# Lean Body Mass Calculator (lbm Calculator)

## Calculate your lean body weight and body fat percentage using your height and weight

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Lean Body Mass (LBM)

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Boer FormulaLean Body Mass (kg)Lean Body Mass (%)Body Fat (%)
Male 61.51 kg 76.9 % 23.1 %
Female 57.16 kg 71.4 % 28.6 %
James FormulaLean Body Mass (kg)Lean Body Mass (%)Body Fat (%)
Male 62.81 kg 78.5 % 21.5 %
Female 56.48 kg 70.6 % 29.4 %
Hume FormulaLean Body Mass (kg)Lean Body Mass (%)Body Fat (%)
Male 57.9 kg 72.4 % 27.6 %
Female 55.77 kg 69.7 % 30.3 %
Peters FormulaLean Body Mass (kg)Lean Body Mass (%)Body Fat (%)
Child 59.68 kg 74.6 % 25.4 %

## Lean body weight formula

Boer Formula

For Male,

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

For Female,

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

James Formula

For Male,

LBM (kg) = 1.1 * weight [kg] - 128 (weight [kg] / height [cm])^2

For Female,

LBM (kg) = 1.07 * weight [kg] - 148 (weight [kg] / height [cm])^2

Hume Formula

For Male,

LBM (kg) = 0.32810 * weight [kg] + 0.33929 * height [cm] - 29.5336

For Female,

LBM (kg) = 0.29569 * weight [kg] + 0.41813 * height [cm] - 43.2933

Peters Formula (For Children under 14 years)

LBM (kg) = 3.8*[0.0215 *((weight [kg])^0.6469))*((height [cm])^0.7236)]

Lean body weight in % Formula

LBM (%) = (Lean body mass (in kg) / Weight in kg) * 100

Lean body Fat in % Formula

Lean Fat (%) = 100 - lean body mass (lbm) in %

## Know More about Lean body Mass

• Lean body mass is the weight of the human body excluding the fat mass.

• Lean body mass measures weight of organs , muscles, bones, Tissues and body fluids.

• As compared to Lean body Mass, Lean muscle mass is just the weight of muscles and does not include weight of organs, bones, tissues and body fluids. .

## What is Body Fat?

• This is the exact fat percentage in the body which is not lean body mass.

• This is calculated as total weight - (weight of muscles, bones, fluids except fat).

• The normal body fat percentage is between 10% to 30%.

• Athletes and Fitness level Persons will have body fat percentage of 10% to 15%

## Body Fat % Normal Range Table

Body Fat Level Description Body Fat % for Men Body Fat % for Women
Very low level of fat 2 8-10
Essential fat 2 - 5 10 - 13
Athletic Level of Fat 6 - 13 14 - 20
Fitness Level of Fat 14 - 17 21 - 24
Average / Normal Level of Fat 18 - 25 25 - 31
Obesity / High Fat Level > 25 > 32

## Frequently Asked Questions on LBM

• Lean body mass is the weight of the human body excluding the fat mass.
Lean body mass measures weight of organs , muscles, bones, Tissues and body fluids.

• This is the exact fat percentage in the body which is not lean body mass.
This is calculated as total weight - (weight of muscles, bones, fluids except fat).

• BMI gives a measure of body fat using height and weight and does not distinguish between muscle mass and fat mass.
So a high value of BMI may be misleading in persons who have high muscle mass.
Lean body mass measures the mass / weight excluding body fat which is more accurate.

• 75 % - 85 %

• 70 % - 75 %

• The range of lean body mass considered to be healthy is around 75% - 90%.
The range of body fat considered to be healthy is around 10% - 25%

• LBM For Adults has 3 different formulae as given by Boer, James and Hume and known by their names.
There is a separate formula to calculate LBM for children and this is Peters Formula.
As per Boer's Formula,
For Male,
LBM (kg) = 0.407 * weight [kg] + 0.267 * height [cm] - 19.2 .
For Female,
LBM (kg) = 0.252 * weight [kg] + 0.473 * height [cm] - 48.3

• It should be high and in the range of 80% - 90% for men and 70% - 85% for women

• More muscles means higher burn rate of calories and better metabolism.
Also it indicates reasonable bone density.

• Higher fat content in the body leading to obesity and related issues.
Lower bone density could also lead to potential issues.