Index, body mass (BMI): An index that relates body weight to height. The body mass index (BMI) is obtained by dividing a person's weight in kilograms (kg) by their height in meters (m) squared.
The National Institutes of Health (NIH) now defines normal weight, overweight, and obesity according to the BMI rather than the traditional height/weight charts. Since the BMI describes the body weight relative to height, it correlates strongly (in adults) with the total body fat content.
Overweight is a BMI of 27.3 % or more for women and 27.8 % or more for men, according to the NIH.
Obesity is a BMI of 30 and above, according to the NIH. A BMI of 30 is about 30 pounds overweight. Some very muscular people may have a high BMI without undue health risks.
Calculate Your Body Mass Index. Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.
Calculate your Body Mass Index (with this friendly BMI calculator) and compare yourself to other women or men of the same age and height.
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Body Mass Index (BMI) is a number calculated from a person's weight and height. BMI provides a reliable indicator of body fatness for most people ...
WebMD tells you how to use body mass index or BMI to determine if you are overweight.