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Ring Size Conversion Guide |
|
UK Size |
European Metric Size |
American Size |
Japan Size |
Inside Diameter |
Inner Circumference |
| |
|
|
|
Inches |
mm |
Inches |
|
G |
|
|
|
0.568 |
14.43 |
1.784 |
|
G½ |
|
|
|
0.576 |
14.63 |
1.809 |
| |
46 |
|
|
0.577 |
14.64 |
1.811 |
| |
|
|
6 |
0.577 |
14.66 |
1.813 |
| |
|
4 |
|
0.582 |
14.78 |
1.828 |
|
H |
|
|
|
0.584 |
14.82 |
1.794 |
| |
47 |
|
|
0.589 |
14.96 |
1.85 |
| |
|
|
7 |
0.591 |
15 |
1.855 |
|
H½ |
|
|
|
0.591 |
15.02 |
1.857 |
| |
|
4½ |
|
0.598 |
15.19 |
1.879 |
|
I |
|
|
|
0.599 |
15.22 |
1.882 |
| |
48 |
|
|
0.602 |
15.28 |
1.89 |
| |
|
|
8 |
0.604 |
15.33 |
1.896 |
|
I½ |
|
|
|
0.607 |
15.41 |
1.906 |
| |
49 |
5 |
|
0.614 |
15.6 |
1.929 |
|
J |
|
|
|
0.614 |
15.61 |
1.93 |
| |
|
|
9 |
0.617 |
15.66 |
1.937 |
|
J½ |
|
|
|
0.622 |
15.81 |
1.955 |
| |
50 |
|
|
0.627 |
15.92 |
1.969 |
|
K |
|
5½ |
10 |
0.63 |
16 |
1.979 |
|
K½ |
|
|
|
0.638 |
16.2 |
2.004 |
| |
51 |
|
|
0.639 |
16.23 |
2.008 |
| |
|
|
11 |
0.643 |
16.33 |
2.02 |
|
L |
|
6 |
|
0.646 |
16.4 |
2.028 |
| |
52 |
|
|
0.652 |
16.55 |
2.047 |
|
L½ |
|
|
|
0.653 |
16.59 |
2.052 |
| |
|
|
12 |
0.656 |
16.66 |
2.061 |
|
M |
|
|
|
0.661 |
16.79 |
2.076 |
| |
|
6½ |
|
0.662 |
16.82 |
2.08 |
| |
53 |
|
|
0.664 |
16.87 |
2.087 |
|
M½ |
|
|
13 |
0.669 |
16.99 |
2.101 |
|
N |
|
|
|
0.676 |
17.18 |
2.125 |
| |
54 |
|
|
0.677 |
17.19 |
2.126 |
| |
|
7 |
|
0.678 |
17.22 |
2.13 |
| |
|
|
14 |
0.682 |
17.33 |
2.143 |
|
N½ |
|
|
|
0.684 |
17.38 |
2.15 |
| |
55 |
|
|
0.689 |
17.51 |
2.165 |
|
O |
|
|
|
0.692 |
17.58 |
2.174 |
| |
|
7½ |
|
0.694 |
17.63 |
2.18 |
| |
|
|
15 |
0.695 |
17.66 |
2.184 |
|
O½ |
|
|
|
0.7 |
17.78 |
2.198 |
| |
56 |
|
|
0.702 |
17.83 |
2.205 |
|
P |
|
|
|
0.708 |
17.97 |
2.223 |
| |
|
8 |
16 |
0.71 |
18.03 |
2.23 |
| |
57 |
|
|
0.714 |
18.14 |
2.244 |
|
P½ |
|
|
|
0.715 |
18.17 |
2.247 |
| |
|
|
17 |
0.722 |
18.33 |
2.267 |
|
Q |
|
|
|
0.723 |
18.36 |
2.27 |
| |
|
8½ |
|
0.726 |
18.45 |
2.282 |
| |
58 |
|
|
0.727 |
18.46 |
2.283 |
|
Q½ |
|
|
|
0.731 |
18.56 |
2.296 |
| |
|
|
18 |
0.735 |
18.66 |
2.308 |
|
R |
|
|
|
0.739 |
18.76 |
2.32 |
| |
59 |
|
|
0.739 |
18.78 |
2.323 |
| |
|
9 |
|
0.743 |
18.87 |
2.334 |
|
R½ |
|
|
|
0.746 |
18.96 |
2.344 |
| |
|
|
19 |
0.748 |
19 |
2.35 |
| |
60 |
|
|
0.752 |
19.1 |
2.362 |
|
S |
|
|
|
0.754 |
19.15 |
2.369 |
| |
|
9½ |
|
0.759 |
19.28 |
2.384 |
| |
|
|
20 |
0.761 |
19.33 |
2.391 |
|
S½ |
|
|
|
0.762 |
19.35 |
2.393 |
| |
61 |
|
|
0.764 |
19.42 |
2.402 |
|
T |
|
|
|
0.769 |
19.55 |
2.417 |
| |
|
|
21 |
0.774 |
19.66 |
2.431 |
| |
62 |
|
|
0.777 |
19.74 |
2.441 |
|
T½ |
|
|
|
0.777 |
19.74 |
2.442 |
| |
|
10 |
|
0.778 |
19.76 |
2.444 |
|
U |
|
|
|
0.785 |
19.94 |
2.466 |
| |
|
|
22 |
0.787 |
20 |
2.474 |
| |
63 |
|
|
0.79 |
20.05 |
2.48 |
|
U½ |
|
|
|
0.793 |
20.14 |
2.491 |
| |
|
10½ |
|
0.794 |
20.17 |
2.494 |
|
V |
|
|
23 |
0.801 |
20.33 |
2.515 |
| |
64 |
|
|
0.802 |
20.37 |
2.52 |
|
V½ |
|
|
|
0.808 |
20.53 |
2.539 |
| |
|
11 |
|
0.811 |
20.6 |
2.548 |
|
|
| |
|
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