I have a wedding cake to do in December and just realized that I mistakenly wrote down the incorrect size cake in the contract. The couple is going to have a rather odd cake with a sheet cake and then a small tiered cake on pillars on top. (Their idea, not mine.) Anyway, I wrote that I would be supplying a full sheet cake when that is going to give them way too many servings since they're only going to have about 100 people at the reception and, according to Wilton, that cake alone should feed 108 (12x18?). Should I tell them about the mistake and try to get another contract signed or just deal with my error? They've ordered a groom's cake, too, so they're going to have soooo much cake!

Btw, I wrote another post elsewhere about sheet cake sizes. People have told me to use 2 9x13s for a 1/2 sheet but that seems so big. Someone, please set me straight on stinkin' sheet cakes!!!

Apparently the Wilton cake servings guide is very mean. Someone sent me a link to another one which seems much more reasonable:
http://www.earlenescakes.com/ckserchart.htm

I dont care what Wilton says.. in my opinion, a 12 x 18 sheet cake is NOT going to feed 108 people.. unless the darn thing is 6 inches high and the slices are paper thin. Just my 2 cents here.

In my area cake sizes tend to be somewhat different that most other places.

9 x 13 -- 1/4 sheet feed 25 generously possibly 30

11 x 15 feeds approx. 40

12 x 18 feeds approx 60-65


for my personal use.. I have a commercial 1/2 sheet pan. It measures 11 1/2 x 17 x 1 1/2 inches.. I get 48 - 50 pieces out of this size. I put two of these side by side to make a cake to feed 100

All of my sheet cakes are two layers of cake and 1 layer of filling.

I hope this helps. (and not causes more confusion )

I usually get 96 servings from a 24x18, 48 from a 12x 18 and 24 on a 9x12. That is cut approximately 2x2. I would say it might be best to contact the client and let them know about the error. If they balk, then you'll have to honor the contract, if not then write down the date, time, and correction on your copy, and send them the revision, you may have them sign the revision and return to you.