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Body Adiposity  Index

Lean Body Mass Calculator (lbm Calculator)

Calculate your lean body weight and body fat % using your height and weight


   
   
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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

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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 (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.

  • 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 for Men and Women

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

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  • 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.