Ring Size Chart

Circumference
(mm)
US
Canada
UK
Europe 
China
Singapore
Japan
46.8 4 H 7
47.4 4.25 H1/2 7.5
48 4.5 I 8
48.7 4.75 J 8.5
49.3 5 J1/2 9
50 5.25 K 9.5
50.6 5.5 K1/2 10
51.2 5.75 L 10.5
51.9 6 L1/2 11
52.5 6.25 M 12
53.1 6.5 M1/2 13
53.8 6.75 N 13.5
54.4 7 N1/2 14
55.1 7.25 O 14.5
55.7 7.5 O1/2 15
56.3 7.75 P 15.5
57 8 P1/2 16
57.6 8.25 Q 16.5
58.3 8.5 Q1/2 17
58.9 8.75 R 17.5
59.5 9 R1/2 18
60.2 9.25 S 18.5
60.8 9.5 S1/2 19
61.4 9.75 T 19.5
62.1 10 T1/2 20