Guide to Ring Size

It is important to know your ring size when buying a ring. Factors such as season and time of day can affect your ring size. Also, ring sizes may vary internationally. Heres a list of ring sizes and international conversion.
Ring Size 6
An American size 6 ring is 0.650 diameters in inches and16.5 in millimeters. Its circumference is 2.041 in inches and 51.8 in millimeters. The Irish, Australian and British size equivalent is L , the Japanese equivalent is 11 and the Swiss equivalent is12.75.
Ring Size 7
An American size 7 ring is 0.682 diameters in inches and 17.3 in millimeters. Its circumference is 2.141 in inches and 54.4 in millimeters. The Irish, Australian and British size equivalent is N , the Japanese equivalent is 14 and the Swiss equivalent is15.25.
Ring Size 8
An American size 8 ring is 0.714 diameters in inches and18.1 in millimeters. Its circumference is 2.242 in inches and 56.9 in millimeters. The Irish, Australian and British size equivalent is P , the Japanese equivalent is 16 and the Swiss equivalent is17.75.
Ring Size 9
An American size 9 ring is 0.746 diameters in inches and18.9 in millimeters. Its circumference is 2.342 in inches and 59.5 in millimeters. The Irish, Australian and British size equivalent is R and the Japanese equivalent is 18.