I was asked to make a baby shower cake for my friend and she needs it to feed 30-35 people. When I looked on the Wilton site it looked like a half sheet cake would feed 60. I'm not 100% sure because I just counted the squares for the cutting guide. So my question is will a half sheet cake be enough or should I make a full sheet cake.
I also want to know if I put 2- 9 x 13 cakes side by side would that be the same as a full sheet cake. I really don't want to purchase a full sheet cake pan because I am only baking cakes for family and friends.
Thanks,
Dawn
History of cake pan sizes:
A commercial baking sheet pan is 18x26 (or sometimes 18x24)...full sheet.
Cut that in half and you now have two 12x18's.....half sheet.
Cut those in half and you now have four 12x9's....quarter sheet.
I think Wilton threw the 11x15 in there just to screw us up! 
Here is a link to a thread where I explain how to "do the math" to figure how many servings you get for each size cake, based on single layer cakes: http://cakecentral.com/cake-decorating-ftopict-650914-math.html
easy.
determine size of cut
so if using 2x2x2 (wide x length x height)
divide one side of cake measure by width
the other side by length
and multiply the answers together
9 / 2 = 4.5 = 4 (drop the fraction)
13 / 2 = 6.4 = 6 (drop the fraction
4 * 6 = 24 servings for 1 9x13
two of them would yield double that --> 48 -- way more than you need.
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example two.
if you switch to 1.5x2x2 servings it goes like this:
9 / 1.5 = 6
13 / 2 = 6.5 = 6
6 * 6 = 36 exactly what you need -- tho' the servings are a bit smaller.
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yes, it's math, but fairly simple and it works for any size square or rectangular cake
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