This is the figure obtained by dividing the weight and kilograms by the square of the height and meters. It is a widely used international standard to measure the degree of obesity and health. Mainly used for statistics, when it is necessary to compare and analyze the health effects of a person's weight on people of different heights, the body mass index value is a neutral and reliable indicator. It is a test item stipulated in the National Students' Physical Health Standard.
The normal range of adult body fat rate is 20% ~ 25% for women and 15% ~ 18% for men. If the body fat rate is too high and the weight exceeds 20% of the normal value, it can be regarded as obesity. The body fat rate of athletes can be determined according to sports events. The average of male athletes is 7% ~ 15%, and the average of female athletes is 12%-25%.