Sorry to ask this but for some reason the search is not working for the forums! I need a sheet cake for 40 people. It will have filling. Would a 11x15 pan be enough servings? I want there to be enough cake but not too much! Thanks in advance for the help!!
11 x 15 pan should be more than enough... if you cut your pieces into approximatly 2" x 1.5" pieces your looking at about 50 - 55 servings.
Standard servings size for a single layer sheet is 2x2x2. An 11x15 serves 35 (7 rows by 5 columns). A 12x18 serves 54 (6 rows by 9 columns).
The nice thing about sheet cakes is you are able to just do-the-math, based on the size of the piece of cake, to figure how big of a cake you'll need.
Thank you both so much! I think I will stick to the 11x15 and make some cupcakes to go with it just incase. That way if there are people who don't like the filling they can just have a cupcake instead!