How Many Cups of Frosting Do I Need to Frost a Layer Cake?
To frost the top, sides, and between the layers of your cake, you'll probably need more frosting than you think. Read on to find out how much frosting you need for each size of layer cake.
Frost a Layer Cake
It takes about 2½ to 3 cups of icing to generously fill and frost a two-layer 9-inch cake. For a three-layer cake, plan on using 3½ to 4 cups.