To determine ring size at home, measure your finger with a strip of paper or string. Wrap the paper or string around the base of the intended finger, and then mark where the paper overlaps. The length of the paper you measured in millimeters or inches is the circumference of your finger. After finding this measurement, see below conversions to find your ring size.
US STANDARD RING SIZING IN MM XS (RING SIZE 4-5) = 14.9MM - 15.7MM S (RING SIZE 6-7) = 16.5MM - 17.3MM M (RING SIZE 8-9) = 18.2MM - 18.9MM L (RING SIZE 10-11) = 19.8MM - 20.7MM
US STANDARD RING SIZING IN IN XS (RING SIZE 4-5) = 1 13/16IN - 2IN S (RING SIZE 6-7) = 2 1/16IN - 2 3/16IN M (RING SIZE 8-9) = 2 5/16IN - 2 7/16IN L (RING SIZE 10-11) = 2 9/16IN - 2 11/16IN