# Lean Body Mass Calculator

Lean Body Mass Calculator

There are a few reasons why you might want to use a lean body mass calculator. Have you ever wondered why slim but muscular people may weigh more than plump ones? We’ve all heard people say “muscle weighs more than fat”, but is that really true? What does the muscle weight depend on? If you want an answer to these questions, you should know how to calculate lean body mass (LBM).

Lean body mass (LBM) is a part of body composition that is defined as the difference between total body weight and body fat weight. This means that it counts the mass of all organs except body fat, including bones, muscles, blood, skin, and everything else. While the percentage of LBM is usually not computed, it on average ranges between 60-90% of total body weight. Generally, men have a higher proportion of LBM than women do. The dosages of some anesthetic agents, particularly water-soluble drugs, are routinely based on the LBM. Some medical exams also use the LBM values. For body fitness and routine daily life, people normally care more about body fat percentage than LBM. To compute body fat, consider using our body fat calculator or ideal weight calculator.

Multiple formulas have been developed for calculating estimated LBM (eLBM) and the calculator above provides the results for all of them.

## How to calculate lean body mass

There are multiple lean body mass equations (and they vary between sexes as well). We’re using the Boer formula, which is said to be the most accurate.

LBM (men) = 0.407 * weight [kg] + 0.267 * height [cm] – 19.2

LBM (women) = 0.252 * weight [kg] + 0.473 * height [cm] – 48.3

However, if you know your fat concentration, you can determine your exact LBM, according to this simple formula:

Lean Body Mass = Body Weight – (Body Weight * Body Fat %)

You will need to: