Estimate your fat-free mass using three established formulas.
Lean body mass (LBM) is total body weight minus fat mass. The Boer (1984), James (1976), and Hume (1966) formulas use height and weight to estimate LBM without body fat measurements. LBM is used for drug dosing, metabolic rate calculations, and fitness assessments. Results vary by formula; averaging provides a reasonable estimate.