   # BMI Body Mass Index Calculator

This calculator provides calculation of BMI (Body Mass Index) in US imperial (ft, in, lb) or metric units (m, kg).

Select imperial (US) or metric units:

Imperial        Metric

ft, in (feet, inches)
:

ft        in

lb (pounds):

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## BMI Category Table

 BMI ( body mass index ) Category Table: Severely underweight less than 16.5 BMI Underweight body from 16.5 to 18.4 BMI Normal body from 18.5 to 24.9 BMI Overweight body from 25 to 30 BMI Obesity (Class I) from 30.1 to 34.9 BMI Obesity (Class II) from 35 to 40 BMI Obesity (Class III) over 40 BMI
 Example BMI for a person with height = 5 ft 3 inch : 92 lb at 5′3″ = 16.30 BMI 100 lb at 5′3″ = 17.71 BMI 120 lb at 5′3″ = 21.25 BMI 160 lb at 5′3″ = 28.34 BMI 190 lb at 5′3″ = 33.65 BMI 220 lb at 5′3″ = 38.97 BMI 260 lb at 5′3″ = 46.05 BMI

Body mass index (BMI) is a body weight (in kg) divided by the square of his height (in meters, metric) and measured in kg/m2. There is a corrective coefficient 703 used In order to calculate the index in imperial units (inches and pounds). BMI is used to find a normal person's body weight (so called healthy weight) based on a person's height. BMI is a measurement which estimates a proportion of person's weight and height. Body mass index is often used as diagnostic index to identify if individual is obese, overweight, normal or underweight. BMI (also called Quetelet index) was invented by Adolphe Quetelet (a Belgian scientist and mathematician) in 19th century (between years 1830 and 1850).
Sample conversion: Somebody has weight 160 pounds and is 5 ft 3 inch tall - the BMI is going to be 28.34 after the calculator is used (Overweight body according the reference table).

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