If you only do one layer, I'd make two cakes.
This might help:
http://www.wilton.com/wedding/cakeinfo/partycuttingguide.cfm
I'm going to throw a little reality in here... I cut an 11"x15" into 40 pieces. (8 slices long by 5 slices wide) for reasonable servings. You can reasonably go 8 by 6 rows, but anything under that and your guests are getting one bite of cake. If that's how you want it (very common at weddings) then 2 sheets will work perfectly. I just know that at many weddings I have been to, people get cranky if you don't give them a decent piece of cake. (Unless the cake is nasty, and I am guessing yours is TOTALLY AWESOME!!)
Here are some previous threads:
http://www.cakecentral.com/cake-decorating-ftopict-10331-11x15x2.html
http://www.cakecentral.com/cake-decorating-ftopict-4617-11x15x2.html
http://www.cakecentral.com/cake-decorating-ftopict-3704-11x15x2.html
http://www.cakecentral.com/cake-decorating-ftopict-45317-11x15x2.html
It seems to me that in considering serving sizes, it makes a difference if:
torting and filling (a single layer)
torting and filling stacked layers
using the Wilton wedding/party cutting guide
There doesn't seem to be a CC standard for sheet cakes.....
I do like Zmama's serving guide - it's more realistic for party planning:
www.pastrywiz.com/cakes/servings.htm
(However, on the sheet cakes, it's about the same as Wilton's.)
So then the issue comes to "price" - since there are now less servings per cake?
I agree. I always get 3 rows of 12 slices so 36 servings from my 11x15 pan and I make a 2 layer cake. Mind you I like my serving size to be much larger than what is noted by Wilton. Who only eats a 2"x2" piece of cake?!?!
My reply was not super helpful. Wedding cake slices, Wilton says that pan will feed 60 (so about dbl what I get out of the pan).
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