I notice a lot of people asking about this subject. This is a great link that you should find very helpful!
www.bakedecoratecelebrate.com/techniques/amountbakingguide.cfm
All of the servings shown are for sizes larger than the industry standard of 1x2x4. It looks like they are for 1-1/2"x2"x4" servings. So if you use these your per serving price would be more, or your giving away free cake.
Wilton's main site has one just like this (with the batter amounts, icing amounts, etc...) for the industry standard serving of 8 cubic inches of cake (either 2x2x2 or 1x2x4)
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