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# How To Calculate Lean Body Mass (LBM)?

How do you calculate lean body mass (lbm)?

## Lean Body Mass (LBM)

Lean Body Mass (LBM) is a part of body composition. LBM is calculated by subtracting body fat weight from total body weight. LBM=BWâˆ’BF. It is measured in terms of density. In general, the lean body mass is 60-90% of the total body mass. Men have higher lean body mass than women. LBM is calculated for the purpose of prescribing anaesthetic drugs. LBM is also helpful to make sure you are losing only fat and no muscle.

Many formulas have been developed for estimating the lean body mass. The following are some of them.
Lean Body Mass (LBM) Formula for Adults
The Boer Formula:
Men:
LBM = 0.407 x weight(in kg) + 0.267 x height(in cm) - 19.2
Women:
LBM = 0.252 x weight(in kg) + 0.473 x height(in cm) - 48.3

The James Formula:
Men:
LBM = 1.1 x weight(in kg) - 128 x (weight(in kg) / height(in cm))2
Women:
LBM = 1.07 x weight(in kg) - 148 x (weight(in kg) / height(in cm))2

The Hume Formula:
Men:
LBM = 0.32810 x weight(in kg) + 0.33929 x height(in cm) - 29.5336
Women:
LBM = 0.29569 x weight(in kg) + 0.41813 x height(in cm) - 43.2933

Lean Body Mass (LBM) Formula for Children
The Peters Formula:
The author suggested that this formula fit for children of 13-14 years old or younger.
LBM = 3.8 x 0.0215 x weight(in kg)0.6469 x height(in cm)0.7236