1. Find a piece of string or strip of paper no wider than 3/4".
  2. Wrap it around the base of the appropriate finger.
  3. Use a pen to mark the point on the string/paper where it overlaps, forming a complete circle.
  4. With a ruler, measure the length from the starting end of the string/paper to the pen mark.
  5. Use this measurement and the chart to below to determine your ring size.
Ring Size Measured Size
(USA) (mm)
4 46.5
4.5 47.8
5 49.0
5.5 50.3
6 51.5
6.5 52.8
7 54.0
7.5 55.3
8 56.6
8.5 57.8
9 59.1
9.5 60.3
10 61.6
10.5 62.8
11 64.1
11.5 65.3
12 66.6
12.5 67.9
13 69.1