...after it has been iced and fondant covered. And then what size square cake stand would I need to hold that round cake board?

I'm getting geometry exam flashbacks, but not in a good way.

Here's the deal, I am making a 3 tier square wedding cake for my friend who can get a 17" or 20" square cake stand. My bottom tier will be 14" fondant covered. I want to use a round cake drum underneathe the bottom tier instead of a square for contrast but need to know if it can fit on one of the round stands.

She originally rented the 17" stand, but can change to the 20"if I let her know soon.

Can anyone help?

I should submit this question to the math teachers of America.

measure your cake pan from corner to corner. that's the widest point and should give you a good idea.

Of course, I feel foolish now.

ah, we all have some of those under our belt!

I think that, corner to corner, your 14" square pan is 19.79 inches... So you will need at least a 20" round. HTH