We use this chart by Wendy's Cake Art for our sizes...
http://www.wendyscakeart.com/Serving_chart_%26_cake_cutting.html
I wouldn't think so...you are doing a 3 layer cake...
A 4" tall 9"x13" cake serves 50... this is the industry standard chart:
http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm
Sorry....I misunderstood your question... We don't use the wedding servings unless its a wedding cake. We just prefer this chart because it gives people more of what they think of as a "serving" where we live.. The standard serving size is a bit small for our customer base...lol
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