lean body weight, LBW , the calculator uses the U. Navy Method Body fat formula and then subtracts the fat percent from the total mass to produce the final estimate. The body fat percent formulas used are as follows.

Note the instructions on obtaining accurate measurements. In calculating lean body mass with these equations the standard error of the estimate is ~3. These error bounds on the estimate have to be taken into account when using the calculation results for the amount of muscle, ligaments and essential fat which constitutes the lean body mass.

The inputs can be weight pounds or kilograms for the total body weight, and feet and inches, centimeters or meters for body height. The age is in years.

There are standards for leanness derived from scientific studies of certain populations. The minimal lean body mass for the reference man Reference values using lean mass index as a measure of lean body mass standardized for height are most useful in practice.

A set of such values are provided in the tables below. Note that a bigger LMI means a leaner body. A larger lean body mass naturally translates mostly to more muscle per unit of body weight and also to a smaller body fat percentage.

Additionally, our lean mass calculator automatically calculates and outputs the reference percentile by using a more precise version of these tables. Values in the tables are adopted with some grouping and averaging from Table 3 of "Reference standards for lean mass measures using GE dual energy x-ray absorptiometry in Caucasian adults" [5] and apply to Caucasians only.

It should also be mentioned that DXA estimates are more accurate than estimates produced using body measurements so the table should be used as a rough guide only. It should be noted that lean body mass LBM is not the same as fat-free body mass FFM , although the terms may sometimes be used interchangeably.

LBM is a theoretical percentage which includes both non-fat tissue bones, muscles, ligaments, etc. That essential fat is mostly contained in the central nervous system, bone marrow, and internal organs.

FFM on the other hand is the body mass devoid of all extractable fat, including essential fats. Lean body mass is also not equivalent to muscle mass, though sometimes this is mistakenly believed. LBM includes different non-fat tissues like bones, ligaments, and muscles [1].

So, while it does contain muscle mass, the lean body weight also contains a substantial proportion of other body parts so using it interchangeably with muscle mass is, strictly speaking, incorrect.

In everyday speech some may use "muscle mass" to mean "lean body mass" and that is totally fine given all participants understand what is meant.

While this online lean body weight calculator is a good tool, it is not perfect. Its advantage is that it is very easy to use and decently accurate. Other, more expensive and more accurate methods are available, such as DEXA Dual-Energy X-ray Absorptiometry, a.

DXA , CT and MRI scans so-called 3D scans , body density underwater weighing. The most popular of these is DEXA, as it is accessible, easy to perform and reliable. The author suggests that this formula is applicable for children aged years old or younger.

The formula is used to compute an eLBM based on an estimated extracellular volume eECV as follows:. Lean body mass and fat free mass are often used interchangeably. While this is unlikely to cause issues in most cases, the two are not exactly the same. Lean body mass includes the combined mass of bones, muscles, water, ligaments, tendons, and internal organs.

Internal organs include some essential fat and the mass of this fat is included within the measurement of lean body mass. Although internal organs also have surrounding subcutaneous fat, this fat is not included within the measurement of lean body mass.

Fat free mass is calculated as the difference between total body mass and all fat mass including essential fat. This is the difference between fat free mass and lean body mass. Subtracting the mass of essential fat from lean body mass yields fat free mass.

US units metric units other units. Gender male female Age 14 or younger? yes no Height feet inches Weight pounds Height cm Weight kg. Result The lean body mass based on different formulas: Formula Lean Body Mass Body Fat Boer 1 Fitness and Health Calculators.

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Further information: Body composition § Measuring body composition. doi : PMC PMID Pages BioMed Research International. ISSN The American Journal of Clinical Nutrition. Journal of Clinical Pathology.

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ft in. meter cm. Am J Physiol ; F 2. HMSO 3. ft in meter cm. lbs kg. Female Male. Some people say having more fat than muscle offers a survival advantage because excess fat can provide energy when the body is stressed.

However, this benefit is hypothetical. Low muscle mass speeds up age-related muscle loss and reduces physical ability. This increases the risk of injury and disability. Strength training, or weight training , is the best way to build muscle mass.

This type of exercise strengthens your muscles by forcing them to work against resistance. Cardio is still important, though.

Aerobic exercise , like jogging or dancing, supports muscle growth and slows age-related muscle loss. Gaining and keeping muscle mass also depends on good nutrition. This includes eating enough nutrient-dense calories to fuel your body. Protein, which helps build and repair muscle, is particularly important.

The amount of protein you need depends on your level of physical activity. Generally, 10 to 35 percent of your daily calories should come from protein. Examples of high-protein foods include:.

You also need enough carbohydrates to fuel your muscles. By eating whole foods, like vegetables and eggs, you can help your muscles stay healthy and strong.

Muscle mass is a part of your lean body mass. Typically, the more muscle you have, the less prone you are to injury, chronic disease, and early death. Muscle mass also indicates physical function, including mobility and balance.

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