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Ring Size
ID (Inch) |
ID(mm) |
Inner circumference (Inch) |
Inner circumference (mm) |
USA&Canada size(standard) |
New Zealand, Britain, Ireland, Australia |
Japen |
Switzerland |
0.586 |
14.9 |
1.84 |
46.7 |
4 |
H |
7 |
|
0.594 |
15.1 |
1.865 |
47.4 |
4 1/4 |
H 1/2 |
|
7.75 |
0.602 |
15.3 |
1.89 |
48 |
4 1/2 |
I |
8 |
|
0.61 |
15.5 |
1.915 |
48.7 |
4 3/4 |
J |
|
9 |
0.618 |
15.7 |
1.941 |
49.3 |
5 |
J 1/2 |
9 |
|
0.626 |
15.9 |
1.966 |
49.9 |
5 1/4 |
K |
|
10 |
0.634 |
16.1 |
1.991 |
50.6 |
5 1/2 |
K 1/2 |
10 |
|
0.642 |
16.3 |
2.016 |
51.2 |
5 3/4 |
L |
|
11.75 |
0.65 |
16.5 |
2.041 |
51.8 |
6 |
L 1/2 |
11 |
12.75 |
0.658 |
16.7 |
2.066 |
52.5 |
6 1/4 |
M |
12 |
|
0.666 |
16.9 |
2.091 |
53.1 |
6 1/2 |
M 1/2 |
13 |
14 |
0.674 |
17.1 |
2.116 |
53.8 |
6 3/4 |
N |
|
|
0.682 |
17.3 |
2.141 |
54.4 |
7 |
N 1/2 |
14 |
15.25 |
0.69 |
17.5 |
2.167 |
55 |
7 1/4 |
O |
|
|
0.698 |
17.7 |
2.192 |
55.7 |
7 1/2 |
O 1/2 |
15 |
16.5 |
0.706 |
17.9 |
2.217 |
56.3 |
7 3/4 |
P |
|
|
0.714 |
18.1 |
2.242 |
56.9 |
8 |
P 1/2 |
16 |
17.75 |
0.722 |
18.3 |
2.267 |
57.6 |
8 1/4 |
Q |
|
|
0.73 |
18.5 |
2.292 |
58.2 |
8 1/2 |
Q 1/2 |
17 |
|
0.738 |
18.7 |
2.317 |
58.9 |
8 3/4 |
R |
|
19 |
0.746 |
18.9 |
2.342 |
59.5 |
9 |
R 1/2 |
18 |
|
0.754 |
19.2 |
2.368 |
60.1 |
9 1/4 |
S |
|
20.25 |
0.762 |
19.4 |
2.393 |
60.8 |
9 1/2 |
S 1/2 |
19 |
|
0.77 |
19.6 |
2.418 |
61.4 |
9 3/4 |
T |
|
21.5 |
0.778 |
19.8 |
2.443 |
62.1 |
10 |
T 1/2 |
20 |
|
0.786 |
20 |
2.468 |
62.7 |
10 1/4 |
U |
21 |
|
0.794 |
20.2 |
2.493 |
63.3 |
10 1/2 |
U 1/2 |
22 |
22.75 |
0.802 |
20.4 |
2.518 |
64 |
10 3/4 |
V |
|
|
0.81 |
20.6 |
2.543 |
64.6 |
11 |
V 1/2 |
23 |
|
0.818 |
20.8 |
2.569 |
65.2 |
11 1/4 |
W |
|
25 |
0.826 |
21 |
2.594 |
65.9 |
11 1/2 |
W 1/2 |
24 |
|
0.834 |
21.2 |
2.619 |
66.5 |
11 3/4 |
X |
|
|
0.842 |
21.4 |
2.644 |
67.2 |
12 |
X 1/2 |
25 |
27.5 |
0.85 |
21.6 |
2.669 |
67.8 |
12 1/4 |
Y |
|
|
0.858 |
21.8 |
2.694 |
68.4 |
12 1/2 |
Z |
26 |
28.75 |
0.866 |
22 |
2.719 |
69.1 |
12 3/4 |
Z 1/2 |
|
|
0.874 |
22.2 |
2.744 |
69.7 |
13 |
|
27 |
|
0.882 |
22.4 |
2.769 |
70.3 |
13 1/4 |
Z1 |
|
|
0.89 |
22.6 |
2.795 |
71 |
13 1/2 |
|
|
|
0.898 |
22.8 |
2.82 |
71.6 |
13 3/4 |
Z2 |
|
|
0.906 |
23 |
2.845 |
72.3 |
14 |
Z3 |
|
|
0.914 |
23.2 |
2.87 |
72.9 |
14 1/4 |
|
|
|
0.922 |
23.4 |
2.895 |
73.5 |
14 1/2 |
Z4 |
|
|
0.93 |
23.6 |
2.92 |
74.2 |
14 3/4 |
|
|
|
0.938 |
23.8 |
2.945 |
74.8 |
15 |
|
|
|
0.946 |
24 |
2.97 |
75.4 |
15 1/4 |
|
|
|
0.954 |
24.2 |
2.996 |
76.1 |
15 1/2 |
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