International Ring Size Conversion Chart

When it comes to determining the size of your ring, we highly recommend that you get your ring size measured by reputable jewelers until at least two agree on the same ring size. Be sure to check out the video on our How to: Get Your Custom Ring Sized Properly blog post. See our ring size conversion chart below to determine your ring size within your region.

New Column	New Column	New Column	New Column	New Column	New Column	New Column	New Column
US Size	Dia. (mm)	Circ.(mm)	British	French	German	Japanese	Swiss
0.500	11.94	37.52	A
0.625	12.05	37.85
0.750	12.15	38.18	A 1/2
0.875	12.26	38.50
1.000	12.36	38.83	B			1
1.125	12.46	39.15
1.250	12.57	39.48	B 1/2
1.375	12.67	39.80
1.500	12.77	40.13	C				0.5
1.625	12.88	40.45
1.750	12.98	40.78	C 1/2				1
1.875	13.08	41.10
2.000	13.19	41.43	D	41.50	13.50	2	1.75
2.125	13.29	41.76
2.250	13.39	42.08	D 1/2				2.25
2.375	13.50	42.41
2.500	13.60	42.73	E	42.75	13.75	3	3.00
2.625	13.71	43.06
2.750	13.81	43.38	E 1/2				3.5
2.875	13.91	43.71
3.000	14.02	44.03	F	44	14	4	4.25
3.125	14.12	44.36
3.250	14.22	44.68	F 1/2			5	4.75
3.375	14.33	45.01		45.25
3.500	14.43	45.34	G		14.50		5.5
3.625	14.53	45.66
3.750	14.64	45.99	G 1/2	46.50		6	6.00
3.875	14.74	46.31
4.000	14.85	46.64	H		15	7	6.75
4.125	14.95	46.96
4.250	15.05	47.29	H 1/2	47.75			7.50
4.375	15.16	47.61
4.500	15.26	47.94	I		15.25	8	8
4.625	15.36	48.26		49	15.50
4.750	15.47	48.59	J				8.75
4.875	15.57	48.92
5.000	15.67	49.24	J 1/2		15.75	9	9.25
5.125	15.78	49.57		50
5.250	15.88	49.89	K				10
5.375	15.98	50.22
5.500	16.09	50.54	K 1/2	51.75	16	10
5.625	16.19	50.87
5.750	16.30	51.19	L				11.25
5.875	16.40	51.52
6.000	16.50	51.85	L 1/2	52.75	16.50	11	11.75
6.125	16.61	52.17
6.250	16.71	52.50	M			12	12.5
6.375	16.81	52.82
6.500	16.92	53.15	M 1/2	54	17	13	13.25
6.625	17.02	53.47
6.750	17.12	53.80	N				13.75
6.875	17.23	54.12
7.000	17.33	54.45	N 1/2	55.25	17.25	14	14.50
7.125	17.44	54.77
7.250	17.54	55.10	O				15
7.375	17.64	55.43
7.500	17.75	55.75	O 1/2	56.50	17.75	15	15.75
7.625	17.85	56.08
7.750	17.95	56.40	P				16.25
7.875	18.06	56.73
8.000	18.16	57.05	P 1/2	57.75	18	16	17.00
8.125	18.26	57.38
8.250	18.37	57.70	Q				17.5
8.375	18.47	58.03
8.500	18.57	58.35	Q 1/2	58	18.50	17	18.25
8.625	18.68	58.68		59
8.750	18.78	59.01	R				19
8.875	18.89	59.33
9.000	18.99	59.66	R 1/2		19	18	19.5
9.125	19.09	59.98		60.25
9.250	19.20	60.31	S				20.25
9.375	19.30	60.63
9.500	19.40	60.96	S 1/2		19.50	19	20.75
9.625	19.51	61.28		61.50
9.750	19.61	61.61	T				21.50
9.875	19.71	61.93
10.000	19.82	62.26	T 1/2		20	20	22
10.125	19.92	62.59
10.250	20.03	62.91	U	62.75		21	22.75
10.375	20.13	63.24
10.500	20.23	63.56	U 1/2		20.25	22	23.25
10.625	20.34	63.89		63
10.750	20.44	64.21	V				24
10.875	20.54	64.54
11.000	20.65	64.86	V 1/2		20.75	23	24.75
11.125	20.75	65.19		65
11.250	20.85	65.51	W				25.25
11.375	20.96	65.84
11.500	21.06	66.17	W 1/2		21	24	26
11.625	21.16	66.49		66.25
11.750	21.27	66.82	X				26.5
11.875	21.37	67.14
12.000	21.48	67.47	X 1/2	67.50	21.25	25	27.25
12.125	21.58	67.79
12.250	21.68	68.12	Y				27.75
12.375	21.79	68.44
12.500	21.89	68.77	Z	68.75	21.75	26	28.50
12.625	21.99	69.09
12.750	22.10	69.42	Z 1/2				29
12.875	22.20	69.75
13.000	22.30	70.07			22	27	29.75
13.125	22.41	70.40
13.250	22.51	70.72	Z1				30.5
13.375	22.62	71.05
13.500	22.72	71.37					31
13.625	22.82	71.70
13.750	22.93	72.02	Z2				31.75
13.875	23.03	72.35
14.000	23.13	72.68	Z3				32.25
14.125	23.24	73.00
14.250	23.34	73.33					33
14.375	23.44	73.65
14.500	23.55	73.98	Z4				33.5
14.625	23.65	74.30
14.750	23.75	74.63					34.25
14.875	23.86	74.95
15.000	23.96	75.28					34.75
15.125	24.07	75.60
15.250	24.17	75.93					35.5
15.375	24.27	76.26
15.500	24.38	76.58					36.25
15.625	24.48	76.91
15.750	24.58	77.23					36.75
15.875	24.69	77.56
16.000	24.79	77.88					37.5
16.125	24.89	78.21
16.250	25.00	78.53
16.375	25.10	78.86
16.500	25.21	79.18
16.625	25.31	79.51
16.750	25.41	79.84
16.875	25.52	80.16
17.000	25.62	80.49
17.125	25.72	80.81
17.250	25.83	81.14
17.375	25.93	81.46
17.500	26.03	81.79
17.625	26.14	82.11
17.750	26.24	82.44
17.875	26.34	82.76
18.000	26.45	83.09
18.125	26.55	83.42
18.250	26.66	83.74
18.375	26.76	84.07
18.500	26.86	84.39
18.625	26.97	84.72
18.750	27.07	85.04
18.875	27.17	85.37
19.000	27.28	85.69
19.125	27.38	86.02
19.250	27.48	86.34
19.375	27.59	86.67
19.500	27.69	87.00
19.625	27.80	87.32
19.750	27.90	87.65
19.875	28.00	87.97
20.000	28.11	88.30