Ring Sizes

UK
US
EU
Circumference
Inside Diameter
J
5
49
15.6
K
5.5
51
16.2
L
6
52
16.6
M
6.5
53
16.9
N
7
54
17.2
O
7.5
56
17.8
P
8
57
18.1
Q
8.5
58
18.5
R
9
60
19.1
S
9.5
61
19.4
T
10
62
19.7
U
10.5
64
20.4
V
11
65
20.7
W
11.5
66
21.0
X
12
68
21.6
Y
12.5
69
22.0
Z
13
70
22.3
Z2
13.5
72
22.9
Z3
14
73
23.2