General · Health
Lean body mass calculator.
Estimate your lean body mass (fat-free mass) using the Boer formula — just height, weight, and sex, no tape measure required.
Inputs
Your lean body mass
Fill the form and press Calculate LBM.
Understanding lean body mass
Lean body mass (LBM) is your total body weight minus fat mass — muscle, bone, organs, and water. The Boer formula estimates it from height, weight, and sex alone, so it's useful when you don't have a tape measure or body-fat scale on hand.
Formula (Boer, 1984)
- Men: LBM = (0.407 × weight in kg) + (0.267 × height in cm) − 19.2
- Women: LBM = (0.252 × weight in kg) + (0.473 × height in cm) − 48.3
This is an equation-based estimate, distinct from the circumference-based US Navy method used in our Body Fat Calculator. Neither replaces a DEXA scan or hydrostatic weighing for precise body composition.
Disclaimer
This calculator provides estimates for educational purposes only and is not a substitute for professional medical advice. Individual body composition varies; consult a healthcare provider for precise measurement.