I'm doing a chocolate chake with chocolate icing for a 30th birthday this weekend. There will be around 20 guest. I just dont no what size to make for 20 people. One website says that a 9x13 would feed 25-30 people. That just dont seem big enough to me. Is that correct? Any suggestions?
Thanks for any help

9x13 will feed your 20 people and then some.It is big enough!

9" x 13" is 117 square inches... with say a 2" deep pan. If you were to divide it by 25 guests evenly, each would get 4.68 sq inches of cake... which would be roughly 2.15" x 2.15" inch pieces at 2 inches deep.

For 30 it would be 3.90 sq inches per person... meaning sizes of 2 x 2 at 2" deep.

Get a piece of paper out and measure 2" x 2". If you are happy with that size... and believe that no one extra will show up NOR want extra... then 9x13 is fine.

I like to have extra... I'd go with a half sheet... something like 14 x 20.
That is 2 x 2 with left overs or 3 x 3 for each guest.

Sorry I just realized you said only 20 people and a 9 x 13 feeds 25 to 30.

Ill do the math for that too. At 20 guest that is about 2.4" x 2.4" by 2 inch deep.

A 9x13 that is 4" high is a lot of cake. If the only thing you're serving is cake and you've got really hungry guests, then you might want more, but otherwise you should be fine.

Thank You so much for all of your help. I'm just one of those people that is always afraid of not having enough. You all have put me at easy.
Thanks again and have a wonderful day.
Wendy