To find your ring size: Simply measure the circumference (distance around) your finger (with something flexible, such as a strip of paper or piece of string, and a ruler with milimeter measurements). Or, measure the diameter (distance across) in milimeters of a ring you currently wear. Find the nearest measurement on the chart below. That's approximately your ring size. (When in doubt between two sizes, it is always safer to go to the next larger ring size. This ensures your new ring will fit you.)