Is lean body mass the same as muscle?

No. It also includes bone, organs and water.

Can I increase lean body mass?

Training and nutrition guided by a qualified coach can support it.

Does Visbody measure lean mass?

Visbody reports muscle, fat and water, whole body and by segment.

What Is Lean Body Mass? Definition and How It Is Measured

What is lean body mass?

Lean body mass is everything in the body that is not fat: muscle, bone, organs and water.

Short answer

Lean body mass is body weight minus fat mass: muscle, bone, organs and water. Skeletal muscle mass is only a part of it, so the two numbers are not the same. Impedance devices estimate both, and the trend over time matters more than one reading.

Last updated: November 2026

The definition

Lean body mass = body weight minus fat mass. Fat-free mass is a very similar term, and terminology differs between sources.

Lean mass vs skeletal muscle mass

Skeletal muscle mass is only the muscle attached to the skeleton. It is part of lean mass, not the whole of it.

Coach guiding a man through battle rope training

How it is measured

Common methods are bioelectrical impedance, DEXA and skinfolds. Impedance devices give estimates, best used to track change over time.

BIA vs 3D scan vs DEXA

Why coaches track it

Lean mass helps coaches see whether a training or nutrition plan is keeping muscle while fat comes down. Reports are for reference, not a medical diagnosis.

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