I do all the cakes for a local indoor party place and they usually order 1/4 sheets. This week they ordered a 1/2 sheet. Since they are customers I make cakes for everyweek, I only charge them $20 for the 1/4 sheet. I have never done a 1/2 sheet and it isn't requested much so I have no idea what to charge.
ok, now I feel really stupid. They asked for a half sheet cake and I made 2 9x13's and was planning on putting them side by side. So what size really is a half sheet cake? I did a search here and I guess I was wrong in thinking half sheet was like two 9x13! Do I sale it to them anyway?
You can put two 9x13's together to make a 1/2 sheet cake....
(A 1/2 sheet is 12x18, yours will be 13x18.)
Here's a thread on sheet cake sizes: