BMI (Body Mass Index, also known as body mass index, English as body Mass index, referred to as BMI), is a number obtained by dividing the weight of kilograms by the square of the height of meters, is currently commonly used in the world to measure the degree of body fat and health of a standard. Mainly used for statistical purposes, BMI is a neutral and reliable indicator when we need to compare and analyze the health effects of a persons weight on people of different heights.