Diagram of a ring
  1. Use a ruler to measure the inner diameter of a ring that fits your desired finger (in mm).
  2. Compare the measurement to the below chart.
  3. Round up if you are in between two sizes.
Inner Diameter (mm) Ring Size (US)
13.2 2
14.1 3
14.9 4
15.7 5
16.5 6
17.3 7
18.1 8
19.0 9
19.8 10
20.6 11
21.4 12
22.2 13