Question 1

What is lean body mass?

Accepted Answer

Lean body mass is the total weight of your body minus fat mass. It includes muscle, bone, water, organs, and other non-fat tissues.

Question 2

Which LBM formula is best?

Accepted Answer

The Boer formula is commonly used in clinical settings, but comparing all formulas (Boer, James, Hume) gives a more balanced estimate.

Question 3

What is FFMI?

Accepted Answer

FFMI (Fat-Free Mass Index) shows lean mass relative to height, similar to BMI but for lean tissue. It helps assess muscle development independent of height.

Question 4

Do I need my body fat percentage?

Accepted Answer

No. It's optional. If you don't provide it, the calculator derives body fat % from the average LBM estimate.

Lean Body Mass Calculator