I have a square pan that isn't straight sided.. the bottom of the pan measures 8" while the top from edge to edge measures 9".. so which is it??? I need to bake this cake Tuesday...
If you want to determine the volume of batter you need, just fill the pan with water.
2" deep pans should be filled 2/3 full, while 3" pans should be filled 1/2 full (per Wilton):
I would consider it an 8" cake.
I would call it an 8" for the purposes of servings. I would assume you would want to trim the sides straight? At any rate, I'd still figure it is 8", and use above advice of figuring ou how much batter you need! I can't believe I never thought of that!
I"m thinking of not trimming the sides straight because I'm stacking a 6" heart on top of it... so the angle won't be a huge issue (I'm also putting some cornelli lace on the corners and down the sides..