I don't know the answer to this, but I know where you can get it. There's a chart on the Wilton site (www.wilton.com) that tells how many servings each size two-layer tier gives, how many cups of batter you need and how much icing/fondant you need to cover it. That ought to tell you in a heartbeat how to get the servings you want out of two round tiers.
A two tier round cake to serve 150 is going to look really strange. Those will be two LARGE tiers. I would suggest either adding another tier so it will look more balanced, or making a smaller two tier cake and add kitchen cakes to make up the difference in servings.
http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm Here is the servings per pan chart Marianna referred to.
AMost people use the Wilton wedding serving chart for all cakes. No matter whether a grooms cake or wedding cake the servings would be the same. You will need to get the bride to narrow down the required servings though, 100 - 150 is way too broad. No way you can accurately plan, make or charge for that wide of a range.
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Original message sent by Ursula40
Won't there be a wedding cake as well? Best ask the bride, how large she wants the cake to be. If there are two cakes, both serving the exact wedding count, they will be left with a lot of cake
You need to discuss the number of guests and then figure the number of servings needed with the bride. That has to be done before you can start to figure out what pans to use. Are you also making the wedding cake? Is the grooms cake you are making for the wedding reception or for the rehearsal dinner the night before. We can't help you much more without knowing more information. As the professional, you need to discuss these basic questions with the bride and help guide her in the sizes, number of tiers based on her number of guests, size of wedding cake, etc, etc.
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