Ring Size Comparison Chart

BRITISH, IRISH, AUSTRALIAN	USA, CANADA	DIAMETER IN MM	DIAMETER IN INS	CIRCUMFERENCE (IN MM)	JAPAN	EUROPE
	0000	9.91	.390
	00	10.72	.422
	0	11.53	.454
A	1/2	11.95	.474	37.6
A 1/2	3/4	12.18	.482
B	1	12.37	.487	38.9	1
B 1/2	1 1/4	12.60
C	1 1/2	12.78	.503	40.2
C 1/2	1 3/4	13.00				.5
D	2	13.21	.520	41.5	2	1.2
D 1/2	2 1/4	13.41				1.8
E	2 1/2	13.61	.536	42.7	3	2.4
E 1/2	2 3/4	13.83				3.00
F	3	14.05	.553	43.4	4	3.7
F 1/2	3 1/8	14.15				4.3
	3 1/4	14.25
G	3 3/8	14.36			5	4.9
	3 1/2	14.45	.569
G 1/2	3 5/8	14.56			6	5.6
H	3/4	14.65
H 1/2	4	14.86	.585	46.5	7	6
I	4 1/4	15.04
I 1/2	4 1/2	15.27	.601	48	8	8
J	4 5/8	15.40
	4 3/4	15.53
J 1/2	5	15.70	.618	49	9	9
K	5 1/8	15.80
	4 1/4	15.90
K 1/2	5 3/8	16.00
L	5 1/2	16.10	.634	50.5	10	10
	5 3/4	16.30
L 7/8	5 7/8	16.41
M	6	16.51	.650	52	12	12
M 1/2	6 1/4	16.71
N	6 1/2	16.92	.666	53	13	13
N 1/2	6 3/4	17.13
O	7	17.35	.683	54.5	14	14
O 1/2	7 1/4	17.45
P	7 1/2	17.75	.699	55.5	15	15
P 1/2	7 3/4	17.97
Q	8	18.19	.716	57	16	17
Q 1/2	8 1/4	18.35		58	17	18
	8 1/2	18.53	.732
R	8 5/8	18.61
	8 3/4	18.69
R 1/2	8 7/8	18.80		59.5	18	19
	9	18.89	.748
S	9 1/8	19.10
	9 1/4	19.22
S 1/2	9 3/8	19.31		61	20	21
	9 1/2	19.41	.764
T	9 5/8	19.51
	9 3/4	19.62
T 1/2	10	19.84	.781	62	21	22
U	10 1/4	20.02
U 1/2	10 1/2	20.20	.797	63.5	22	23
V	10 5/8	20.32
	10 3/4	20.44
V 1/2	11	20.68	.814	64.5	23	24
W	11 1/8	20.76
	11 1/4	20.85
W 1/2	1 3/8	20.94		66	25	26
	11 1/2	21.08
X	11 5/8	21.18	.830
	11 3/4	21.24
X 1/2	11 7/8	21.30
Y	12	21.49	.846	67.5	26	27
Y 1/2	12 1/4	21.69
Z	12 1/2	21.89	.862	68.5	27	28
Z+1	13	22.2		70	28	30
Z+2	13 1/2	22.6		71	29	31
Z+3	14	23		72.5	31	32
Z+4	14 1/2	23.4		74	32	34
Z+5	15	23.9		75	33	35
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