International Ring Size Conversion Chart

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International Ring Size Conversion Chart

International Ring Size Conversion Chart

Size (mm)*	Diameter (mm)	U.S. Size	U.K./Aust Size
48	15.27	4 1/2	I 1/2
49	15.7	5	J 1/2
51	16.1	5 1/2	L
52	16.51	6	M
53	16.92	6 1/2	N
55	17.35	7	O
56	17.75	7 1/2	P
57	18.19	8	Q
58	18.53	8 1/2	Q 1/2
59	18.89	9	R 1/2
61	19.41	9 1/2	S 1/2
62	19.84	10	T 1/2
63	20.2	10 1/2	U 1/2
65	20.68	11	V 1/2
66	21.08	11 1/2	W.5
68	21.49	12	Y
69	21.89	12 1/2	Z
70	22.33	13	~Z+1
71	22.75	13 1/2	~Z+2
72	23.16	14	~Z+3