How Much Do You Need?

The amount of frosting you need varies based on the following factors:

 Icing 

Glaze -- spread, drizzle or pour:

Cake Size Top Only Top & Sides Top, Sides & Filling Cake Size Top Only
 
8 " 2-layer   1-1/2 cups 2 cups 9" or 10" cake 1 cup
9" 2-layer   2 cups 2-1/2 cups 10" x 15" sheet cake 1-1/3 cups
9" 3-layer   2-1/2 to 3 cups 3-1/2 to 4 cups    
8" square 3/4 cup 1-1/2 cups      
13" x 9" 2 cups 2-1/2 cups      
9 or 10" tube   3 to 4 cups      
9" x 5" x 3" loaf 1 cup        
12 cupcakes 3/4 to 1 cup