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Ring Sizing

Size
Inside Diameter (mm)
Inside Circumference (mm)
1
12.5
39.3
1.5
12.9
40.5
2
13.3
41.8
2 1/2
13.8
43.4
3
14.2
44.6
3 1/2
14.6
45.9
4
15
47.1
4 1/2
15.4
48.4
5
15.8
49.6
5 1/2
16.2
50.9
6
16.6
52.2
6 1/2
17
53.4
7
17.4
54.7
7 1/2
17.9
56.2
8
18.3
57.5
8 1/2
18.7
58.7
9
19.1
60
9 1/2
19.5
61.3
10
19.9
62.5
10 1/2
20.3
63.8
11
20.7
65
11 1/2
21.1
66.3
12
21.5
67.5
12 1/2
21.9
68.8
13
22.3
70.1
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