the charts on CC say you would get 170 without the sheet cakes..........are you figuring for the top tier NOT being eaten too??? here is a link for earlene's cakes too......evidentally her servings are a little more generous!
http://www.earlenescakes.com/ckserchart.htm
the 14, 12, and 8 should give you 125 servings. If the 6" will be for anniversary, it doesn't count obviously. If they cut a full sheet into 60 servings, and a 12 x 18 is only a half sheet, then you should have 180 servings total...am I not correct on this one? If they cut each 12 x 18 into 60 servings you would have 245 small servings.
I have to say I'm going by Earlene's serving sizes, not Wilton's. I think it would depend on who cut the cake.
I make those cakes, without the 6in, as coming out to 263 servings. 14in = 75 servings, 12in = 56 servings, 8in = 24 servings, each 12x18 sheet = 54 servings. Considering that not everyone will want cake, I'd say that you'll be fine.
How about a 14, 12 & 9, that would give you 160 servings. I'd still argue that your sheet cakes will only give you 54 servings (you will have to cut a single layer sheet cake in a 2x2x2in slice to have the equivalent of a 1x2x4in normal wedding serving!), so that gives you another 108 sevings = 278 servings total.
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