Quote:
Originally Posted by **prterrell**

Surface area of a 1"x2" slice of cake is 2.

Surface area of a round cake is radius squared times pie.

The radius = 1/2 of the diameter, which is the size of the round.

Pie = 3.14

To square a number means to multiply it by itself

So, for the 8" round cake, the surface area is (4x4)x3.14 = 16x3.14 = 50.24

Divide the surface area of the cake by the surface area of the slice

50.24 divided by 2 = 25.12

So, an 8" round cake gives 25 servings. I *think* the charts say 24 just to be on the safe side.

i always figured out the slice i wanted 1" x 2" x 4" = 8 cubic inches.

then take your cake, we'll take an 8" cake for instance

take the length x width x height (for round cakes use 1" less for height to account for the lost corners)

8" x 8" x 3"'=192 divide that by the cubic inches of your slice (8")

192 divided by 8=24

if it's a square cake use the full 4" height.

this way if you wanted to serve a bigger slice of cake, it's easy to figure out servings too........such as a 1"x3"x4" slice would be 12 cubic inches

192 divided by 12 =16 servings for an 8" round