Sheet cakes (single layers):
1/4 9 x 13 feeds 15 - 20
1/3 11 x 15 feeds up to 35
1/2 12 x 18 feeds up to 50
full 24 x 36 feeds up to 100
HTH
I personally think it would depend on if you are going to do single layer or double layer sheet cakes. When I do single layer sheet cakes I divide the cake into 36 pieces (2x3 in pieces).. they are a nice servings.. if you are going a double sheet cake than I just cut them into the "standard" wedding serving of 1x2x4 (I think I'm remembering that right)...and it would also depend on if there is going to be a "main" or typical wedding cake that is going to be cut and served. HTH.
For a wedding I would definitely make them double layer and make two 12x18's for 200 servings and one 11x15 for 75 servings.
full 24 x 36 feeds up to 100
HTH
You mean a 18x24. A 24x36 would be four 12x18's and would serve 200. I think you doubled both numbers instead of just doubling one of them.
HA HA HA - Of course you are right indydebi, I googled the info and pulled this off a website, I'll have to go check who's, this was just copy & pasted. GREAT CATCH 
Quote by @%username% on %date%
%body%