First we need to know what Body Mass Index is:What is BMI?The body mass index or BMI is a ratio of mass to height. It is calculated as kg per square meter or pounds per square inch of height. Numeric BMI values correspond to weight categories including underweight, normal, overweight and obese.BMI is used as an indicator of the relative healthiness of a person. The Centers for Disease Control (CDC) and the World Health Organization (WHO) recognize that people who are overweight or underweight are at higher risk for certain health conditions. BMI also enables health professionals to discuss bodyweight objectively with their patients.Calculate Adult BMIThe CDC and WHO use the BMI range charts below to evaluate the weight of adults aged 20 and over given his or her height. These ranges typically apply to North American and Eurpoean populations. Wikipedia lists alternative BMI ranges and categories for specific Asian populations. Cut-off
source:internet points for specific international subpopulations may vary.