What is the difference between LBM and IBW?

LBM is the actual calculated fat-free mass. IBW is a standardized weight estimate from height. LBM varies by individual muscle and organ mass.

Which formula is best for LBM?

James formula: males = 1.1×weight - 128×(weight/height)². Boer formula: males = 0.407×weight + 0.267×height - 19.2. Boer is more accurate.

LBM is used for renal drug dosing, anesthesia calculations, nutritional support prescribing, and metabolic rate estimation.

Calculate lean body mass (LBM = total weight - fat mass) — essential for precise drug dosing and nutritional assessment.

Use the full interactive calculator below, or

Body Fat %

Medical

Ideal Body Weight

Medical

Adjusted Body Weight

Medical

BSA Calculator

Medical