Based on reviews, I ordered a size 9 when I wear a size 8. They fit fine with a little extra room, which came in handy because I put some gel inserts in to save my feet. I LOVE THESE SHOES. People comment on them all the time and they are as cute in person as they are in the picture. I love wearing them! I'm usually cheap when it comes to shoes and usually don't pay this much for shoes but I would definitely do it again. They're a favorite!