ring size conversion chart


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US Size	British	French	German	Japanese	Inside diameter in inches
0000	*	*	*	*	.390
00	*	*	*	*	.422
0	*	*	*	*	.454
1/2	A	*	*	*	.474
3/4	A 1/2	*	*	*	.482
1	B	*	*	1	.487
1 1/4	B 1/2	*	*	*	*
1 1/2	C	*	*	*	.503
1 3/4	C 1/2	*	*	*	*
2	D	41 1/2	13 1/2	2	.520
2 1/4	D 1/2	*	*	*	*
2 1/2	E	42 3/4	13 3/4	3	.536
2 3/4	E 1/2	*	*	*	*
3	F	44	14	4	.553
3 1/8	F 1/2	*	*	*	*
3 1/4	*	*	*	*	*
3 3/8	G	45 1/4	*	5	*
3 1/2	*	*	14 1/2	*	.569
3 5/8	G 1/2	*	*	6	*
3 3/4	H	46 1/2	*	*	*
4	H 1/2	*	15	7	.585
4 1/4	I	47 3/4	*	*	*
4 1/2	I 1/2	*	15 1/4	8	.601
4 5/8	J	49	15 1/2	*	*
4 3/4	*	*	*	*	*
5	J 1/2	*	15 3/4	9	.618
5 1/8	K	50	*	*	*
5 1/4	*	*	*	*	*
5 3/8	K 1/2	*	*	10	*
5 1/2	L	51 3/4	16	*	.634
5 3/4	*	*	*	*	*
5 7/8	L 1/2	*	*	*	*
6	M	52 3/4	16 1/2	12	.650
6 1/4	M 1/2	*	*	*	*
6 1/2	N	54	17	13	.666
7	O	55 1/4	17 1/4	14	.683
7 1/4	O 1/2	*	*	*	*
7 1/2	P	56 1/2	17 3/4	15	.699
7 3/4	P 1/2	*	*	*	*
8	Q	57 3/4	18	16	.716
8 1/4	Q 1/2	*	*	*	*
8 1/2			18 1/2	17	.732
8 5/8	R	59	*	*	*
8 3/4	*	*	*	*	*
8 7/8	R 1/2	*	*	*	*
9	*	*	19	18	.748
9 1/8	S	60 1/4	*	*	*
9 1/4	*	*	*	*	*
9 3/8	S 1/2	*	*	*	*
9 1/2	*	*	19 1/2	19	.764
9 5/8	T	61 1/2	*	*	*
9 3/4	*	*	*	*	*
10	T 1/2	*	20	20	.781
10 1/4	U	62 3/4	*	21	*
10 1/2	U 1/2	*	20 1/4	22	.797
10 5/8	V	63	*	*	*
10 3/4	*	*	*	*	*
11	V 1/2	*	20 3/4	23	.814
11 1/8	W	65	*	*	*
11 1/4	*	*	*	*	*
11 3/8	W 1/2	*	*	*	*
11 1/2	*	*	21	24	.825
11 5/8	X	66 1/4	*	*	*
11 3/4	*	*	*	*	*
11 7/8	X 1/2	*	*	*	*
12	Y	67 1/2	21 1/4	25	.846
12 1/4	Y 1/2	*	*	*	*
12 1/2	Z	68 3/4	21 3/4	26	.862
12 3/4	Z 1/2	*	*	*	*
13	*	*	22	27	.879
13 1/4	*	*	*	*	*
13 1/2	Z+2	*	*	30.2	.890
13 3/4	*	*	*	*	*
14	Z+3	*	*	31.4	.906
14 1/4	*	*	*	*	*
14 1/2	Z+4	*	*	32.7	.922
14 3/4	*	*	*	*	*
15	Z+5	*	*	33.9	.938
15 1/4	*	*	*	*	*
15 1/2	Z+6	*	*	35.2	.954
15 3/4	*	*	*	*	*
16	Z+7	*	*	36.4	.970
16 1/4	*	*	*	*	*
16 1/2	Z+8	*	*	37.6	.986
16 3/4	*	*	*	*	*
17	Z+9	*	*	38.9	1.002