hi all,
i'm a newbie. i plan to make a wedding cake in june and want to have sheet cakes in the back kitchen to serve in addition to the display cake (250 servings).
how large is a sheet cake? what are the pan sizes? and number of servings? i can't seem to find serving charts except for square cakes. are squares and sheets the same thing?
Thanks 
With square or rectangle cakes, it's easy to just do the math to figure your servings.....
Single layer:
11x15 cake: 2x2" servings = cut columns/rows of 5x7 = 35 servings
11x15 cake: 2x3" servings = cut columns/rows of 5x5 = 25 servings
12x18 cake: 2x2" servings = cut columns/rows of 6x9 = 54 servings
12x18 cake: 2x3" servings = cut columns/rows of 6x6 = 36 servings
These are based on a single layer cake. If you bake two layers, then you will probably cut the pieces into 1x2" pieces to yield different serving amounts.
Double layer (pieces are 4 tall same as a wedding cake):
11x15 cake: 1x2 pieces = cut columns/rows of approx 10 x 7 = 70 servings
12x18 cake: 1x2 pieces = cut columns/rows of approx 12x 9 = 108 servings
Just do the math.....!
Here are all four Wilton baking/serving charts:
http://www.wilton.com/cake/cakeprep/baking/times/index.cfm
(Sheet cakes are found under 2" and 3" party charts.)
Multi-linked thread on sheet cakes and serving sizes:
http://forum.cakecentral.com/cake-decorating-ftopict-81011-.html
HTH
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