I wear a 6.5. Usually, the slippers I like don't come in half sizes so I used the drop-down sizing chart supplied by Dearforms. The chart says 6.5 to 7.5 is a medium so that's what I purchased. When I got them, the packaging clearly stated that a size medium fits 7 to 8. The slippers are too big for me and I have  to be very careful when I walk or my feet will slip out of them. I would have sent them back but they were on sale.