Lean Body Mass Calculator
Determine exactly how much of your body weight is lean tissue versus fat mass.
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The Boer Formula
The Boer formula is widely considered the most accurate method for estimating Lean Body Mass in individuals with normal body composition.
Men: 0.407W + 0.267H - 19.2 | Women: 0.252W + 0.473H - 48.3
WWeight in kilograms (kg)
HHeight in centimeters (cm)
Formula Source:
NIH / National Library of MedicineManual Calculation Example (Male)
Let's calculate the LBM for a male weighing **75 kg** with a height of **175 cm** using the Boer formula.
1
Weight Component
Multiply weight by coefficient.
0.407 × 75 = 30.525
2
Height Component
Multiply height by coefficient.
0.267 × 175 = 46.725
3
Subtract Constant
Add components and subtract constant.
30.525 + 46.725 - 19.2
4
Result
Final estimated lean body mass.
LBM ≈ 58.05 kg
Why Track Lean Body Mass?
Tracking Lean Body Mass is superior to tracking weight alone because:
- It Represents True Progress: If you lose weight but your LBM drops, you might be losing muscle, which isn't ideal.
- Metabolic Health: Muscle is active tissue that burns calories. Higher LBM usually means a higher metabolism.
- Medication Dosing: Many anesthetic drugs (like Propofol) are dosed based on LBM to prevent overdose in obese patients.
Frequently Asked Questions
What is Lean Body Mass (LBM)?
Lean Body Mass is the weight of everything in your body except fat. This includes muscle, bone, water, organs, and skin.
How can I increase my Lean Body Mass?
Resistance training (lifting weights) combined with adequate protein intake is the most effective way to increase muscle mass, which is the most variable component of LBM.
Is LBM the same as Muscle Mass?
No. Muscle mass is a component of LBM. LBM includes muscle plus bones, water, and organs. However, changes in LBM usually reflect changes in muscle mass.