In terms of economic principles, the standards of the middle class are complicated, and the standards for dividing the middle class vary from country to country. The standard for the middle class in new york is 100 W, that for Malaysia is 1w and that for South Korea is 2 W. It is an indisputable fact that China's assets are mainly concentrated in the hands of a few families, but the internationally recognized standard for the middle class in China is probably the top 20% of the families in China. There is also Engel's coefficient method (food expenditure as a percentage of household income). If the Engel coefficient of your family is below 30%, your family can also be classified as middle class.
In fact, the criteria for dividing the middle class are very complicated, and even the National Bureau of Statistics can't count the exact figures, but I am talking about the criteria for dividing the middle class with reference to general economic principles. Although this standard is not necessarily accurate, it is objective to some extent.