I think the Wilton serving sizes are unrealistic. Plus, I don't want to tell my clients that they have to cut a cake like Wilton would recommend. I would like my serving sizes to be 2"x2". I've been playing around with the best and easiest way to cut a cake and am kinda struggling with it. I would like your suggestions. I want to see how everyone else does it. Please explain how you have worked out your serving sizes or better yet, please show me a diagram or something. Thanks!

so if your cake is 4" high do you still want to serve a 2x2 piece? or are you just referring to sheet cakes?

Check out IndyDebi's serving chart.
To figure out a serving chart w/different sized servings trace an outline of each pan (do it on newspaper for bigger pans) then mark, count/cut into pieces you want. Make notes for future remembering. Maybe mark your pan w/permanent pen or one of those electric engravers.

I use the wilton wedding chart to determine pricing. I ALSO use this to determine the number of servings sold to the client.

most facilities cut the cut this size.

For kids birthday parties, the 1x2x4 is plenty of cake for a little kid. at weddings, when I'm cutting the cake, a lot of people ask me for "....a smaller piece, please."

Here's a photo of a 1x2x4 piece of cake: http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1156785 It's a nice, standard, dessert-sized piece of cake.

Here's the wilton wedding chart: http://www.wilton.com/wedding/wedding-cakes/wedding-cake-data.cfm

Here's my step by step photo on how to cut a cake to achieve those wilton servings. Cutting it this way, I actually get about 10% more servings (i.e. I get about 40-42 pieces from a 10" round instead of 38.) http://cateritsimple.com/_wsn/page10.html

A 2x2x4 is a huge piece of cake. If you offer that size of a serving, be sure you're charging twice the market rate in your area ... since you're giving them twice the amount of cake of most other places.