Ring Size Conversion Chart

Inner Diam MM	Inner Circum MM	US / Canada / Mexico	UK / Australia / South Africa	Germany	France / Russia	China / Japan / South America	Italy / Spain / Switzerland
11.95	37.54	1/2	A	-	-	-	-
12.18	38.26	3/4	A 1/2	-	-	-	-
12.37	38.86	1	B	-	-	1	-
12.6	39.58	1 1/4	B 1/2	-	-	-	-
12.78	40.15	1 1/2	C	-	-	-	-
13	40.84	1 3/4	C 1/2	-	-	-	-
13.21	41.5	2	D	13 1/2	41 1/2	2	1 1/2
13.41	42.13	2 1/4	D 1/2	-	-	-	-
13.61	42.76	2 1/2	E	13 3/4	42 3/4	3	2 3/4
13.83	43.45	2 3/4	E 1/2	-	-	-	-
14.05	44.14	3	F	14	44	4	4
14.15	44.45	3 1/8	F 1/2	-	-	-	-
14.25	44.77	3 1/4	F 3/4	-	-	-	-
14.36	45.11	3 3/8	G	-	45 1/4	5	5 1/4
14.45	45.4	3 1/2	G 1/4	14 1/2	-	-	-
14.56	45.74	3 5/8	G 1/2	-	-	6	-
14.65	46.02	3 3/4	H	-	46 1/2	-	6 1/2
14.86	46.68	4	H 1/2	15	-	7	-
15.04	47.25	4 1/4	I	-	47 3/4	-	7 3/4
15.27	47.97	4 1/2	I 1/2	15 1/4	-	8	-
15.4	48.38	4 5/8	J	15 1/2	49	-	9
15.53	48.79	4 3/4	J 1/4	-	-	-	-
15.7	49.32	5	J 1/2	15 3/4	-	9	-
15.8	49.64	5 1/8	K	-	50	-	10
15.9	49.95	5 1/4	K 1/4	-	-	-	-
16	50.27	5 3/8	K 1/2	-	-	10	-
16.1	50.58	5 1/2	L	16	51 3/4	-	11 3/4
16.3	51.21	5 3/4	L 1/4	-	-	-	-
16.41	51.55	5 7/8	L 1/2	-	-	-	-
16.51	51.87	6	M	16 1/2	52 3/4	12	12 3/4
16.71	52.5	6 1/4	M 1/2	-	-	-	-
16.92	53.16	6 1/2	N	17	54	13	14
17.13	53.82	6 3/4	N 1/2	-	-	-	-
17.35	54.51	7	O	17 1/4	55 1/4	14	15 1/4
17.45	54.82	7 1/4	O 1/2	-	-	-	-
17.75	55.76	7 1/2	P	17 3/4	56 1/2	15	16 1/2
17.97	56.45	7 3/4	P 1/2	-	-	-	-
18.19	57.15	8	Q	18	57 3/4	16	17 3/4
18.35	57.65	8 1/4	Q 1/2	-	-	-	-
18.53	58.21	8 1/2	Q 3/4	18 1/2	-	17	-
18.61	58.47	8 5/8	R	-	59	-	19
18.69	58.72	8 3/4	R 1/4	-	-	-	-
18.8	59.06	8 7/8	R 1/2	-	-	-	-
18.89	59.34	9	R 3/4	19	-	18	-
19.1	60	9 1/8	S	-	60 1/4	-	20 1/4
19.22	60.38	9 1/4	S 1/4	-	-	-	-
19.31	60.66	9 3/8	S 1/2	-	-	-	-
19.41	60.98	9 1/2	S 3/4	19 1/2	-	19	-
19.51	61.29	9 5/8	T	-	61 1/2	-	21 1/2
19.62	61.64	9 3/4	T 1/4	-	-	-	-
19.84	62.33	10	T 1/2	20	-	20	-
20.02	62.89	10 1/4	U	-	62 3/4	21	22 3/4
20.2	63.46	10 1/2	U 1/2	20 1/4	-	22	-
20.32	63.84	10 5/8	V	-	63	-	23 3/4
20.44	64.21	10 3/4	V 1/4	-	-	-	-
20.68	64.97	11	V 1/2	20 3/4	-	23	-
20.76	65.22	11 1/8	W	-	65	-	25
20.85	65.5	11 1/4	W 1/4	-	-	-	-
20.94	65.78	11 3/8	W 1/2	-	-	-	-
21.08	66.22	11 1/2	W 3/4	21	-	24	-
21.18	66.54	11 5/8	X	-	66 1/4	-	26 1/4
21.24	66.73	11 3/4	X 1/4	-	-	-	-
21.3	66.92	11 7/8	X 1/2	-	-	-	-
21.49	67.51	12	Y	21 1/4	67 1/2	25	27 1/2
21.69	68.14	12 1/4	Y 1/2	-	-	-	-
21.89	68.77	12 1/2	Z	21 3/4	68 3/4	26	28 3/4
22.1	69.43	12 3/4	Z +1/2	-	-	-
22.33	70.15	13	Z+1	22	-	27
22.6	71	13.5	Z+1.5	-	-	-