If you want to find your ring size, grab a ring that already fits your finger comfortably and measure its inner dimension in millimeters. Ignore the outside of the ring as it won't give you the correct size.

For example, the inner dimension of this ring measures 17mm, so the ring size would be M 3/4. If your ring is closer to the outside of the mm measurement lines, go for the larger size, like N in this case. But if it's closer to the inside, choose the smaller size, again, in this case it would be M 1/2.

If you're confused or have any questions about sizing, don't hesitate to ask!