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Ring Size Guide

There is several different ring size systems used worldwide. However, We are using the Hong Kong measurement system to define the size of ring. Thus, in the following we provide a table convert different ring size into Hong Kong size.

Ring Size Chart

Inter- Diameter
(mm)
Hong Kong
Size
American
Size
United Kingdom
Size
Japan
Size
Switzerland
Size
14.1 6 3 F 4 4
14.3 7 3.25 F 1/2 5 5.25
14.7 8 3.75 G 6 6.5
14.9 9 4 H 7 7
15.3 10 4.5 I 8 8.5
15.7 11 5 J 1/2 9 9.5
16.1 12 5.5 K 1/2 10 10.5
16.5 13 6 L 1/2 11 12.75
16.7 14 6.25 M 12 13.5
17.1 15 6.75 N 13.5 14.5
17.3 16 7 N 1/2 14 15.25
17.7 17 7.5 O 1/2 15 16.5
18.2 18 8 P 1/2 16.25 18.25
18.5 19 8.5 Q 1/2 17 18.75
18.8 20 9.75 R 17.5 19
19.1 21 9.25 S 18 20
19.4 22 9.5 S 1/2 19 20.75
19.8 23 10 T 1/2 20 21.75
20.2 24 10.5 U 1/2 22 22.75
20.6 25 11 V 1/2 23 24.75
21.0 26 11.5 W 1/2 24 26.25
21.2 27 12 X 24.5 26.75
21.6 28 12.25 Y 25.5 28
22.0 29 12.5 Z 1/2 26.5 29