lean body mass using the Boer formula.
Supports metric and imperial units for both men and women.
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Lean Body Mass
Lean Body Mass (LBM) is your total body weight minus fat mass. It includes muscle, bone, organs, and water.
Boer Formula:
For Males:
LBM (kg) = 0.407 × weight (kg) + 0.267 × height (cm) - 19.2
For Females:
LBM (kg) = 0.252 × weight (kg) + 0.473 × height (cm) - 48.3
Imperial conversions:
- Weight:
kg = lbs × 0.453592 - Height:
cm = inches × 2.54
Why LBM matters:
- Medication dosing: Some drugs are dosed based on lean mass
- Fitness goals: Track muscle gain separate from fat loss
- Metabolic rate: LBM is the primary driver of basal metabolism
- Body composition: A better health indicator than weight alone
Typical LBM percentages:
- Males: 70–90% of total body weight
- Females: 60–80% of total body weight
Note: The Boer formula is considered one of the most accurate LBM estimation formulas. For precise measurements, consider DEXA scanning.