Lean Body Mass Calculator

Computes a person's estimated lean body mass (LBM) and body fat (BF) based on weight, height, gender, and age.
For adults, the Boer, James, and Hume formulas are shown. For children (14 or under), the Peters formula is added.

Gender:

Male Female

Age 14 or younger?

Yes No

Height (cm):

Weight (kg):

Result

The lean body mass based on different formulas:

Formula	Lean Body Mass	Body Fat
Boer¹
James²
Hume³
Peters⁴