What is a healthy lean body mass percentage?

Lean body mass percentage = 100% - body fat %. Healthy body fat: men 10–20%, women 18–28%. Athletes typically have higher LBM (lower body fat) than these ranges.

Why does lean body mass matter?

LBM drives your basal metabolic rate (BMR) — more muscle mass = higher metabolism. It's also used to calculate medication dosing, protein requirements, and body composition goals.

Lean Body Mass Calculator

Enter weight, height, and gender to calculate lean body mass and estimated body fat percentage.

Calculate your lean body mass (LBM) — the weight of everything in your body except fat, including muscle, bone, organs, and water. Uses the Boer formula, which is more accurate than the James or Hume formulas for most adults.

Last reviewed: April 2026Report an error

Body Weight (lbs)

Height (inches)

Gender

Lean Body Mass

135.6 lbs

LBM: 135.6 lbs. Fat mass: 44.4 lbs. Body fat: 24.7%. (Boer formula)

Lean Body Mass

135.6 lbs

Fat Mass

44.4 lbs

Body Fat %

24.7%

How to Use This Lean Body Mass Calculator

Enter your body weight in pounds.
Enter your height in inches.
Select your gender.
Read lean body mass, fat mass, and estimated body fat percentage.

Frequently Asked Questions

: Lean body mass percentage = 100% - body fat %. Healthy body fat: men 10–20%, women 18–28%. Athletes typically have higher LBM (lower body fat) than these ranges.
: LBM drives your basal metabolic rate (BMR) — more muscle mass = higher metabolism. It's also used to calculate medication dosing, protein requirements, and body composition goals.

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Lean Body Mass Calculator

How to Use This Lean Body Mass Calculator

Frequently Asked Questions

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