Lean Body Mass Calculator
Enter sex, height and weight to estimate lean body mass (LBM) and fat mass (kg) with the Boer formula.
Input Data
Results
At a glance:Boer: men LBM = 0.407×weight + 0.267×height − 19.2; women LBM = 0.252×weight + 0.473×height − 48.3 (weight kg, height cm). Fat mass = weight − LBM.
Formula
Men: leanKg = 0.407×weightKg + 0.267×heightCm − 19.2.
Women: leanKg = 0.252×weightKg + 0.473×heightCm − 48.3.
fatKg = weightKg − leanKg.
How to Use
- Select sex and enter height (cm) and weight (kg).
- Get lean body mass and fat mass (kg) instantly.
Case Studies
170cm/65kg male
lean = 0.407×65 + 0.267×170 − 19.2 = 26.46 + 45.39 − 19.2 = 52.65 kg.
fat = 65 − 52.65 = 12.35 kg.
FAQ
What is LBM used for?
LBM drives metabolism and strength and is used in some drug dosing and fitness progress tracking.
Why different formulas by sex?
Men and women differ in frame and body-composition proportions, so Boer uses separate coefficients for accuracy.
How does it relate to body fat %?
This tool gives LBM/fat mass in kg; the body fat calculator gives the percentage — they convert into each other.
Related Tools
References
Content reviewed by the Calculatorism editorial team. Results are for reference only; please refer to the relevant authorities for the official figures.