What is the difference between LBM and muscle mass?

Lean body mass includes everything except fat: muscles, bones, organs, water, and connective tissue. Muscle mass is only one component of LBM.

How can I increase my lean body mass?

Strength training, adequate protein intake (1.6-2.2g per kg bodyweight), progressive overload, and sufficient rest are key to building lean mass.

Is the Boer formula accurate?

The Boer formula is one of the most validated LBM estimation methods. It provides a good estimate but for precise measurements, DEXA scans are recommended.

Lean Body Mass Calculator

Calculate your lean body mass using the Boer formula based on gender, height, and weight.

Gender

Weight (kg)

Height (cm)

What is Lean Body Mass?

Lean Body Mass (LBM) is your total body weight minus all fat weight. It includes muscles, bones, organs, water, and everything except stored fat. Knowing your LBM helps with fitness planning, protein intake calculations, and understanding your body composition.

Boer Formula

Males: LBM = 0.407W + 0.267H – 19.2

W = Weight in kg · H = Height in cm

Females: LBM = 0.252W + 0.473H – 48.3

The Boer formula is considered one of the most accurate estimation methods

Why Lean Body Mass Matters

Protein needs: Many nutritionists recommend 1.6-2.2g protein per kg of LBM for muscle building.
Metabolic rate: More lean mass means higher BMR and more calories burned at rest.
Drug dosing: Some medications are dosed based on LBM rather than total weight.
Fitness tracking: Track muscle gains/losses separately from fat changes.

Frequently Asked Questions

LBM includes everything that isn't fat: muscles, bones, organs, blood, and water. Skeletal muscle mass is just the muscles you can see and control. LBM is always higher than muscle mass since it includes other non-fat components.

To increase LBM: (1) Engage in resistance/strength training 3-5 times per week, (2) Eat adequate protein (1.6-2.2g per kg of LBM), (3) Maintain a slight caloric surplus (200-300 extra calories), (4) Get enough sleep (7-9 hours), and (5) Stay hydrated.

The Boer formula is one of the most validated estimation formulas for LBM, but like all estimation methods, it has limitations. It may be less accurate for very muscular individuals, the elderly, or those with unusual body compositions. For precise results, consider DEXA scanning.