Ring Size Chart

Circumference (inches)
Circumference (mm)
Diameter (mm)
U.S.A. size
Australian/UK Size
1  7/8
48
15.27
4 1/2
I – 1/2
1 15/16
49
15.7
5
J 1/2
2
51
16.1
5 1/2
L
2  1/16
52
16.51
6
M
2  1/8
53
16.92
6 1/2
N
2  3/16
55
17.35
7
O
2  1/4
56
17.75
7 1/2
P
2  5/16
57
18.19
8
Q
2  3/8
58
18.53
8 1/2
Q 1/2
2  7/16
59
18.89
9
R 1/2
2  1/2
61
19.41
9 1/2
S 1/2
2  9/16
62
19.84
10
T 1/2
2  5/8
63
20.2
10 1/2
U 1/2
2 11/16
65
20.68
11
V 1/2
2  3/4
66
21.08
11 1/2
W 1/2
2 13/16
68
21.49
12
Y
2  7/8
69
21.89
12 1/2
Z
2 15/16
70
22.33
13

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