如何计算Lean Body Mass
learn.whatIsHeading
Lean Body Mass (LBM) is total body weight minus fat mass. It includes muscle, bone, organs, and water. Used in clinical dosing, fitness tracking, and metabolic rate estimation.
公式
LBM (kg) = Weight × (1 − body_fat%/100); LBM (men) = 1.1 × weight − 4.8 × height (simplified)
- BW
- Body weight (kg)
- %BF
- Body fat percentage (%)
- LBM
- Lean Body Mass (kg)
分步指南
- 1LBM = Total weight × (1 − body fat fraction)
- 2Boer formula (men): LBM = 0.407×W + 0.267×H − 19.2
- 3Boer formula (women): LBM = 0.252×W + 0.473×H − 48.3
- 4James formula alternative: LBM(men) = 1.1×W − 128×(W/H)²
例题解析
输入
80kg total, 20% body fat
结果
LBM = 80 × (1−0.20) = 64 kg lean mass
常见问题
What is lean body mass?
Everything except fat: muscle, bone, water, organs. More useful than total weight for athletic performance.
Why is LBM important?
Determines calories for maintenance, strength capacity, metabolic rate. Athletes focus on LBM, not total weight.
Can LBM increase without weight gain?
Yes—if muscle increases and fat decreases (same weight). Requires resistance training and good nutrition.