Ring size comparison chart

*The following ring size comparison information is for reference only

Inner circumference Circumference (mm)	Inner ring diameter Diameter (mm)	USA USA	Hongkong Hong Kong	Europe Europe	U.K. UK	Japan Japanese
43	13.69			43	E	3
43.3	13.78		5
44	14.01			44		4
44.3	14.10	3	6		F
45	14.32			45		5
45.5	14.48	3.5	7		G
46	14.64			46		6
46.5	14.80		8
47	14.96	4		47	H	7
47.7	15.18		9
48	15.28	4.5		48	I	8
48.7	15.50		10		J
49	15.60	5		49		9
49.9	15.88		11
50	15.92			50	K	10
50.9	16.20	5.5	12
51	16.23			51	L	11
52	16.55	6		52		12
52.1	16.58		13		M
53	16.87			53		13
53.1	16.90	6.5	14
54	17.19			54	N	14
54.3	17.28	7	15
55	17.51			55	O	15
55.6	17.70	7.5	16
56	17.83			56		16
56.5	17.98		17		P
57	18.14	8		57		17
57.5	18.30		18		Q
58	18.46	8.5		58		18
58.7	18.68		19
59	18.78			59	R	19
59.7	19.00	9	20
60	19.10			60	S	20
60.9	19.39	9.5	twenty one
61	19.42			61	T	twenty one
61.9	19.70		twenty two
62	19.74	10		62		twenty two
63	20.05			63	U	twenty three
63.1	20.09	10.5	twenty three
64	20.37			64	V	twenty four
64.1	20.40		twenty four
65	20.69	11		65		25
65.3	20.79		25		W
66	21.01	11.5		66		26
66.3	21.10		26
67	21.33			67	X	27
67.5	21.49	12	27
68	21.65			68	Y	28
68.5	21.80	12.5	28		Z
69	21.96			69		29
69.7	22.19	13	29
70	22.28			70		30
70.7	22.50		30

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