10 inch cake is suitable for 7- 10 people, and is suitable for family or friends' birthday parties. However, it depends on the way you cut the cake. If the demand for cake is not great, you can cut it smaller and give it to more people when you cut it.
Common cake sizes:
6 inches: 2-3 people eat, suitable for birthday parties, Valentine's Day, Mother's Day and other festivals.
8 inches: 3-5 people eat, suitable for birthday parties, various festivals, visiting relatives and friends.
10 inch: 5-8 people eat, suitable for birthday parties, various festivals, visiting relatives and friends.
12 inch: 8- 10 people, suitable for birthday parties, various festivals, visiting relatives and friends.
14 inch: 10- 12 people eat, suitable for company and classmate gatherings.
16 inch: 12 people or more, suitable for all kinds of medium-sized celebrations.