Just wondering if anyone can tell me how much cake batter for an 8" square pan and a 5" square pan?

Thank you

Well an 8"x2" sq uses one cake mix; the 5 sq probably will need 1/2.
I'd make 2 and overfill the pans some, then make a few cupcakes.

6 1/2 cups for 8" and 2cups for the 5"

http://www.shopbakersnook.com/321.html

HTH! ~Mindy

Sorry wrong link. Try this one http://www.shopbakersnook.com/321.html

ok I give I don't know why it's posting the wrong link it keeps changing part of the link it should be shopbakersnook instead of shopcakecentral.

Also check out these charts on wilton. They have the most common sizes.

HTH
http://www.wilton.com/cake/cakeprep/baking/times/index.cfm