Will a 8, 10, 12 square (4" high tiers) wedding cake serve 100 people discounting the 8 as the topper? There is such a big discrepancy between Wilton Party size (which I usually use), Wilton wedding and other charts.

8 square serves 32 / 10 square serves 50 / 12 square serves 72. So by my numbers, that serves 122 plus the 8" serves 32 = 154 total servings.

An 8" square is a pretty big top tier, though.

I always cut my cakes the wilton size (1x2x4 industry standard). We have plenty of cake and it's a nice size piece of cake. On my website is a step by step on how to cut cakes (round or square) to achieve these sizes. You can also see the size of the cut pieces in the same link. http://cateritsimple.com/_wsn/page10.html

I agree w/debi. Use her chart There is an industry standard of a wedding serving being 1x2x4. That's what you should base your pricing on. I cut a piece of styro to show customers. Also when they come for a tasting I give them about 1/2 that much (they usually are tasting 2-4 flavors) and explain that it is about 1/2. If they want bigger pieces let them purchase a bigger cake.

Good point on charging per the standard wedding size. I will do that. I think I get caught up on the idea that there won't be enough cake. That is always my biggest fear. I think my Grandmother did that to me