INTERNATIONAL RING SIZE CONVERSION CHART
USA & Canada Standard	British Equivalent	French Equivalent	German Equivalent	Japanese Equivalent	Swiss Equivalent	Average Diameter In Millimeters	Average Diameter In Inches
1	B			1		12.37	0.487
2	D	41 1/2	13 1/4	2	1 1/2	13.25	0.520
2 1/2	E	42 3/4	13 3/4	3	2 3/4	13.75	0.536
3	F	44	14	4	4	14.00	0.553
3 1/2	G-G-1/2	46	14 1/2	5-6	5 1/2	14.50	0.569
4	H-1/2	47	15	7	7 1/4	15.00	0.585
4 1/2	I-1/2	48	15 1/4	8	8 1/4	15.25	0.601
5	J 1/2	49 1/2	15 3/4	9	9 1/2	15.75	0.618
5 1/2	L	51 3/4	16	10-11	11 3/4	16.00	0.634
6	M	52 3/4	16 1/2	12	12 3/4	16.50	0.650
6 1/2	N	54	17	13	14	17.00	0.666
7	O	55 1/4	17 1/4	14	15 1/4	17.25	0.683
7 1/2	P	56 1/2	17 3/4	15	16 1/2	17.75	0.699
8	Q	57 3/4	18	16	17 3/4	18.00	0.716
8 1/2	Q-1/2-R	58 1/4	18 1/2	17	18	18.50	0.732
9	R-1/2-S	60	19	18	20	19.00	0.748
9 1/2	S-1/2-T	61	19 1/2	19	21	19.50	0.764
10	T-1/2	62	20	20	22	20.00	0.781
10 1/2	U-1/2	63	20 1/4	22	23	20.25	0.797
11	V-1/2	64 1/2	20 3/4	23	24 1/2	20.75	0.814
11 1/2	W-1/2-X	65 1/2	21	24	26	21.00	0.830
12	Y	67 1/2	21 1/4	25	27 1/2	21.50	0.846
12 1/2	Z	68 3/4	21 3/4	26	28 3/4	21.75	0.862
13			22	27		22.00	0.879