Lean Body Mass Calculator

The Boer formula is a widely used estimate based on height and weight; methods like DEXA scans are more precise but require special equipment.

Lean body mass is useful for setting protein targets, tracking body composition changes, and calculating metrics like FFMI.

Estimate your lean body mass — muscle, bone, organs, and water — using the Boer formula.

Gender

Height (cm)

Weight (kg)

Lean Body Mass

Estimated remaining weight as body fat.

Fat mass as a share of total weight.

How Lean Body Mass Is Calculated

This tool uses the Boer formula, a well-established equation based on height and weight:

Men: LBM = 0.407 × weight(kg) + 0.267 × height(cm) − 19.2

Women: LBM = 0.252 × weight(kg) + 0.473 × height(cm) − 48.3

Lean body mass is your total body weight minus fat mass, including muscle, bone, organs, and water.

It's a widely used estimate based on height and weight; methods like DEXA scans are more precise but require special equipment.

It's useful for setting protein targets, tracking body composition changes, and calculating metrics like FFMI.

Last Updated: July 2026