Ring Size

Inside Diameter		Inside Circumference		Sizes
Inches	mm	Inches	mm	US & Canada	UK, Ireland & Australia	China & Japan	Switzerland
0.459	11.63	1.44	36.5	0	—	—	—
0.466	11.84	1.46	37.2	¼	—	—	—
0.474	12.04	1.49	37.8	½	A	—	—
0.482	12.24	1.51	38.5	¾	A½	—	—
0.49	12.45	1.54	39.1	1	B	1	—
0.498	12.65	1.56	39.7	1¼	B½	—	—
0.506	12.85	1.59	40.4	1½	C	—	—
0.514	13.06	1.61	41	1¾	C½	—	—
0.522	13.26	1.64	41.7	2	D	2	1.5
0.53	13.46	1.67	42.3	2¼	D½	—	—
0.538	13.67	1.69	42.9	2½	E	3	2.75
0.546	13.87	1.72	43.6	2¾	E½	—	—
0.554	14.07	1.74	44.2	3	F	4	4
0.562	14.27	1.77	44.8	3¼	F½	5	5.25
0.57	14.48	1.79	45.5	3½	G	—	—
0.578	14.68	1.82	46.1	3¾	G½	6	6.5
0.586	14.88	1.84	46.8	4	H	7	—
0.594	15.09	1.87	47.4	4¼	H½	—	7.75
0.602	15.29	1.89	48	4½	I	8	—
0.61	15.49	1.92	48.7	4¾	J	—	9
0.618	15.7	1.94	49.3	5	J½	9	—
0.626	15.9	1.97	50	5¼	K	—	10
0.634	16.1	1.99	50.6	5½	K½	10	—
0.642	16.31	2.02	51.2	5¾	L	—	11.75
0.65	16.51	2.04	51.9	6	L½	11	12.75
0.658	16.71	2.07	52.5	6¼	M	12	—
0.666	16.92	2.09	53.1	6½	M½	13	14
0.674	17.12	2.12	53.8	6¾	N	—	—
0.682	17.32	2.14	54.4	7	N½	14	15.25
0.69	17.53	2.17	55.1	7¼	O	—	—
0.698	17.73	2.19	55.7	7½	O½	15	16.5
0.706	17.93	2.22	56.3	7¾	P	—	—
0.714	18.14	2.24	57	8	P½	16	17.75
0.722	18.34	2.27	57.6	8¼	Q	—	—
0.73	18.54	2.29	58.3	8½	Q½	17	—
0.738	18.75	2.32	58.9	8¾	R	—	19
0.746	18.95	2.34	59.5	9	R½	18	—
0.754	19.15	2.37	60.2	9¼	S	—	20.25
0.762	19.35	2.39	60.8	9½	S½	19	—
0.77	19.56	2.42	61.4	9¾	T	—	21.5
0.778	19.76	2.44	62.1	10	T½	20	—
0.786	19.96	2.47	62.7	10¼	U	21	—
0.794	20.17	2.49	63.4	10½	U½	22	22.75
0.802	20.37	2.52	64	10¾	V	—	—
0.81	20.57	2.54	64.6	11	V½	23	—
0.818	20.78	2.57	65.3	11¼	W	—	25
0.826	20.98	2.59	65.9	11½	W½	24	—
0.834	21.18	2.62	66.6	11¾	X	—	—
0.842	21.39	2.65	67.2	12	X½	25	27.5
0.85	21.59	2.67	67.8	12¼	Y	—	—
0.858	21.79	2.7	68.5	12½	Z	26	28.75
0.866	22	2.72	69.1	12¾	Z½	—	—
0.874	22.2	2.75	69.7	13	—	27	—
0.882	22.4	2.77	70.4	13¼	Z1	—	—
0.89	22.61	2.8	71	13½	—	—	—
0.898	22.81	2.82	71.7	13¾	Z2	—	—
0.906	23.01	2.85	72.3	14	Z3	—	—
0.914	23.22	2.87	72.9	14¼	—	—	—
0.922	23.42	2.9	73.6	14½	Z4	—	—
0.93	23.62	2.92	74.2	14¾	—	—	—
0.938	23.83	2.95	74.8	15	—	—	—
0.946	24.03	2.97	75.5	15¼	—	—	—
0.954	24.23	3	76.1	15½	—	—	—
0.962	24.43	3.02	76.8	15¾	—	—	—
0.97	24.64	3.05	77.4	16	—	—	—

