I am doing an 11x15x2 sheet cake this weekend. They need it to feed around 50-100 people. Will one do it or should I bake a second? Thanks.

If you only do one layer, I'd make two cakes.

This might help:

http://www.wilton.com/wedding/cakeinfo/partycuttingguide.cfm

I would bake a second cake.

ditto, i've always been told an 11x15 feeds 35

if you cut the slices 1 by 2 inces...you will get 82 slices from one cake...so 2 would more than feed the 100 people.

I'm going to throw a little reality in here... I cut an 11"x15" into 40 pieces. (8 slices long by 5 slices wide) for reasonable servings. You can reasonably go 8 by 6 rows, but anything under that and your guests are getting one bite of cake. If that's how you want it (very common at weddings) then 2 sheets will work perfectly. I just know that at many weddings I have been to, people get cranky if you don't give them a decent piece of cake. (Unless the cake is nasty, and I am guessing yours is TOTALLY AWESOME!!)

I agree. For only 2 inches tall, a 1x2 piece won't work. If you cut it 8x5, and get 40, you need 3 cakes.

You could make a really tall cake and stack the two 11x15's. Then you could cut small slices and still get lots o'cake and you'll have less decorating to do!

I agree with baaking a second.

Here are some previous threads:

http://www.cakecentral.com/cake-decorating-ftopict-10331-11x15x2.html

http://www.cakecentral.com/cake-decorating-ftopict-4617-11x15x2.html

http://www.cakecentral.com/cake-decorating-ftopict-3704-11x15x2.html

http://www.cakecentral.com/cake-decorating-ftopict-45317-11x15x2.html

It seems to me that in considering serving sizes, it makes a difference if:

torting and filling (a single layer)

torting and filling stacked layers

using the Wilton wedding/party cutting guide

There doesn't seem to be a CC standard for sheet cakes.....

I do like Zmama's serving guide - it's more realistic for party planning:

www.pastrywiz.com/cakes/servings.htm

(However, on the sheet cakes, it's about the same as Wilton's.)

So then the issue comes to "price" - since there are now less servings per cake?

two would do i think

I suggest going with three. I don't think two would be enough.

I agree.  I always get 3 rows of 12 slices so 36 servings from my 11x15 pan and I make a 2 layer cake. Mind you I like my serving size to be much larger than what is noted by Wilton.  Who only eats a 2"x2" piece of cake?!?! 

My reply was not super helpful. Wedding cake slices, Wilton says that pan will feed 60 (so about dbl what I get out of the pan).