For example, if Xiao Li's height is 165cm and weight is 55kg, then Xiao Li's BMI is 55/(1.65 *1.65) = 20.2, which is a healthy weight. The comparison table is as shown in the figure:

BMI is the body mass index, also known as body mass index or body mass index. It is a commonly used international standard to measure the degree of human fatness and thinness. It can be used to reflect the density of human body to some extent, and can also be used as a reference for reducing fat, which is suitable for the general population.

The body mass index of Chinese adults is generally18.5 ~ 23.9, which is normal. However, for people with a particularly high muscle ratio, pregnant women and other special people, the reference significance of this calculation result is not very great. Even if their BMI exceeds 30, they don't actually need to lose fat.

Because of the different operation, the obtained data will also be different, or external factors will also lead to the difference of values. It is recommended to measure for many times and take the average value as the reference value.

In addition, when calculating the formula, we must pay attention to the formula unit, the weight is kilograms (kg), the height is meters (m), and it is the square of height.