I'm getting myself confused. I have a sheet cake order for 100 servings. Do I buy the right size pan and have a single layer or a pan size and stack them. (or put two cakes side by side) Also, do I use 2" high pans or 3" high ?
Actually, I have 2 of these to make for the same party. Will I need to buy 4 identical sized pans.
So, I need two cakes...100 servings each.
Thank you sooo much in advance!
Shelly
Unless you have a REALLY big oven, you'll need to make to half sheets and put them side by side. A full sized pan would be extremely difficult to handle and to get to bake evenly without a commercial oven.
Don't forget to make your cake board very sturdy so that it doesn't bend in the middle when the cake is lifted.
Michele
Okay, so I'll make things easy for you. I call all of my rectangular pans sheet pans. Not half or quarter! That confuses the bejeezus out of me since everyone has a different opinion as to what constitutes a "sheet cake"!
What I know is a 12x18" Wilton sheet pan will feed up to 72 (seems like that number went down in their year book 
) anyway this is for a two inch deep pan.
A 11x15" Wilton sheet pan will feed up to 60 people! What you can do is make two 11x15" single layer cakes and put them side by side on a sheet of plywood. I use plywood as it is the sturdiest! I bought a sheet of plywood from Home Depot for $26.00 a year or so ago and had them cut it into various sizes!!! Anyway, just bake two 11x15" cakes and put them side by side. You can serve up to 120 people or right at 100 if slices of cake are bigger than the typical 1x2"!
I hope I didn't confuse the heck out of ya!!! 
Amy
I was asked to do a "sheet" cake a few months ago. I was at a loss! I made (2) 9 x 13" - my lasagna pan - and put them together. I put icing between the two and no one knew the difference! I finally did buy a 12 x 18 x 2" pan and it life much easier.
The most important thing as mentioned - sturdy cake board!!
k here's the lowdown on sheet cake sizes;
first you have your quarter sheet which is the typical 9x13 pan readily available in most grocery and general merchandise stores. Then you have your half sheet which (here is comes) is the confusing size as there are two generally held opinions as to whether it's 11x15 or 12x18. Both are considered "half sheets". Now, no one except the "big boys" (bakeries or restaurants) has the ovens big enough for "full sheets". So here's how us normal people do this (if ya'll could call us normal LOL) You take two "half sheets" and put them together long sides to make a "full sheet cake. Make sure you use lots of "glue" (frosting) to hold them together down the seam. Then frost n decorate as usual. The ply-wood idea is wonderful. Just remember that your cakes will weigh like a ton (at least you'll think they do) You might want to get some guy (promise him a cookie or something) to carry that for ya to the venue.
Thanks for the help! That was so helpful. Two more question. If I either use two 12 x 18 or 11 x 15 together side by side using a 2" pan single layer, is it normal for it to end up very short or are they torted and filled for height?
Do most of you use a 2" or 3" height when baking sheet cakes?
You could torte them and fill them or you can just stack them. They will be huge cakes though, and you might just want a single layer as that would feed 90-96 peeps if you slice it 2x2. You would get double that if you stacked them. You would then slice em 1x2. Most sheet cake pans are 2" by default.
They shouldn't be thin at all! All of my sheet cakes I fill and they aren't thin at all! You should be fine putting them side by side. If you fill your pans enough you should have a 2" thick cake. Filling it isn't going to add that much height to it!
I call my 9x13 a quarter sheet, my 11x15 a 1/3 sheet, and my 12x18 a half sheet. I also cut them differently than Wilton recommends. My husband has a fit about getting a piece of cake vs. a taste of cake. My 1/4 serves 18 (cut 3 pcs on the short side and 6 pcs on the long side). The 1/3 serves 42 (cut 6 x 7) and the 1/2 serves 48 (cut 6x
. I fill all of my pans about 3/4 full so they rise just above the top so I can trim them and get a nice 2" tall cake.
I have put two half sheets together to make a full sheet, but I can't carry it with out help, so I really encourage people to go with 2 halves instead. Besides, that's really huge!
As an example, I have an order this weekend for "approx 200" people, so I will be making 4 half sheets for a total of 192 pcs.
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