What would you recommend for 150 people? A full and a half sheet is what I'm thinking.
~Wendy

The serving guidelines that I have show that a full and a half sheet would work, if they're two layers. 60 servings per double layer cake. HTH

Really? That seems like a lot of cake if I make them both double layered. I was thinking a full sheet and a 12x18" sheet, single layer.

They also want a miniture wedding style cake (for an anniversary), triple tier, with chocolate mouse centers. I don't think the realize how much money they'll be spending, if they keep that plan.

~Wendy

a full and half sheet would be good, but it all depends on how big or small the slices will be.

Now that I think about it, two 1/2 sheets double layered might be what I want... plus it would balance out the table nicer. They want half white cake and half chocolate, so this is what I'll suggest. I think a 1/2 sheet double layered cake can easily serve 75. That is a lot of cake.

Thanks for your help!

If you all would stop using vague terms like "half" and "full", it might be easier.

Single Layer:
18x24 = "full" sheet. Cut in 2x2x2 = 108 servings (9 rows x 12 columns).
18x12 = "half" sheet. Cut in 2x2x2 = 54 servings (9 rows x 6 columns).

Double Layer:
18x24: Cut in 1x2x4 = 216 servings (18 rows x 12 columns)
18x12: Cut in 1x2x4 = 108 servings (12 rows x 9 columns)

Thanks indy - I never know what people are talking about when they write half and full either

put three of those 18 by 12 side by side and you will be good to go. we cut a 1/2 inch plywood board and use it for this size cake. see my photos, we do lots of sheet cakes for the local schools this size. single layer.