| Inside Diameter (mm) |
Circumference (mm) |
Ring Size |
| 11.63 |
36.50 |
0 |
| 11.84 |
37.20 |
1/4 |
| 12.04 |
37.80 |
1/2 |
| 12.24 |
38.50 |
3/4 |
| 12.45 |
39.10 |
1 |
| 12.65 |
39.70 |
1 1/4 |
| 12.85 |
40.40 |
1 1/2 |
| 13.06 |
41.00 |
1 3/4 |
| 13.26 |
41.70 |
2 |
| 13.46 |
42.30 |
2 1/4 |
| 13.67 |
42.90 |
2 1/2 |
| 13.87 |
43.60 |
2 3/4 |
| 14.07 |
44.20 |
3 |
| 14.27 |
44.80 |
3 1/4 |
| 14.48 |
45.50 |
3 1/2 |
| 14.68 |
46.10 |
3 3/4 |
| 14.88 |
46.80 |
4 |
| 15.09 |
47.40 |
4 1/4 |
| 15.29 |
48.00 |
4 1/2 |
| 15.49 |
48.70 |
4 3/4 |
| 15.70 |
49.30 |
5 |
| 15.90 |
50.00 |
5 1/4 |
| 16.10 |
50.60 |
5 1/2 |
| 16.31 |
51.20 |
5 3/4 |
| 16.51 |
51.90 |
6 |
| 16.71 |
52.50 |
6 1/4 |
| 16.92 |
53.10 |
6 1/2 |
| 17.12 |
53.80 |
6 3/4 |
| 17.32 |
54.40 |
7 |
| 17.53 |
55.10 |
7 1/4 |
| 17.73 |
55.70 |
7 1/2 |
| 17.93 |
56.30 |
7 3/4 |
| 18.14 |
57.00 |
8 |
| 18.34 |
57.60 |
8 1/4 |
| 18.54 |
58.30 |
8 1/2 |
| 18.75 |
58.90 |
8 3/4 |
| 18.95 |
59.50 |
9 |
| 19.15 |
60.20 |
9 1/4 |
| 19.35 |
60.80 |
9 1/2 |
| 19.56 |
61.40 |
9 3/4 |
| 19.76 |
62.10 |
10 |
| 19.96 |
62.70 |
10 1/4 |
| 20.17 |
63.40 |
10 1/2 |
| 20.37 |
64.00 |
10 3/4 |
| 20.57 |
64.60 |
11 |
| 20.78 |
65.30 |
11 1/4 |
| 20.98 |
65.90 |
11 1/2 |
| 21.18 |
66.60 |
11 3/4 |
| 21.39 |
67.20 |
12 |
| 21.59 |
67.80 |
12 1/4 |
| 21.79 |
68.50 |
12 1/2 |
| 22.00 |
69.10 |
12 3/4 |
| 22.20 |
69.70 |
13 |
| 22.40 |
70.40 |
13 1/4 |
| 22.61 |
71.00 |
13 1/2 |
| 22.81 |
71.70 |
13 3/4 |
| 23.01 |
72.30 |
14 |
| 23.22 |
72.90 |
14 1/4 |
| 23.42 |
73.60 |
14 1/2 |
| 23.62 |
74.20 |
14 3/4 |
| 23.83 |
74.80 |
15 |
| 24.03 |
75.50 |
15 1/4 |
| 24.23 |
76.10 |
15 1/2 |
| 24.43 |
76.80 |
15 3/4 |
| 24.64 |
77.40 |
16 |
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