The Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women. BMI is defined as the individual's body weight in kilograms divided by the square of their height in meters.

BMI Categories:

Underweight = <18.5
Normal weight = 18.5-24.9
Overweight = 25-29.9
Obesity Class 1 = 30-34.9
Obesity Class 2 = 35-39.9
Obesity Class 3 = > 40.0