You can measure your ring size by wrapping string snug around the base of your finger, marking where it overlaps, lying the string flat, and measuring it.

When corroborating circumference with the concomitant sizing, check how this sizing fits with your knuckle. If you find that you are in between sizes, I recommend sizing up. However, this should not be too much of an issue as I do not offer sizes with discrete values.

If this method is too complicated, ring sizers are available online and very affordable :)