What is the height of an average sheet cake?? I made one this weekend. I took 2 1/2 sheet pans and filled them with one box of cake mix. I thought the cake could be a little higher? What does anyone reccommend? I didn't want the cake to spill over so I only used the one box. Let me know what you all think. 
what size are the pans??? I used two mixes for a 12" x 18" x 2" pan and it was perfect.......not too much of a dome on top (because of my flower nail) and then what cake there was sticking up...I put my cooling rack on top and pushed it down for a min. and it made the whole thing perfectly level. The two mixes were perfect!!!!
In my 12*18*2 pans I use 3 cake mixes and they are nice and tall and do not bake over the edges at all.
mine didn't bake over the edge at all!! I used two mixes because I wanted two separate flavors in the cake and didn't want to mess around with covering a separation line by joining two separate cakes together.......yes the nail works beautifully......I just nestled it down in the batter after the pan was full! It took only 40 min. to bake and came out perfectlly. Good Luck
I don't know the average height of those, but I do know that mine are always alot thicker then the ones I see in the store bakeries! 
I have the 12x18 also and I use 3 boxes in that one, it's never baked over the edge. I do have to level it a little more then KHalstead said she has to, but it's never baked over, and it comes out a nice size. 
Ok, this is embarrasing, but I have to know lol ceculsk, what's an extender for that? 
I haven't been at this stuff very long, still alot I have to learn I guess 
I generally use 2 box mixes for a 9X13, and 3 box mixes for a 11X15. It raises just a little over the pan but not too much (no spill over) but enough for me to get a nice level cut all the way across and it gives me a full 2 inches of height.
Ohhh, OK, that makes sense!! Now I really feel like an idiot LOL! Thanks for the info 
Cakes should be 2 inches high baked. To get this you should fill the pans 2/3 rds full. A 12 x 18 pan holds 3 mixes and 1 extender. a 1/2 sheet or 12x16 holds 2 cake mixes and 1 extender.
I agree with ceculsk!! I would totally recommend the cake mix extender as it's a little denser but WAY easier to work with!!! You will also use less cake mixes and with the flower nails it'll bake super even!!! If your putting 2 cakes side by side, don't push the cake down once baked they wont be even. You'll need to level them off!!! Good luck!
Just one pan is all you need. Unless your goal is something even thicker
so when you add the 2 or 3 boxes in the 12x18 pan. You only bake one pan or 2?
Yes, put it all in the one pan and bake away!!! It should'nt overflow especially if you use 2 flower nails. If your worried, put a cookie sheet underneath the cake while baking for just in case!!
Bodaisy,
I too want to bake a 12x18 and want to use the extender recipe. Would I use 2 boxes or 3 if I want a full but dense cake? Please advise.
Bodaisy,
I too want to bake a 12x18 and want to use the extender recipe. Would I use 2 boxes or 3 if I want a full but dense cake? Please advise.
Do 2 extenders and 2 cake mixes for the 12 x 18 pan because it holds 3 regular mixes. Good Luck!! Your talking a 2inch deep pan correct?? I have a 3 inch pan so I have to use a little more.
Thanks for the great advice, I will do that for my Easter cake.
I use 1 1/2 cake mixes per 12x18.
Also wrapped with damp towel strips so that you don't have to wrry about that dome. Usually takes close to an hour on 350 to bake.
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