AI'm not sure this should be under cake decorating. I wasn't sure which forum I should put this question under.

I'm making my son's birthday cake. An 8 inch round on top of a 12 inch round. I'm not familiar with serving sizes. Would that be enough for 30-40 people?

Thanks!

ABased on Wilton's party serving sizes (1.5" x 2") a 12/8 round should yield 60 servings, assuming you cut it the way Wilton recommends (second link).

http://www.wilton.com/cakes/making-cakes/baking-party-cake-2-inch-pans.cfm http://www.wilton.com/cakes/cake-cutting-guides/party-cake-cutting-guide.cfm

Welcome to CakeCentral.  Cutting a "recommended serving size" is more difficult that it looks or sounds.  It's a good idea to make a practice cake to cut into individual servings if YOU are the person who will be cutting and serving the cake.

Are the 8" cakes and 10" cakes going to be 4" high or 2" high?  The "standard" is 4" high.    It is generally expressed in writing as 8" round x 4" high on top of 10" round x 4" round. (or square or whatever)

Here are some wonderful links that should give you all the information you'll need.  Other cakers have provided this information online for free (bless their hearts!)

The 2 links above provided by jasonkraft are the industry/USA standard for party cakes, which are typically 3"-5" high sheet cakes with filling in the middle.

The industry standard for wedding cake serving sizes (4" high) in the USA:

http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm

http://cateritsimple.blogspot.com/search/label/cake%20comb

http://larkcakeshop.com/CakeServeGuide2.pdf

http://www.wilton.com/forums/messageview.cfm?catid=8&threadid=142470&FTVAR_MSGDBTABLE=

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Have fun at the party! 

AWow thanks you guys! The cakes will each be 4 inches high. I'm going to supervise whoever cuts thr cake. Most likely my sister in law. I'll just whisper to her to not cut them super big lol. We're having between 30 and 40 people, so I'm pretty sure it's enough cake. I'm just nervous because, as you might have guessed, I'm not a baker. I took up baking just to learn how to bake my son's cake. He's turning 1!!!! I'm super excited.

Thanks for all your help guys. Appreciate it! !

You are most welcome!  CakeCentral helped me a HUGE amount when I was starting out with all the cake stuff, this is just paying back.  Congrats on your son's 1st birthday.    The biggest help would be to make the paper or cardstock "pretend-piece-of-cake" and have that on hand before he cake is cut to give the perfect reference for how big each serving should look like on the plate.

AAwesome! Never would have thought of that!! Thx again! !

What a bright idea, people are so inventive.  I knew a person who used pieces of Styrofoam to explain slice serving sizes.