Health

Lean Body Mass Calculator

Estimate lean body mass from weight and body fat.

Calculated Output

Lean body mass 64

Fat mass 16

Formula: LBM = weight × (1 − body fat%/100)

Step-by-Step Breakdown

1. Values used:

2. Weight = 80

3. Body fat = 20 %

5. Lean body mass = 64

6. Fat mass = (80 / 100) x 20 = 0.8 x 20 = 16

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The math behind it

LBM = weight − (weight × body fat% ÷ 100).

80 kg at 20% fat → 64 kg lean.

Why track it?

Preserving lean mass during weight loss keeps your metabolism higher.