Cake sizes

Cake size Approximate servings based on portion size
Inches Coffee Dessert
6 25 10
7 35 12
8 45 15
9 55 20
10 70 25
11 85 35
12 100 40

Portions:

Dessert size:  1 x 2 x 3 inches (high)  or  2.5 x 5 x 8 cm ( high)

Coffee size: about half a dessert size portion.