How to measure the size of a ring

Inside Circumference
|
Sizes
|
||||
MM
|
Inches
|
Australian & British
|
US & Canada
|
French & Russian
|
Swiss
|
54.51
|
2.15
|
O
|
7
|
55 1/4
|
15 1/4
|
54.82
|
2.16
|
O 1/2
|
7 1/4
|
-
|
-
|
55.76
|
2.20
|
P
|
7 1/2
|
56 1/2
|
16 1/2
|
56.45
|
2.22
|
P 1/2
|
7 3/4
|
-
|
-
|
57.15
|
2.25
|
Q
|
8
|
57 3/4
|
17 3/4
|
57.65
|
2.27
|
Q 1/2
|
8 1/4
|
-
|
-
|
58.21
|
2.29
|
Q 3/4
|
8 1/2
|
-
|
-
|
58.47
|
2.30
|
R
|
8 5/8
|
59
|
19
|
58.72
|
2.31
|
R 1/4
|
8 3/4
|
-
|
-
|
59.06
|
2.32
|
R 1/2
|
8 7/8
|
-
|
-
|
59.34
|
2.35
|
R 3/4
|
9
|
-
|
-
|
60.00
|
2.36
|
S
|
9 1/8
|
60 1/4
|
20 1/4
|
60.38
|
2.38
|
S 1/4
|
9 1/4
|
-
|
-
|
60.66
|
2.39
|
S 1/2
|
9 3/8
|
-
|
-
|
60.98
|
2.40
|
S 3/4
|
9 1/2
|
-
|
-
|
61.29
|
2.41
|
T
|
9 5/8
|
61 1/2
|
21 1/2
|
61.64
|
2.43
|
T 1/4
|
9 3/4
|
-
|
-
|
62.33
|
2.45
|
T 1/2
|
10
|
-
|
-
|
62.89
|
2.48
|
U
|
10 1/4
|
62 3/4
|
22 3/4
|
63.46
|
2.50
|
U 1/2
|
10 1/2
|
-
|
-
|
63.84
|
2.51
|
V
|
10 5/8
|
63
|
23 3/4
|
64.21
|
2.53
|
V 1/4
|
10 3/4
|
-
|
-
|
64.97
|
2.56
|
V 1/2
|
11
|
-
|
-
|
65.22
|
2.57
|
W
|
11 1/8
|
65
|
25
|
65.50
|
2.58
|
W 1/4
|
11 1/4
|
-
|
-
|
65.78
|
2.59
|
W 1/2
|
11 3/8
|
-
|
-
|
66.22
|
2.61
|
W 3/4
|
11 1/2
|
-
|
-
|
66.54
|
2.62
|
X
|
11 5/8
|
66 1/4
|
26 1/4
|
66.73
|
2.63
|
X 1/4
|
11 3/4
|
-
|
-
|
66.92
|
2.64
|
X 1/2
|
11 7/8
|
-
|
-
|
67.51
|
2.66
|
Y
|
12
|
67 1/2
|
27 1/2
|
68.14
|
2.68
|
Y 1/2
|
12 1/4
|
-
|
-
|
68.77
|
2.71
|
Z
|
12 1/2
|
68 3/4
|
28 3/4
|
69.43
|
2.73
|
Z +1/2
|
12 3/4
|
-
|
-
|
70.15
|
2.76
|
Z+1
|
13
|
-
|
-
|
71.00
|
2.80
|
Z+1.5
|
13.5
|
-
|
This guide applies to all Viking rings