Lean Body Mass Calculator

Lean Body Mass (LBM) measures the weight of your body minus all fat tissue (including muscles, bones, organs, and body water).

Body & Weight• Boer, James & Hume Equations

Lean Body Mass Calculator

Calculate your lean body mass (LBM) using the Boer, James, and Hume formulas.

Gender

Height50 – 250 cm

Weight20 – 350 kg

Lean Muscle & Organ MassStandard Lean Mass

58kg

Standard Lean Mass

Low Lean Mass

30-49.9

Standard Lean Mass

50-74.9

Athletic Mass (>75 kg)

75-100

Boer58 kg

James59 kg

Hume54.4 kg

Evidence-based estimations. Consult a physician for personalized guidance.

Clinical Formula & Calculation Standard

Official clinical definitions and validated mathematical models

Clinical Lean Body Mass (LBM) Equations

Boer: Men 0.407W + 0.267H - 19.2 | Women 0.252W + 0.473H - 48.3 James: Men 1.1W - 128(W/H)² | Women 1.07W - 148(W/H)² Hume: Men 0.3281W + 0.3393H - 29.53 | Women 0.2957W + 0.4181H - 43.29

Lean Body Mass represents total body weight minus fat tissue mass, comprising skeletal muscle, organs, bone, and total body water.

Clinical Insights & Practical Usage

Lean body mass typically constitutes 70%–90% of total body weight in healthy adult men and 60%–80% in healthy adult women.
Used extensively in critical care and anesthesiology for hydrophilic drug dosing.

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