If you make a 4" or 6" tall cake, how do you calculate serving size? I would appreciate any input.

A member here, metria, has posted a cake calculator that she made, which will calculate the number of servings you can get from a cake either by volume or by the type and size of pan you're using. If you're calculating by volume, you have to put the size of each serving in before the program will do anything. A standard serving of cake is eight cubic inches - usually 1" x 2" x 4" for layered and tiered cakes or 2" x 2" x 2" for one-layer sheet cakes. Here's a link to her calculator:
http://shinymetalobjects.net/cake/calculator/cake_calculator.cgi

Marianna46, thank you for your help.

I am so glad I stumbled across this post! I needed servings on a full sheet cake 11x15x2, and this calculator was awesome! Thanks Marianna!

This is a great tool. I was looking for something like this, and of course Cake central had it. Thank you Marianna!