The inch here refers to inch, because one inch = 2.54 cm.
That is, the diameter of 6-inch pizza is 6*2.54= 15.24 cm, which is enough for about 2 people. The diameter of a 9-inch pizza is 9*2.54=22.86 cm, which is enough for 3-4 people. , 12 inch =30.48 cm, 14 inch =35.56 cm. And so on.
Classify by size
A.9-inch pizza, recommended 1-2 people.
B. 12 inch pizza, recommended for 2-3 people.
C14 inch and above pizza, recommended for 3-4 people or more.
Classification by cake bottom
A. Pan Pizza
B Hand-tossed Style Pizza
Reference to the above content: Baidu Encyclopedia-Pizza