To calculate how many servings your sheet cake will hold, two separate equations will be necessary. First, multiply the length by the width of each slice. For instance, a slice of single-layer sheet cake is roughly 3 x 3 inches, which comes out to 9.
Lastly, divide the area of your pan by the area of each slice, which in this example would be 234 divided by 9, which comes out to 26 servings of cake.
If you end up with a decimal number, round down to the nearest whole number. Additionally, consider the height of the cake; thicker cakes allow for smaller slices.
Single-layer sheet cakes will be cut into roughly 3 x 3-inch slices, while thicker sheet cakes will be cut around 2 x 2 inches.
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