Ring size guide.
If you already know your size, refer to the chart below for guidance:
Circumference (mm)
44.2
45.5
46.8
48.0
49.3
50.6
51.8
53.1
54.4
55.7
56.9
58.2
59.4
60.7
62.0
63.3
64.5
65.8
67.1
68.3
69.6
US Size
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
13
Diameter (mm)
14.1
14.5
14.9
15.3
15.7
16.1
16.5
16.9
17.3
17.7
18.1
18.5
19.0
19.4
19.8
20.2
20.6
21.0
21.4
21.8
22.2