Ring Size Chart

U & UK Size	US & Canada Size (Approx.)	Inside Circumference (Approx. mm)	Inside Diameter (Approx. mm)
A	1/2	37.54	11.95
B	1 1/8	38.86	12.37
C	1 1/2	40.15	12.78
D	2	41.50	13.21
E	2 1/2	42.76	13.61
F	3	44.14	14.05
F 1/2	3 1/8	44.45	14.15
G	3 1/2	45.11	14.36
G 1/2	3 5/8	45.74	14.56
H	4	46.02	14.65
H 1/2	4 1/8	46.68	14.86
I	4 3/8	47.25	15.04
I 1/2	4 5/8	47.97	15.27
J	4 7/8	48.38	15.40
J 1/2	5 1/8	49.32	15.70
K	5 3/8	49.64	15.80
K 1/2	5 5/8	50.27	16.00
L	5 7/8	50.58	16.10
L 1/2	6 1/8	51.55	16.41
M	6 3/8	51.87	16.51
M 1/2	6 5/8	52.50	16.71
N	6 7/8	53.16	16.92
N 1/2	7	53.82	17.13
O	7 3/8	54.51	17.35
O 1/2	7 1/2	54.82	17.45
P	7 3/4	55.76	17.75
P 1/2	8	56.45	17.97
Q	8 1/4	57.15	18.19
Q 1/2	8 1/2	57.65	18.35
R	8 3/4	58.47	18.61
R 1/2	9	59.06	18.8
S	9 1/4	60.00	19.10
S 1/2	9 1/2	60.66	19.31
T	9 3/4	61.29	19.51
T 1/2	10	62.33	19.84
U	10 1/4	62.89	20.02
U 1/2	10 1/2	63.46	20.20
V	10 3/4	63.84	20.32
V 1/2	11	64.97	20.68
W	11 1/4	65.22	20.76
W 1/2	11 1/2	65.78	20.94
X	11 3/4	66.54	21.18
X 1/2	12	66.92	21.30
Y	12 1/8	67.51	21.49
Y 1/2	12 1/2	68.14	21.69
Z	12 5/8	68.77	21.89