You can refer to the international Ring Size Table below to find out your ring size based on the inside diameter and circumference of each ring size.
Please note that this is a general guide. We recommend having your finger precisely measured by a professional local jeweler with the appropriate tools confirming the required size as this is the most accurate way to find out your ring size.

Inside Diameter mm	Inside Circumference mm	British & Australian	US & Canada	Israel & Europe
14.25	44.77	F 3/4	3 1/4	45
14.36	45.11	G	3 3/8	45
14.45	45.4	G 1/4	3 1/2	45.5
14.56	45.74	G 1/2	3 5/8	46
14.65	46.02	H	3 3/4	46
14.86	46.68	H 1/2	4	46.5
15.04	47.25	I	4 1/4	47.5
15.27	47.97	I 1/2	4 1/2	48
15.4	48.38	J	4 5/8	48.5
15.53	48.79	J 1/4	4 3/4	49
15.7	49.32	J 1/2	5	49.5
15.8	49.64	K	5 1/8	49.5
15.9	49.95	K 1/4	5 1/4	50
16	50.27	K 1/2	5 3/8	50
16.1	50.58	L	5 1/2	50.5
16.3	51.21	L 1/4	5 3/4	51
16.41	51.55	L 1/2	5 7/8	51.5
16.51	51.87	M	6	52
16.71	52.5	M 1/2	6 1/4	52.5
16.92	53.16	N	6 1/2	53
17.13	53.82	N 1/2	6 3/4	54
17.35	54.51	O	7	54.5
17.45	54.82	O 1/2	7 1/4	55
17.75	55.76	P	7 1/2	56
17.97	56.45	P 1/2	7 3/4	56.5
18.19	57.15	Q	8	57
18.35	57.65	Q 1/2	8 1/4	57.5
18.53	58.21	Q 3/4	8 1/2	58
18.61	58.47	R	8 5/8	58.5
18.69	58.72	R 1/4	8 3/4	58.5
18.8	59.06	R 1/2	8 7/8	59
18.89	59.34	R 3/4	9	59.5
19.1	60	S	9 1/8	60
19.22	60.38	S 1/4	9 1/4	60.5
19.31	60.66	S 1/2	9 3/8	60.5
19.41	60.98	S 3/4	9 1/2	61
19.51	61.29	T	9 5/8	61.5
19.62	61.64	T 1/4	9 3/4	61.5
19.84	62.33	T 1/2	10	62.5
20.02	62.89	U	10 1/4	63
20.2	63.46	U 1/2	10 1/2	63.5
20.32	63.84	V	10 5/8	64
20.44	64.21	V 1/4	10 3/4	64.5
20.68	64.97	V 1/2	11	65
20.76	65.22	W	11 1/8	65
20.85	65.5	W 1/4	11 1/4	65.5
20.94	65.78	W 1/2	11 3/8	66
21.08	66.22	W 3/4	11 1/2	66
21.18	66.54	X	11 5/8	66.5
21.24	66.73	X 1/4	11 3/4	67
21.3	66.92	X 1/2	11 7/8	67
21.49	67.51	Y	12	67.5
21.69	68.14	Y 1/2	12 1/4	68
21.89	68.77	Z	12 1/2	69
22.1	69.43	Z +1/2	12 3/4	69.5
22.33	70.15	Z+1	13	70
22.6	71	Z+1.5	13.5	71
22.69	71.28	Z+2	13.5	71.5
22.92	72	Z+2.5	14	72
23.06	72.45	Z+3	14	72.5
23.24	73.01	Z+3.5	14 1/4	73
23.47	73.73	Z+4	14 1/3	73.5
23.55	73.98	Z+4.5	14 1/2	74
23.87	74.99	Z+5	15	75