Lean Mass Calculator

Lean mass guide

Dry Lean Mass: What It Is and How to Estimate It

Dry lean mass is lean body mass with the water removed — the protein and mineral content of your body. Here is what it means, why it matters, and how to estimate it.

Last updated: · Reviewed by the Lean Mass Calculator editorial team

Who this page is for

People who saw 'dry lean mass' on a body-composition scan (InBody, BIA) and want to understand it.

Start with the main lean mass calculator, then use the related tools below when you need body fat, FFMI, protein, or calorie context.

What dry lean mass means

Dry lean mass (DLM), sometimes written as lean dry mass, is the part of your lean body mass that remains after all body water is removed — essentially the protein and mineral (bone) content of your body. If lean body mass is muscle, bone, organs, and the water inside them, dry lean mass is that same tissue with the water subtracted out.

You most often see the term on InBody and other bioelectrical impedance (BIA) printouts, where the machine splits your weight into body water, dry lean mass, and body fat mass. Dry lean mass is what is left of your fat-free tissue once the water compartment is accounted for separately.

Because water is roughly 70-75% of lean mass, dry lean mass is a much smaller number than lean body mass. A person with 140 lb of lean mass might have only 35-45 lb of dry lean mass.

How dry lean mass relates to lean body mass

The relationship is straightforward: Lean Body Mass = Total Body Water + Dry Lean Mass. Add your body water back to your dry lean mass and you get your full lean body mass. Add fat on top of that and you reach total body weight.

Dry lean mass is considered a stable, high-quality indicator of muscle and bone because it strips out water, which fluctuates daily with hydration, sodium, and carbohydrate intake. A rising dry lean mass over months is strong evidence of real tissue gain rather than water shifts.

This site's calculator estimates total lean body mass rather than dry lean mass, since dry lean mass requires a body-water measurement that comes from a BIA device or lab method. But your lean body mass is the starting point — dry lean mass is simply that figure with water removed.

Frequently asked questions

What is dry lean mass?

Dry lean mass is your lean body mass with all body water removed — the protein and mineral content of your body, mainly muscle protein and bone. It is reported on InBody and other BIA scans alongside body water and fat mass.

What is the difference between dry lean mass and lean body mass?

Lean body mass includes body water; dry lean mass does not. Lean Body Mass = Total Body Water + Dry Lean Mass. Since water is about 70-75% of lean tissue, dry lean mass is a much smaller number.

Is dry lean mass the same as muscle?

Not exactly. Dry lean mass is the water-free protein and mineral content of all your lean tissue, including bone. It correlates closely with muscle protein but also counts bone mineral, so it is not a pure muscle measurement.

How do I increase dry lean mass?

A rising dry lean mass reflects real gains in muscle protein and bone. Progressive resistance training plus adequate protein (roughly 1.6-2.2 g per kg of lean mass) is the proven way to increase it over months.

Sources & references

The estimates on this page use published lean body mass equations and clinical reference ranges. See the full reference charts on the lean body mass chart hub.