Sizing Guide

Please use the below as a guide only.
For more help with your sizing call us on For more help with your sizing call us on 046 943 7722 during store opening hours.

Ring Sizing Guide

Inside Diameter - MM	Inside Diameter - MM	Inside Circumference - Inches	Inside Circumference - Inches	Sizes - UK & Ireland	Sizes - US
9.91	0.390	31.13	1.22	-	0
10.72	0.442	33.68	1.39	-	0
11.53	0.454	36.22	1.43	-	0
11.95	0.474	37.54	1.49	A	1/2
12.18	0.482	38.26	1.51	A 1/2	3/4
12.37	0.487	38.86	1.53	B	1
12.60	0.496	39.58	1.56	B 1/2	1 1/4
12.78	0.503	40.15	1.58	C	1 1/2
13.00	0.512	40.84	1.61	C 1/2	1 3/4
13.21	0.520	41.50	1.63	D	2
13.41	0.528	42.13	1.66	D 1/2	2 1/4
13.61	0.536	42.76	1.68	E	2 1/2
13.83	0.544	43.45	1.71	E 1/2	2 3/4
14.05	0.553	44.14	1.74	F	3
14.15	0.557	44.45	1.75	F 1/2	3 1/8
14.25	0.561	44.77	1.76	F 3/4	3 1/4
14.36	0.565	45.11	1.77	G	3 3/8
14.45	0.569	45.40	1.79	G 1/4	3 1/2
14.56	0.573	45.74	1.80	G 1/2	3 5/8
14.65	0.577	46.02	1.81	H	3 3/4
14.86	0.585	46.68	1.84	H 1/2	4
15.04	0.592	47.25	1.86	I	4 1/4
15.27	0.601	47.97	1.89	I 1/2	4 1/2
15.40	0.606	48.38	1.90	J	4 5/8
15.53	0.611	48.79	1.92	J 1/4	4 3/4
15.70	0.618	49.32	1.94	J 1/2	5
15.80	0.622	49.64	1.95	K	5 1/8
15.90	0.626	49.95	1.97	K 1/4	5 1/4
16.00	0.630	50.27	1.98	K 1/2	5 3/8
16.10	0.634	50.58	1.99	L	5 1/2
16.30	0.642	51.21	2.02	L 1/4	5 3/4
16.41	0.646	51.55	2.03	L 1/2	5 7/8
16.51	0.650	51.87	2.04	M	6
16.71	0.658	52.50	2.07	M 1/2	6 1/4
16.92	0.666	53.16	2.09	N	6 1/2
17.13	0.674	53.82	2.12	N 1/2	6 3/4
17.35	0.683	54.51	2.15	O	7
17.45	0.687	54.82	2.16	O 1/2	7 1/4
17.75	0.699	55.76	2.20	P	7 1/2
17.97	0.707	56.45	2.22	P 1/2	7 3/4
18.19	0.716	57.15	2.25	Q	8
18.35	0.722	57.65	2.27	Q 1/2	8 1/4
18.53	0.729	58.21	2.29	Q 3/4	8 1/2
18.61	0.733	58.47	2.30	R	8 5/8
18.69	0.736	58.72	2.31	R 1/4	8 3/4
18.80	0.740	59.06	2.32	R 1/2	8 7/8
18.89	0.748	59.34	2.35	R 3/4	9
19.10	0.752	60.00	2.36	S	9 1/8
19.22	0.757	60.38	2.38	S 1/4	9 1/4
19.31	0.760	60.66	2.39	S 1/2	9 3/8
19.41	0.764	60.98	2.40	S 3/4	9 1/2
19.51	0.768	61.29	2.41	T	9 5/8
19.62	0.772	61.64	2.43	T 1/4	9 3/4
19.84	0.781	62.33	2.45	T 1/2	10
20.02	0.788	62.89	2.48	U	10 1/4
20.20	0.797	63.46	2.50	U 1/2	10 1/2
20.32	0.800	63.84	2.51	V	10 5/8
20.44	0.805	64.21	2.53	V 1/4	10 3/4
20.68	0.814	64.97	2.56	V 1/2	11
20.76	0.817	65.22	2.57	W	11 1/8
20.85	0.821	65.50	2.58	W 1/4	11 1/4
20.94	0.824	65.78	2.59	W 1/2	11 3/8
21.08	0.830	66.22	2.61	W 3/4	11 1/2
21.18	0.834	66.54	2.62	X	11 5/8
21.24	0.836	66.73	2.63	X 1/4	11 3/4
21.30	0.839	66.92	2.64	X 1/2	11 7/8
21.49	0.846	67.51	2.66	Y	12
21.69	0.854	68.14	2.68	Y 1/2	12 1/4
21.89	0.862	68.77	2.71	Z	12 1/2
22.10	0.870	69.43	2.73	Z +1/2	12 3/4
22.33	0.879	70.15	2.76	Z+1	13
22.60	0.890	71.00	2.80	Z+1.5	13.5
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	Z+3	-
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	Z+4.5	-
23.87	0.940	74.99	2.95	Z+5	-
24.27	0.956	76.25	3.00	Z+6	-