Ok, first I'm warning that I'm not the best at math, so i might be off on my figures. I posted a question last nite about needing a sheet cake to feed approx. 100 for Sunday at church. In the past, they've let me do what I want creatively, but this time they need the ease of a sheet cake.
Here's my problem, and indydebi helped shed some light on my other post, but now I've done the math and 
I'm annoyed.
According to Wilton, a 9x13 double layer, filled sheet serves 45
a 12x18 double layer filled serves 72
I need approx. 100 - they said they could cut small and not sure how many people would actually want cake.
So, two 9x13s would put me in the ballpark. Right? Wrong!!
I got to wondering how a 13x18 would get me 90 when a 12x18 gives 72.
Well, it doesn't - here's the math for party sized slices, 1.5x2":
1 9x13 = 6.5x6 = 39 (how did they get 45?)
1 18x13 = 9x8.6= 77
That's THIRTEEN less servings!!
I guess it's my fault for not doing the math, but I really don't like math, and you would think that you could trust Wilton's sizes!
Grrr! Thanks for listening! I'm glad I did the math before I baked!
I dont' like Wilton's chart either. Indydebi has a really great serving chart that I use all the time. It's got different numbers for party, wedding, and family size slices. I always price by the wedding slices. Ifyou do a search for Indydebi and serving chart, it will probably pop up.
As for me, when I need 100 servings, I made 2 12x18 put together.
I don't know if this will make it easier or not. If you figure the square inches of the 12 x 18 it is 216. The square inches of a party slice (1.5 x 2) is 3. Divide 216 by 3 to get 72. HTH
Yes, this is a much easier way of looking at it - did i mention I don't like math? 
Thank God for Excel!
This is for cake & coffee after Confirmation Sunday around 2:00. There are 20 kids getting Confirmed and then parents, siblings,etc. and the Bishop, Priest, Altar Servers. I think two 12x18s might be too much? I guess better too much than too little though.
Sheet cakes make me nervous to begin with - that's alot of white space!! 
A 12 x 18 single layer cut into 2x2x2" squares is 48 servings (12/2 =6 18/2 =9, 6x9=4
Put a second layer on top, and cut it into 1x2x4" slices and it feeds 96
That's the way I've always cut it.
I figure single layers as 2x2x2 servings and doubles as 1x2x4 like you do, but with a 12x18 I get that 6x9 = 54 so then a double layer would equal 108
, 
Quote by @%username% on %date%
%body%