Lean Body Mass Calculator

What is Lean Body Mass (LBM)?

Lean Body Mass (LBM) refers to your total body weight excluding fat mass. It comprises muscles, bones, water, organs, and other non-fat tissues.

How is Lean Body Mass Calculated?

LBM can be estimated using several formulas that consider weight, height, and gender.

Formulas for Calculating LBM

• Boer Formula:

  LBM (male) = (0.407 × weight in kg) + (0.267 × height in cm) - 19.2
  LBM (female) = (0.252 × weight in kg) + (0.473 × height in cm) - 48.3

• James Formula:

  LBM (male) = (1.1 × weight in kg) - (128 × (weight² / height²))
  LBM (female) = (1.07 × weight in kg) - (148 × (weight² / height²))

• Hume Formula:

  LBM (male) = (0.32810 × weight in kg) + (0.33929 × height in cm) - 29.5336
  LBM (female) = (0.29569 × weight in kg) + (0.41813 × height in cm) - 43.2933

Example Calculation

Using the Boer Formula, for a male weighing 75 kg and 180 cm tall:

LBM = (0.407 × 75) + (0.267 × 180) - 19.2
LBM = 30.525 + 48.06 - 19.2 = 59.39 kg

Why is Lean Body Mass Important?

• Fitness Assessment: Tracks changes in muscle mass and physical fitness over time.
• Health Indicator: A higher LBM often indicates better strength, metabolism, and overall health.
• Caloric Needs: LBM directly affects Basal Metabolic Rate (BMR) and daily energy requirements.