Ring Size Chart

Inner 
Diameter

Country Standard

(mm) HK US UK Euro Japan
15.25 9 4.25 I 48 8
15.62 10 4.75 J 49 9
15.95 11 5.25 K 50 10.5
16.35 12 5.5 K 1/2 51 11.5
16.60 13 6 L 1/2 52.5 12.5
16.95 14 6.5 M 1/2 53.5 13.5
17.30 15 7 N 1/2 54.5 14.5
17.65 16 7.5 O 55.5 15.5
18.00 17 7.75 P 57 17
18.35 18 8.25 Q 58 18
18.70 19 8.5 R 59 18.5