We have a handy ring sizer you can order for $5! Add to cart below. Once you receive it, find the sizer ring that slips on to the finger comfortably but still offers some resistance around the knuckle when pulled on and off. It should sit snug at the base of the finger. Once you've found your match, find the number associated with the sizing ring. Be sure to use US sizing, which goes from 0–13 on our sizers. Half sizes are indicated by dashes, i.e. the “-6” is a size 6.5.