I've heard that it's about 2 mixes, but I have to make it tonight and I'm a little worried that 2 mixes won't be enough. Need to know so I can send my husband to the store on his way home if need be!

TIA!

3. The 11x15 uses 2 mixes.

Thank you! I thought 2 sounded a little low, because I use 2 for a nice thick 9x13, and I don't want to end up with an inch thick cake!!!

I would say 3 mixes per 12x18x2, if you're not extending or doctoring them.

Here's a handy chart (uses DH mixes):

http://forum.cakecentral.com/cake-decorating-ftopict-22705-.html
(ozzynjojo's post)

If you use the doctored White Almond Sour Cream cake recipe - 2 boxes would be enough:

http://forum.cakecentral.com/cake-decorating-ftopict-22705-.html

http://tinyurl.com/2cu8s4
(More flavor variations.)

HTH

If you look in the pan their are two lines, one for a single layer cake or a double layer.

Single layer - two cake mixes.

double layer - four cake mixes

Hmm...I'll have to look in mine for those lines. I never noticed that before.

But I just wanted to give a second vote for what justsweet just said! That is how I do it.

Oh oops - for one solid sheet cake (no torting or layers), I use 3 mixes.

But if I am going to layer it, I use 2 mixes per layer to make 2 thinner layers. I would rather bake twice than have to torte something that large.

Ok, look at my pan. I was wrong it is a wilton professional pan

12x18x3 and their is a line for the cake mix. The line is for a double layer.

i use 2 with the cake mix extender

I just took one out of the oven. I used 2 mixes with an extender. It rose all the way to the top of a 12x18x2.