International Ring Finger Sizes

Different Size Wedding Rings

Ring Sizing Advice

Britain	Europe	Japan	USA	Diameter	Circumference
			0	11.54	36.25
A				11.90	37.38
		0		12.00	37.70
A1/2				12.10	38.01
B				12.30	38.64
			1	12.37	38.86
B1/2				12.50	39.27
			11/4	12.58	39.52
C				12.70	39.90
	0.15		11/2	12.78	40.15
C1/2	0.53			12.90	40.53
	0.84	1	13/4	13.00	40.84
	1.00			13.05	41.00

Britain	Europe	Japan	USA	Diameter	Circumference
D	1.15			13.10	41.15
	1.50		2	13.21	41.50
D1/2	1.78			13.30	41.78
	1.88	2		13.33	41.88
	2.00			13.37	42.00
	2.13		21/4	13.41	42.13
E	2.41			13.50	42.41
	2.76		21/2	13.61	42.76
	2.91	3		13.66	42.91
E1/2	3.00			13.69	43.00
	3.42		23/4	13.82	43.42
F	3.67			13.90	43.67
	3.98	4		14.00	43.98
	4.00			14.01	44.00
	4.14		3	14.05	44.14

Britain	Europe	Japan	USA	Diameter	Circumference
F1/2	4.30			14.10	44.30
	4.74		31/4	14.24	44.74
G	4.92			14.30	44.92
	5.00			14.32	45.00
	5.02	5		14.33	45.02
	5.40		31/2	14.45	45.40
G1/2	5.55			14.50	45.55
	6.00			14.64	46.00
	6.02		33/4	14.65	46.02
	6.06	6		14.66	46.06
H	6.18			14.70	46.18
	6.68		4	14.86	46.68

Britain	Europe	Japan	USA	Diameter	Circumference
H1/2	6.81			14.90	46.81
	7.00			14.96	47.00
	7.12	7		15.00	47.12
	7.34		41/4	15.07	47.34
I	7.44			15.10	47.44
	7.97		41/2	15.27	47.97
	8.00			15.28	48.00
I1/2	8.07			15.30	48.07
	8.16	8		15.33	48.16
	8.63		43/4	15.48	48.63
J	8.69			15.50	48.69
	9.00			15.60	49.00
	9.20	9		15.66	49.20

Britain	Europe	Japan	USA	Diameter	Circumference
J1/2	9.32		5	15.70	49.32
K	9.95		51/4	15.90	49.95
	10.00			15.92	50.00
	10.27	10		16.00	50.27
K1/2	10.58		51/2	16.10	50.58
	11.00			16.23	51.00
L	11.24		53/4	16.31	51.24
	11.30	11		16.33	51.30
L1/2	11.87		6	16.51	51.87
	12.00			16.55	52.00
	12.34	12		16.66	52.34
M	12.46			16.70	52.46
	12.56		61/4	16.73	52.56
	13.00			16.87	53.00

Britain	Europe	Japan	USA	Diameter	Circumference
M1/2	13.09			16.90	53.09
	13.16		61/2	16.92	53.16
	13.41	13		17.00	53.41
N	13.72			17.10	53.72
	13.85		63/4	17.14	53.85
	14.00			17.19	54.00
N1/2	14.35			17.30	54.35
	14.44	14		17.33	54.44
	14.51		7	17.35	54.51
O	14.98			17.50	54.98
	15.00		71/4	17.56	55.00
	15.48	15		17.66	55.48

Britain	Europe	Japan	USA	Diameter	Circumference
O1/2	15.61			17.70	55.61
	15.76		71/2	173/4	55.76
	16.00			17.83	56.00
P	16.23			17.90	56.23
	16.45		73/4	17.97	56.45
	16.55	16		18.00	56.55
P1/2	16.86			18.10	56.86
	17.00			18.14	57.00
	17.15		8	18.19	57.15
Q	17.49			18.30	57.49
	17.59	17		18.33	57.59
	17.77		81/4	18.39	57.77
	18.00			18.46	58.00

