measurement help! Its for a 60th birthday party. (at least 50 rsvped). I am making two of a 18x12x2 sheet pan, and planning on layering them. 1st, is that going to be enough? I have no idea how to figure that stuff out. 2nd, I am using box mix (because I haven't found a homemade mix that I like as much) anyway I am combining 2 or 3 boxes per pan. Is that to much, or is that fine???

One last thing I am working with fondant, and need to know how much I will need to cover the cake....

Please help!

You have 108 servings, so yes that's enough.

http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm

I don't know anything about box mixes as I don't use them.

How much fondant
http://www.wilton.com/decorating/fondant/fondant-coverage-chart.cfm

You googled?

Yes I did google. However I wanted a second opinion from experts! Thanks! That was very helpful!

I'd assume two layers, but I always have extra fondant on hand.

For the pans, you really need to calculate volume and compare it to the amount that your box mix makes.

That said, an 11x15x2 holds two Duncan Hines butter mixes exactly. By my estimates you'd need 3 mixes.

11x15x2 = 165 cubic inches 82 cubic inches per cake

12x18x2 = 216 cubic inches 51 cubic inches bigger ~ 2/3 of the third cake mix.

I use 2 betty crocker cake mixes for the 11x15.
I use 3 betty crocker cake mixes for the 12x18.

Leah is right on the servings. You'll have plenty.