Ring Size Chart

Inner 
Diameter

Country Standard

(mm) HK US UK Euro Japan
15.25 9 4.5 I 47.5 8
15.62 10 5 J 49.5 9
15.95 11 5.25 J 1/2 50.5 10.5
16.35 12 5.75 K 1/2 51.5 11.5
16.60 13 6 L 52.5 12.5
16.95 14 6.5 M 1/2 53.5 13.5
17.30 15 7 N 54.5 14.5
17.65 16 7.5 O 55.5 15.5
18.00 17 7.75 O 1/2 56.5 17
18.35 18 8.25 P 58 18
18.70 19 8.75 Q 59 18.5