Lean Body Mass Calculator

What lean body mass tells you

Lean body mass (LBM) is everything that isn't fat — muscle, bone, organs, and water. Tracking LBM over time gives a clearer picture of whether a bulk or cut is actually changing your muscle mass, rather than just your scale weight.

You'll need a body fat percentage to run this calculator — get one from the body fat calculator if you don't already have a measurement.

Where these numbers come from

The formulas and default values in this calculator are based on:

• Standard lean body mass formula (total weight x (1 - body fat percentage))

These are planning estimates for training purposes. Check with a coach, trainer, or physician before starting a new program or maxing out.