About BMI Chart Categories:
Body mass index (BMI) is a statistical (mathematical) measure of the weight of a
person scaled according to height. It was invented between 1830 and 1850 by Belgian
Adolphe Quetelet during the course of developing "social physics".
Body mass index is defined as an individual's body weight divided by the square
of their height. The formula is universally used, but alone, it is not an accurate
measure of health.
What Do the Results Mean for Adults?
For adults age 20 and older, the BMI calculator results are interpreted using standard
weight status categories that are the same for all ages and for both men and women.
The standard weight status categories associated with BMI ranges for adults are
shown in the following table:
>=30.0

Obese

25.0 – 29.9

Overweight

18.5 – 24.9

Normal Weight

<18.5

Underweight

BMI Formula
BMI = Weight(kg)/(Height(cm)*Height(cm))
Health Risk Related to a High BMI
The reason the BMI is used for screening the health of the general population is
due to the strong correlation between being overweight or obese and having health
problems, chronic disease and premature death. People who are overweight or obese
have an increased risk for the following health conditions:
 Hypertension
 Type 2 diabetes
 Coronary heart disease
 Stroke
 Osteoarthritis
 Some cancers
 Sleep apnea and respiratory problems