Ring Size Conversion

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International Ring Size Conversion Chart J Mauer International Ring Size Conversion Chart
Use this chart to convert other standards to the US ring sizes.

US Size	Dia.in inch	Dia. in MM	British	French	German	Japanese	Swiss
3	.553	14.05	F	44	14	4	4
3 1/4	-	14.25	-	-	-
3 1/2	.569	14.45	-	-	14 1/2
3 3/4	-	14.65	H	46 1/2			6 1/2
4	.585	14.86	H 1/2	-	15	7
4 1/4	-	15.04	I	47 3/4			7 3/4
4 1/2	.601	15.27	I 1/2	-	15 1/4	8
4 3/4	-	15.53	-	-
5	.618	15.70	J 1/2	-	15 3/4	9
5 1/4	-	15.90	-	-
5 1/2	.634	16.10	L	51 3/4	16		11 3/4
5 3/4	-	16.30	-	-
6	.650	16.51	M	52 3/4	16 1/2	12	12 3/4
6 1/4	-	16.71	M 1/2	-
6 1/2	.666	16.92	N	54	17	13	14
6 3/4	-	17.13	N 1/2	-
7	.683	17.35	O	55 1/4	17 1/4	14	15 1/4
7 1/4	-	17.45	O 1/2	-
7 1/2	.699	17.75	P	56 1/2	17 3/4	15	16 1/2
7 3/4	-	17.97	P 1/2	-
8	.716	18.19	Q	57 3/4	18	16	17 3/4
8 1/4	-	18.35	Q 1/2	-
8 1/2	.732	18.53	-	-	18 1/2	17
8 3/4	-	18.69	-	-
9	.748	18.89	-	-	19	18
9 1/4	-	19.22	-	-
9 1/2	.764	19.41	-	-	19 1/2	19
9 3/4	-	19.62	-	-
10	.781	19.84	T 1/2	-	20	20
10 1/4	-	20.02	U	62 3/4		21	22 3/4
10 1/2	.797	20.20	U 1/2	-	20 1/4	22
10 3/4	-	20.44	-	-
11	.814	20.68	V 1/2	-	20 3/4	23
11 1/4	-	20.85	-	-
11 1/2	-	21.08	-	-	21	24
11 3/4	-	21.24	-	-
12	.846	21.49	Y	67 1/2	21 1/4	25	27 1/2
12 1/4	-	21.69	Y 1/2	-
12 1/2	.862	21.89	Z	68 3/4	21 3/4	26	28 3/4
12 3/4	-	22.10	Z 1/2	-
13	.879	22.33	-	-	22	27

This guide is to be used as a quick reference. For exact ring size measurement, please order one of our RING SIZERS.