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International Ring Size Converter

INSIDE DIAMETER US/CAN UK/AU EUROPE JAPAN
15 mm 4 H 46.5 7
15.3 mm 4.5 I 48 8
15.6 mm 5 J 49.5 9
16.2 mm 5.5 K 50.5 10
16.6 mm 6 L 52 11
16.9 mm 6.5 M 53 13
17.2 mm 7 N 54.5 14
17.8 mm 7.5 O 55.5 15
18.1 mm 8 P 57 16
18.5 mm 8.5 Q 58 17
19.1 mm 9 R 59.5 18
19.4 mm 9.5 S 61 19
19.7 mm 10 T 62 20
20.4 mm 10.5 U 63.5 22
20.7 mm 11 V 64.5 23

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