BMI Calculation: An Overview
Researchers studying obesity have determined that a person's level of body fat can be measured using a simple calculation known as
body mass index (
BMI). While BMI is an indirect measure of body fat, it does correlate closely to direct measures of body fat in most people.
The only measurements needed to calculate BMI are a person's height and weight. Because the BMI calculation only requires these two measurements, it is an inexpensive and easy way for healthcare providers and the general public to use as a method of screening for weight categories that may lead to health problems
(see Health Effects of Obesity).
BMI Calculation: Specifics
BMI calculation is done the same way for both adults and children. The formula used for BMI calculation differs somewhat, depending on whether you are using the metric system or the English system.
Metric System
If you're using the metric system, the BMI formula is:
Weight in kilograms divided by height in meters squared (weight (kg) / [height (m)2]).
Since height is commonly measured in centimeters, divide height in centimeters by 100 to obtain height in meters before you use the formula.
To calculate BMI, take the weight (kg) and divide it by height (m). Then divide that number once again by height (m). Round to the second decimal place.
An example of BMI calculation: Height = 165 cm (1.65 m), Weight = 68 kg
BMI Calculation: 68 ÷ (1.65)2 = 24.98
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