My current shoes are a 9 1/2 in mens'. In ladies' size, I'm around an 11 or 11 1/2, depending on what shoes I find.
The only thing I'm certain of is that it's hard for me to find shoes that I like in ladies' sizes, since most of the shoes that I think look good are too small, and the ones that are my size I don't like. >_< Thus why my shoes right now are in a mens' size, since I couldn't find anything else last time I went shopping.