Ring Size Conversion Chart

Some sizes are approximated. For example, EU size 51 is equivalent to US size 5 5/8. Since we do not have size 5 5/8 on this chart, EU size 51 is approximately converted to US size 5 1/2.

Inside Diameter		Inside Circumference		Sizes
MM	Inches	MM	Inches	US & Canada	UK & Australia	EU	Japan	Hong Kong
9.91	0.390	31.13	1.22	0000	-	-	-	-
10.72	0.442	33.68	1.39	00	-	-	-	-
11.53	0.454	36.22	1.43	0	-	-	-	-
11.95	0.474	37.54	1.49	1/2	A	-	-	-
12.18	0.482	38.26	1.51	3/4	A 1/2	-	-	-
12.37	0.487	38.86	1.53	1	B	-	-	-
12.60	0.496	39.58	1.56	1 1/4	B 1/2	-	-	-
12.78	0.503	40.15	1.58	1 1/2	C	-	-	-
13.00	0.512	40.84	1.61	1 3/4	C 1/2	-	1	3
13.21	0.520	41.50	1.63	2	D	42	2	4
13.41	0.528	42.13	1.66	2 1/4	D 1/2	-	-	-
13.61	0.536	42.76	1.68	2 1/2	E	43	3	5
13.83	0.544	43.45	1.71	2 3/4	E 1/2	-	-	-
14.05	0.553	44.14	1.74	3	F	44	4	6
14.15	0.557	44.45	1.75	3 1/8	F 1/2	-	-	-
14.25	0.561	44.77	1.76	3 1/4	F 3/4	45	-	-
14.36	0.565	45.11	1.77	3 3/8	G	-	5	-
14.45	0.569	45.40	1.79	3 1/2	G 1/4	-	-	7
14.56	0.573	45.74	1.80	3 5/8	G 1/2	46	-	-
14.65	0.577	46.02	1.81	3 3/4	H	-	6	-
14.86	0.585	46.68	1.84	4	H 1/2	47	-	8.5
15.04	0.592	47.25	1.86	4 1/4	I	-	7	9
15.27	0.601	47.97	1.89	4 1/2	I 1/2	48	-	-
15.40	0.606	48.38	1.90	4 5/8	J	-	8	-
15.53	0.611	48.79	1.92	4 3/4	J 1/4	-	-	10
15.70	0.618	49.32	1.94	5	J 1/2	49	9	-
15.80	0.622	49.64	1.95	5 1/8	K	-	-	11
15.90	0.626	49.95	1.97	5 1/4	K 1/4	50	-	-
16.00	0.630	50.27	1.98	5 3/8	K 1/2	-	10	-
16.10	0.634	50.58	1.99	5 1/2	L	-	-	12
16.30	0.642	51.21	2.02	5 3/4	L 1/4	51	11	-
16.41	0.646	51.55	2.03	5 7/8	L 1/2	-	-	-
16.51	0.650	51.87	2.04	6	M	52	12	13
16.71	0.658	52.50	2.07	6 1/4	M 1/2	-	-	-
16.92	0.666	53.16	2.09	6 1/2	N	53	13	14
17.13	0.674	53.82	2.12	6 3/4	N 1/2	54	-	15
17.35	0.683	54.51	2.15	7	O	-	14	-
17.45	0.687	54.82	2.16	7 1/4	O 1/2	55	-	16
17.75	0.699	55.76	2.20	7 1/2	P	56	15	-
17.97	0.707	56.45	2.22	7 3/4	P 1/2	-	-	17
18.19	0.716	57.15	2.25	8	Q	57	16	17.5
18.35	0.722	57.65	2.27	8 1/4	Q 1/2	59	17	-
18.53	0.729	58.21	2.29	8 1/2	Q 3/4	-	-	19
18.61	0.733	58.47	2.30	8 5/8	R	-	-	-
18.69	0.736	58.72	2.31	8 3/4	R 1/4	59	18	-
18.80	0.740	59.06	2.32	8 7/8	R 1/2	-	-	-
18.89	0.748	59.34	2.35	9	R 3/4	-	-	20
19.10	0.752	60.00	2.36	9 1/8	S	60	19	-
19.22	0.757	60.38	2.38	9 1/4	S 1/4	-	-	-
19.31	0.760	60.66	2.39	9 3/8	S 1/2	-	-	-
19.41	0.764	60.98	2.40	9 1/2	S 3/4	61	20	21
19.51	0.768	61.29	2.41	9 5/8	T	-	-	-
19.62	0.772	61.64	2.43	9 3/4	T 1/4	-	21	-
19.84	0.781	62.33	2.45	10	T 1/2	62	-	22.5
20.02	0.788	62.89	2.48	10 1/4	U	63	22	23
20.20	0.797	63.46	2.50	10 1/2	U 1/2	-	-	-
20.32	0.800	63.84	2.51	10 5/8	V	64	-	-
20.44	0.805	64.21	2.53	10 3/4	V 1/4	-	23	24
20.68	0.814	64.97	2.56	11	V 1/2	-	-	-
20.76	0.817	65.22	2.57	11 1/8	W	65	24	25
20.85	0.821	65.50	2.58	11 1/4	W 1/4	-	-	-
20.94	0.824	65.78	2.59	11 3/8	W 1/2	-	-	-
21.08	0.830	66.22	2.61	11 1/2	W 3/4	66	25	-
21.18	0.834	66.54	2.62	11 5/8	X	-	-	26
21.24	0.836	66.73	2.63	11 3/4	X 1/4	-	-	-
21.30	0.839	66.92	2.64	11 7/8	X 1/2	67	26	-
21.49	0.846	67.51	2.66	12	Y	-	-	27
21.69	0.854	68.14	2.68	12 1/4	Y 1/2	68	27	-
21.89	0.862	68.77	2.71	12 1/2	Z	-	-	28
22.10	0.870	69.43	2.73	12 3/4	Z +1/2	69	28	-
22.33	0.879	70.15	2.76	13	Z+1	70	29	29.5
22.60	0.890	71.00	2.80	13.5	Z+1.5	-	30	-
22.69	0.893	71.28	2.81	-	Z+2	-	-	-
22.92	0.902	72.00	2.83	-	Z+2.5	-	-	-
23.06	0.908	72.45	2.85	14	Z+3	-	31	-
23.24	0.915	73.01	2.87	-	Z+3.5	-	-	-
23.47	0.924	73.73	2.90	-	Z+4	-	-	-
23.55	0.927	73.98	2.91	14.5	Z+4.5	74	32.5	33
23.87	0.940	74.99	2.95	15	Z+5	75	33.5	34
24.27	0.956	76.25	3.00	-	Z+6	-	-	-

Currency

Ring Size Conversion Chart

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