Inside Diameter		Inside Circumference		Sizes
Inches	mm	Inches	mm	China & Japan	Switzerland
0.459	11.63	1.44	36.5	—	—
0.466	11.84	1.46	37.2	—	—
0.474	12.04	1.49	37.8	—	—
0.482	12.24	1.51	38.5	—	—
0.49	12.45	1.54	39.1	1	—
0.498	12.65	1.56	39.7	—	—
0.506	12.85	1.59	40.4	—	—
0.514	13.06	1.61	41	—	—
0.522	13.26	1.64	41.7	2	1.5
0.53	13.46	1.67	42.3	—	—
0.538	13.67	1.69	42.9	3	2.75
0.546	13.87	1.72	43.6	—	—
0.554	14.07	1.74	44.2	4	4
0.562	14.27	1.77	44.8	5	5.25
0.57	14.48	1.79	45.5	—	—
0.578	14.68	1.82	46.1	6	6.5
0.586	14.88	1.84	46.8	7	—
0.594	15.09	1.87	47.4	—	7.75
0.602	15.29	1.89	48	8	—
0.61	15.49	1.92	48.7	—	9
0.618	15.7	1.94	49.3	9	—
0.626	15.9	1.97	50	—	10
0.634	16.1	1.99	50.6	10	—
0.642	16.31	2.02	51.2	—	11.75
0.65	16.51	2.04	51.9	11	12.75
0.658	16.71	2.07	52.5	12	—
0.666	16.92	2.09	53.1	13	14
0.674	17.12	2.12	53.8	—	—
0.682	17.32	2.14	54.4	14	15.25
0.69	17.53	2.17	55.1	—	—
0.698	17.73	2.19	55.7	15	16.5
0.706	17.93	2.22	56.3	—	—
0.714	18.14	2.24	57	16	17.75
0.722	18.34	2.27	57.6	—	—
0.73	18.54	2.29	58.3	17	—
0.738	18.75	2.32	58.9	—	19
0.746	18.95	2.34	59.5	18	—
0.754	19.15	2.37	60.2	—	20.25
0.762	19.35	2.39	60.8	19	—
0.77	19.56	2.42	61.4	—	21.5
0.778	19.76	2.44	62.1	20	—
0.786	19.96	2.47	62.7	21	—
0.794	20.17	2.49	63.4	22	22.75
0.802	20.37	2.52	64	—	—
0.81	20.57	2.54	64.6	23	—
0.818	20.78	2.57	65.3	—	25
0.826	20.98	2.59	65.9	24	—
0.834	21.18	2.62	66.6	—	—
0.842	21.39	2.65	67.2	25	27.5
0.85	21.59	2.67	67.8	—	—
0.858	21.79	2.7	68.5	26	28.75
0.866	22	2.72	69.1	—	—
0.874	22.2	2.75	69.7	27	—
0.882	22.4	2.77	70.4	—	—
0.89	22.61	2.8	71	—	—
0.898	22.81	2.82	71.7	—	—
0.906	23.01	2.85	72.3	—	—
0.914	23.22	2.87	72.9	—	—
0.922	23.42	2.9	73.6	—	—
0.93	23.62	2.92	74.2	—	—
0.938	23.83	2.95	74.8	—	—
0.946	24.03	2.97	75.5	—	—
0.954	24.23	3	76.1	—	—
0.962	24.43	3.02	76.8	—	—
0.97	24.64	3.05	77.4	—	—

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