Other less precise methods for calculating lean body weight are bioelectric impedance analysis, total body water measurement, total body counting, and neutron activation. The most popular of these is DEXA, as it is accessible, easy to perform and reliable. DXA), CT and MRI scans (so-called 3D scans), body density (underwater weighing). Other, more expensive and more accurate methods are available, such as DEXA (Dual-Energy X-ray Absorptiometry, a.k.a. Its advantage is that it is very easy to use and decently accurate. While this online lean body weight calculator is a good tool, it is not perfect.
Fat-free body mass is typically 80-90% of the total, reaching 95% in some athletes. FFM on the other hand is the body mass devoid of all extractable fat, including essential fats. That essential fat is mostly contained in the central nervous system, bone marrow, and internal organs. LBM is a theoretical percentage which includes both non-fat tissue (bones, muscles, ligaments, etc.), but also some non-sex-specific essential fat which is up to 3-4% of the total body mass for men and up to 5-7% for women.
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. 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. 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" and apply to Caucasians only. Lean body mass index reference values for Caucasian women: LMI percentiles per age group, women Age group / LMI Percentile Lean body mass index reference values for Caucasian men: LMI percentiles per age group, men Age group / LMI Percentile Additionally, our lean mass calculator automatically calculates and outputs the reference percentile by using a more precise version of these tables. A larger lean body mass naturally translates mostly to more muscle per unit of body weight and also to a smaller body fat percentage. Note that a bigger LMI means a leaner body. A set of such values are provided in the tables below. Reference values using lean mass index as a measure of lean body mass standardized for height are most useful in practice. Even the leanest women rarely fall below 10-12% body fat. For women the lower limit for the reference woman equals about 12% essential fat. Marathon runners can go down to 1% body fat. The minimal lean body mass for the reference man (61.7 kg) includes 3% of essential body fat. There are standards for leanness derived from scientific studies of certain populations. The inputs can be weight pounds or kilograms for the total body weight, and feet and inches, centimeters or meters for body height. The lean body mass calculator also outputs the lean mass index (LMI) in kg per meter squared (kg/m -2) which is a measure similar to BMI but for lean mass instead of total body mass. 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.
In calculating lean body mass with these equations the standard error of the estimate is ~3.5 percent points in either direction, meaning that about 68% of estimated body fat percentages will fall within ☓.5 of the true BFP, while ~95% of estimated BFPs will fall within ☗ of it. Note the instructions on obtaining accurate measurements.
Navy Method Body fat formula and then subtracts the fat percent from the total mass to produce the final estimate. lean body weight, LBW), the calculator uses the U.S.
#BODY MASS INDEX CALCULATOR WITH AGE AND GENDER HOW TO#
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