According to the query of Baidu encyclopedia, 9 cups of paper cups is a common size of paper cups, which has a certain height, caliber and bottom caliber, which is usually 8.7cm high, 7.5cm top caliber, 5.3cm bottom caliber.Usually used for catering, conferences and other places. The capacity of these cups is 9 ounces, which is equivalent to between 250 ml and 300 ml. These paper cups can hold drinks, tea, coffee and other liquids, convenient, clean and hygienic.