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Body Mass Index (BMI) formulas

Body Mass Index is a calculation that takes into consideration both a person's body weight and height to determine whether they are underweight, overweight, or at a healthy weight. It can be calculated in inches and pounds (in the United States), or meters and kilograms (in countries that use the metric system).

In inches, the formula looks like this:







[
weight in pounds
(height in inches) x (height in inches)
]
x 703

A person who weighs 180 pounds and is 5 feet 8 inches tall has a BMI of 27.4.
[
180 lbs
(68 inches) x (68 inches)
]
x 703 = 27.4

In meters, the formula looks like this:
[
weight in kilograms
(height in meters) x (height in meters)
]

A person who weighs 99.79 kilograms and is 1.905 meters (190.50 centimeters) tall has a BMI of 27.5.
[
99.79 Kg
(1.905 m) x (1.905 m)
]
= 27.5


BMI Categories:

  • Underweight = <18.5
  • Normal weight = 18.5-24.9
  • Overweight = 25-29.9
  • Obesity = BMI of 30 or greater
Source: HowStuffWorks.com
Tags: Health BMI Body Mass Index

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