The choice of birthday size actually depends on the occasion and the number of people. If there are two people, it should be six inches. If many people spend time together at home, it will be delicious and there is no need to play around.
Five or six people, eight inches is enough. If it's eight or nine people, 12 inch is about the same. If there are many people, just increase the scale appropriately. Birthday cakes generally don't need to be too big. Just eat one piece. Too much will make you tired.
If it's a party with friends, you need to book a bigger one, otherwise it's not enough. So for five or six people, you need to book 10 inch or more. By analogy, seven or eight people had better book a 12-inch one. Booking for more than ten people 14 inch or more.
Cake size comparison chart
6 inches = 15.24cm≈ 1 lb: suitable for about 2-4 people, suitable for birthday parties, Valentine's Day, Mother's Day and other festivals.
8 inches =20.32cm≈2 kg: 4-6 people eat, suitable for birthday parties, various festivals, visiting relatives and friends.
10 inch = 25.4cm ≈ 3kg: 6- 10 person, suitable for birthday parties, various festivals, visiting relatives and friends.
12 inch = 30.48cm ≈ 4kg: 10- 12 people, suitable for birthday parties, various festivals, visiting relatives and friends.
14 inch = 35.56cm ≈ 5kg: 12- 14 people, suitable for company and classmate gatherings.
16 inch = 40.64cm ≈ 6kg: 14- 16 people, suitable for all kinds of medium-sized celebrations.