What is BMI?

BMI stands for Body Mass Index. Body mass index is a value derived from the mass and height of a person. The BMI is defined as the body mass in kilograms divided by the square of the body height in meters, and is expressed in units of kg/m².A BMI of less than 18.5 means that a person is underweight. A BMI of between 18.5 and 24.9 is ideal. A BMI of between 25 and 29.9 is overweight. A BMI over 30 indicates obesity.