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Conversion Chart For Ring Sizes

Conversion Chart For Ring Sizes
Inside Diameter
Inside Circumference
Sizes
(IN)
(MM)
(IN)
(MM)
United States Canada
United Kingdom Ireland Australia
Switzerland
0.458
11.63
1.44
36.5
0
  
  
0.466
11.84
1.46
37.2
1/4
  
  
0.474
12.04
1.49
37.8
1/2
A
  
0.482
12.24
1.51
38.5
3/4
A 1/2
  
0.49
12.45
1.54
39.1
1
B
  
0.498
12.65
1.56
39.7
1 1/4
B 1/2
  
0.506
12.85
1.59
40.4
1 1/2
C
  
0.514
13.06
1.61
41
1 3/4
C 1/2
  
0.522
13.26
1.64
41.7
2
D
1.5
0.53
13.46
1.67
42.3
2 1/4
D 1/2
  
0.538
13.67
1.69
42.9
2 1/2
E
2.75
0.546
13.87
1.72
43.6
2 3/4
E 1/2
  
0.554
14.07
1.74
44.2
3
F
4
0.562
14.27
1.77
44.8
3 1/4
F 1/2
5.25
0.57
14.48
1.79
45.5
3 1/2
G
  
0.578
14.68
1.82
46.1
3 3/4
G 1/2
6.5
0.586
14.88
1.84
46.8
4
H
  
0.594
15.09
1.87
47.4
4 1/4
H 1/2
7.75
0.602
15.29
1.89
48
4 1/2
I
  
0.61
15.49
1.92
48.7
4 3/4
J
9
0.618
15.7
1.94
49.3
5
J 1/2
  
0.626
15.9
1.97
50
5 1/4
K
10
0.634
16.1
1.99
50.6
5 1/2
K 1/2
  
0.642
16.31
2.02
51.2
5 3/4
L
11.75
0.65
16.51
2.04
51.9
6
L 1/2
12.75
0.658
16.71
2.07
52.5
6 1/4
M
  
0.666
16.92
2.09
53.1
6 1/2
M 1/2
14
0.674
17.12
2.12
53.8
6 3/4
N
  
0.682
17.32
2.14
54.4
7
N 1/2
15.25
0.69
17.53
2.17
55.1
7 1/4
O
  
0.698
17.73
2.19
55.7
7 1/2
O 1/2
16.5
0.706
17.93
2.22
56.3
7 3/4
P
  
0.714
18.14
2.24
57
8
P 1/2
17.75
0.722
18.34
2.27
57.6
8 1/4
Q
  
0.73
18.54
2.29
58.3
8 1/2
Q 1/2
  
0.738
18.75
2.32
58.9
8 3/4
R
19
0.746
18.95
2.34
59.5
9
R 1/2
  
0.754
19.15
2.37
60.2
9 1/4
S
20.25
0.762
19.35
2.39
60.8
9 1/2
S 1/2
  
0.77
19.56
2.42
61.4
9 3/4
T
21.5
0.778
19.76
2.44
62.1
10
T 1/2
  
0.786
19.96
2.47
62.7
10 1/4
U
  
0.794
20.17
2.49
63.4
10 1/2
U 1/2
22.75
0.802
20.37
2.52
64
10 3/4
V
  
0.81
20.57
2.54
64.6
11
V 1/2
  
0.818
20.78
2.57
65.3
11 1/4
W
25
0.826
20.98
2.59
65.9
11 1/2
W 1/2
  
0.834
21.18
2.62
66.6
11 3/4
X
  
0.842
21.39
2.65
67.2
12
X 1/2
27.5
0.85
21.59
2.67
67.8
12 1/4
Y
  
0.858
21.79
2.7
68.5
12 1/2
Z
28.75
0.866
22
2.72
69.1
12 3/4
Z 1/2
  
0.874
22.2
2.75
69.7
13
  
  
0.882
22.4
2.77
70.4
13 1/4
Z1
  
0.89
22.61
2.8
71
13 1/2
  
  
0.898
22.81
2.82
71.7
13 3/4
Z2
  
0.906
23.01
2.85
72.3
14
Z3
  
0.914
23.22
2.87
72.9
14 1/4
  
  
0.922
23.42
2.9
73.6
14 1/2
Z4
  
0.93
23.62
2.92
74.2
14 3/4
  
  
0.938
23.83
2.95
74.8
15
  
  
0.946
24.03
2.97
75.5
15 1/4
  
  
0.954
24.23
3
76.1
15 1/2
  
  
0.962
24.43
3.02
76.8
15 3/4
  
  
0.97
24.64
3.05
77.4
16