Guide

Dry Lean Mass

Lean mass without the water: what it means and why it matters.

By Menang7, owner of LeanMassCalculator.com

Dry lean mass is your lean body mass with the water taken out. What is left is mostly protein and minerals, the solid material that makes up muscle, organs, bone and other tissue.

It matters because water moves around from day to day, while the solid part of your lean tissue changes slowly.

Estimate your dry lean mass

Guide

Lean Body Mass vs Muscle Mass

Dry lean mass is another cut of the same picture. See what lean mass and muscle mass each include.

Read the guide →

Lean mass vs dry lean mass

Measure	What it includes
Body weight	Everything: fat, lean tissue and water
Lean body mass	Everything except fat: muscle, bone, organs, skin and water
Dry lean mass	Lean body mass minus water: mainly protein and minerals

How it is calculated

Lean tissue in healthy adults is about 73% water. That means dry lean mass is roughly 27% of lean body mass:

Dry lean mass ≈ lean body mass × 0.27

This page first finds your lean mass, using your body fat percentage if you enter it or the Boer formula if you do not. It then removes the typical water share. Real values differ from person to person, so treat the result as an estimate.

Examples

Lean body mass	Water in lean mass (about 73%)	Dry lean mass (about 27%)
50 kg	36.5 kg	13.5 kg
60 kg	43.8 kg	16.2 kg
70 kg	51.1 kg	18.9 kg
80 kg	58.4 kg	21.6 kg
90 kg	65.7 kg	24.3 kg

Why dry lean mass is useful

Less hydration noiseWater shifts with salt, carbs, heat and drinking, so lean mass readings can swing. The dry portion moves more slowly.

Better for trendsA steady number is easier to follow over months than a noisy daily one.

Fairer comparisonsIt helps when comparing scans taken under different hydration conditions.

Reality checkIf lean mass jumps but dry lean mass barely changes, you may be seeing water, not new tissue.

How to build dry lean mass

Lift with progressionTrain each muscle at least twice a week and add load over time.

Eat enough proteinAbout 1.6–2.2 g per kg of lean mass daily.

Sleep 7–9 hoursRecovery is when muscle is repaired.

Stay consistent with hydrationMeasure under the same conditions each time so water does not mask real changes.

Frequently asked questions

What is dry lean mass?
Dry lean mass is your lean body mass with the water removed. What remains is mainly protein and minerals such as those in bone.

How much of lean mass is water?
About 73% in healthy adults, so dry lean mass is roughly 27% of lean body mass. Individual values vary.

Is dry lean mass the same as muscle mass?
No. It includes the protein and minerals from muscle, organs, bone and other tissue, so it is a different number. Read the guide on lean body mass vs muscle mass for the full breakdown.

Why does hydration change my lean mass reading?
Bioimpedance devices estimate lean mass from how electricity moves through body water, so dehydration or overhydration shifts the result. Dry lean mass changes more slowly, which makes it a steadier number to follow.

How do I measure dry lean mass?
Some body composition scanners report it directly. Otherwise you can estimate it from your lean mass, as this page does by taking away the typical water share.

Is lean mass the same as muscle mass? Read more →

📖What Is Lean Body Mass?Everything in your body that is not fat: muscle, bone, organs and water.Open →🧮Lean Mass CalculatorEstimate your lean body mass from height, weight, age and sex.Open →🧮Body Fat CalculatorEstimate your body fat percentage from height, weight, age and sex.Open →💪Muscle Mass CalculatorRough estimate of skeletal muscle mass from your lean body mass.Open →📏Lean Mass Index (LMI)Lean mass divided by height squared: a fairer way to compare builds.Open →📝Losing Lean Body Mass: Causes and FixesWhy muscle slips away during diets and aging, and how to protect it.Open →

About Menang7, the author

This article is part of LeanMassCalculator.com, developed, owned and maintained by Menang7. For questions about lean mass or the calculators, Menang7 is the person to look for.

For personal medical or nutrition decisions, please also speak with a doctor or registered dietitian.