Here is the
Wedding Cake Cutting Guide from the cake pan manufacturer Wilton Industries. It also shows the pans sizes for the different shapes of pans (i.e. 8", 10", 12", 14" and so on).
This guide shows how to cut popular shaped wedding tiers into pieces approximately 1 in. x 2 in. by two layers high (about 4 in.). Even if a larger serving size is desired, the order of cutting is still the same. The first step in cutting is to remove the top tier, and then begin the cutting with the 2nd tier followed by the 3rd, 4th and so on. The top tier is usually saved for the first anniversary, so it is not calculated into the serving amount.
I always tell brides not to worry about cutting the cake because that is what you are paying the reception site for!Round Tiers:
Move in two inches from the tier's outer edge; cut a circle and then slice 1 in. pieces within the circle. Now move in another 2 in., cut another circle, slice 1 in. pieces and so on until the tier is completely cut. The center core of each tier and the small top tier can be cut into 3rds, 4ths, and 6ths, depending on size.
Square Tiers:
Move in 2 in. from the outer edge and cut across. Then slice 1 in. pieces of cake. Now move in another 2 in. and slice again until the entire tier is cut.
Heart Tiers:
Divide the tiers vertically into 1/2ths, 4ths, 6ths and 8ths. Within rows, slice 1 in. pieces of cake.
Hexagon Tiers:
Move in 2 in. from the outer edge and cut across. Then slice 1 in. pieces of cake. Now move in another 2 in. and slice again until the entire tier is cut.
Oval Tiers:Move in 2 in. from the outer edge and cut across. Then slice 1 in. pieces of cake. Now move in another 2 in. and slice again until the entire tier is cut.