International Ring Size Conversion Chart

Published by elementswinkel Admin on March 5, 2025

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Finding the right ring size can be tricky, especially with different sizing systems around the world. Our International Ring Size Conversion Chart makes it easy to compare US, UK, EU, and other sizes, ensuring a perfect fit every time.

International Ring Size Conversion Chart

Circumference (mm) Europe / ISO	Diameter (mm)	USA / Canada	UK / Australia	Asia	Switzerland
44.2	14.1	3	F	4	4
44.8	14.3		F-1/2	5	5-1/4
45.5	14.5	3-1/2	G
46.1	14.7		G-1/2	6	6-1/2
46.8	14.9	4	H	7
47.4	15.1		H-1/2		7-3/4
48.0	15.3	4-1/2	I	8
48.7	15.5		J		9
49.3	15.7	5	J-1/2	9
50.0	15.9		K		10
50.6	16.1	5-1/2	K-1/2	10
51.2	16.3		L		11-3/4
51.9	16.5	6	L-1/2	11	12-3/4
52.5	16.7		M	12
53.1	16.9	6-1/2	M-1/2	13	14
53.8	17.1		N
54.4	17.3	7	N-1/2	14	15-1/4
55.1	17.5		O
55.7	17.7	7-1/2	O-1/2	15	16-1/2
56.3	17.9		P
57.0	18.1	8	P-1/2	16	17-3/4
57.6	18.3		Q
58.3	18.5	8-1/2	Q-1/2	17
58.9	18.8		R		19
59.5	19.0	9	R-1/2	18
60.2	19.2		S		20-1/4
60.8	19.4	9-1/2	S-1/2	19
61.4	19.6		T		21-1/2
62.1	19.8	10	T-1/2	20
62.7	20.0		U	21
63.4	20.2	10-1/2	U-1/2	22	22-3/4
64.0	20.4		V
64.6	20.6	11	V-1/2	23
65.3	20.8		W		25
65.9	21.0	11-1/2	W-1/2	24
66.6	21.2		X
67.2	21.4	12	X-1/2	25	27-1/2
67.8	21.6		Y
68.5	21.8	12-1/2	Z	26	28-3/4
69.1	22.0		Z-1/2
69.7	22.2	13		27
70.4	22.4		Z + 1
71.0	22.6	13-1/2

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International Ring Size Conversion Chart

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