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Ring size international comparison

ISO (International Organization for Standardization): International standardization and unification of ISO 8653, a ring size standard that differs from country to country.


ISO-8653 Japan and USA, UK, Hong Kong comparison
Japan Diameter(mm) Inner circumference(mm) USA UK Hong Kong
41 1 13 40.8 1 C
42 2 13.3 41.9 2 D
43 3 13.7 42.9 2.5 E
44 Four 14 44.0 3 F 6
45 Five 14.3 45.0 7
46 6 14.7 46.1 3.5 G 8
47 7 15 47.1 Four H 9
48 8 15.3 48.2 4.5 I Ten
49 9 15.7 49.2 Five J 11
50 Ten 16 50.3 5.5 K 12
51 11 16.3 51.3 6 L 13
52 12 16.7 52.4 6.5 M 14
53 13 17 53.4 7 N 15
54 14 17.3 54.5 7.5 O 16
55 15 17.7 55.5 8 P 17
56 16 18 56.6 18
57 17 18.3 57.6 8.5 Q 19
58 18 18.7 58.6 9 R 20
59 19 19 59.7 9.5 S twenty one
60 20 19.3 60.7 twenty two
61 twenty one 19.7 61.8 Ten T twenty three
62 twenty two 20 62.8 10.5 U twenty four
63 twenty three 20.3 63.9 11 V twenty five
64 twenty four 20.7 64.9 11.5 W 26
65 twenty five twenty one 66.0 12 X 27
66 26 21.3 67.0 12.5 Y 28
67 27 21.7 68.0 13 Z 29