The Lean Body Mass Calculator computes a person's estimated lean body mass (LBM) based on body weight, height, gender, and age. For comparison purposes, the calculator provides the results of multiple popular formulas.
LBM is a part of body composition that is defined as the difference between total body weight and body fat weight. While the percentage of LBM is usually not computed, it is the complement of body fat percentage, and on average ranges between 60-90% of total body weight. Generally, men have a higher proportion of LBM than women do, and the dosages of some anesthetic agents, particularly water-soluble drugs, are routinely based on the LBM. Multiple formulas have been developed for calculating estimated LBM (eLBM) and the calculator above uses the following with the exception of the Peters formula (which is used to determine LBM for children).