An example of measuring the diameter of a ring. The inside of this ring
is approximately 18mm in diameter, making it a size 7 on the chart below.
Ring
Size |
Diameter
(in mm) |
4 |
16
mm |
5 |
17
mm |
6 |
17.5
mm |
7 |
18
mm |
8 |
19
mm |
9 |
20
mm |
10 |
21
mm |
11 |
21.5
mm |
12 |
22.5
mm |
13 |
23
mm |
14 |
24
mm |