Britain	Europe	Japan	USA	Diameter	Circumference
Q1/2	18.12			18.50	58.12
	18.40		81/2	18.59	58.40
	18.62	18		18.66	58.62
R	183/4			18.70	583/4
	19.00		83/4	18.78	59.00
R1/2	19.38			18.90	59.38
	19.66		9	18.99	59.66
	19.69	19		19.00	59.69
S	20.00			19.10	60.00
	20.38		91/4	19.22	60.38
S1/2	20.63			19.30	60.63
	20.73	20		19.33	60.73
	20.98		91/2	19.41	60.98
	21.00			19.42	61.00

Britain	Europe	Japan	USA	Diameter	Circumference
T	21.26			19.50	61.26
	21.67		93/4	19.63	61.67
	21.76	21		19.66	61.76
T1/2	21.89			19.70	61.89
	22.00			19.74	62.00
	22.33		10	19.84	62.33
U	22.52			19.90	62.52
	22.83	22		20.00	62.83
	23.00		101/4	20.05	63.00
U1/2	23.15			20.10	63.15
	23.59		101/2	20.24	63.59

Britain	Europe	Japan	USA	Diameter	Circumference
V	23.77			20.30	63.77
	23.87	23		20.33	63.87
	23.99			20.37	63.99
	24.28		103/4	20.46	64.28
V1/2	24.40			20.50	64.40
	24.91	24		20.66	64.91
	24.97		11	20.68	64.97
W	25.00			20.69	65.00
	25.60		111/4	20.88	65.60

Britain	Europe	Japan	USA	Diameter	Circumference
W1/2	25.66			20.90	65.66
	25.97	25		21.00	65.97
	26.00			21.01	66.00
	26.22		111/2	21.08	66.22
X	26.29			21.10	66.29
X1/2	26.92		113/4	21.30	66.92
	27.01	26		21.33	67.01
Y	27.51		12	21.49	67.51
	28.02			21.65	68.02
	28.05	27		21.66	68.05
Y1/2	28.20		121/4	21.71	68.20
Z	28.77		121/2	21.89	68.77
	28.99			21.96	68.99
	29.12	28		22.00	69.12

Britain	Europe	Japan	USA	Diameter	Circumference
Z1/2	29.43			22.10	69.43
	29.49		123/4	22.12	69.49
Z+1	29.99			22.28	69.99
	30.15	29	13	22.33	70.15
Z+11/2	30.69			22.50	70.69
	30.81		131/4	22.54	70.81
	31.00			22.60	71.00
	31.19	30		22.66	71.19
Z+2	31.31			22.70	71.31
	31.47		131/2	223/4	71.47
Z+21/2	32.01		133/4	22.92	72.01
	32.26	31		23.00	72.26

Britain	Europe	Japan	USA	Diameter	Circumference
Z+3	32.57			23.10	72.57
	32.76		14	23.16	72.76
	33.01			23.24	73.01
Z+31/2	33.20			23.30	73.20
	33.32			23.34	73.32
	33.29	32		23.33	73.29
	33.42		141/4	23.37	73.42
Z+4	33.83			23.50	73.83
	33.98		141/2	23.55	73.98
	34.33	33		23.66	74.33
Z+41/2	34.46			23.70	74.46
	34.71		143/4	23.78	74.71
	34.99			23.87	74.99

Britain	Europe	Japan	USA	Diameter	Circumference
Z+5	35.08			23.90	75.08
	35.40	34	15	24.00	75.40
Z+51/2	35.71			24.10	75.71
	36.00		151/4	24.19	76.00
Z+6	36.34			24.30	76.34
	36.43	35		24.33	76.43
	36.69		151/2	24.41	76.69
Z+61/2	37.00			24.51	77.00
	37.31		153/4	24.61	77.31
	37.47	36		24.66	77.47
Z+7	37.60			24.70	77.60
	38.00		16	24.83	78.00
Z+71/2	38.23			24.90	78.23
	38.54	37	161/4	25.00	78.54

You may also wish to refer to our Ring Sizing Advice page.

© Lawrence Chard 1999
Other jewellers are welcome to use this chart.
You may ask to copy this chart provided you agree to attach an acknowledgment and copyright notice to your copy.

Formulae:-
Diameter = (British Size x .4) + 11.5; where A = 1, B = 2, Z = 26, etc.
Diameter = (American Size x 0.83) + 11.5
European Size = Circumference - 40
Diameter = (Japanese Size / 3) +12.67
In all cases, diameter is in millimetres.

Diamond Ring Collet & Setting Styles