To determine your Ring Thing ring size, place the thickest part of your middle finger against a ruler and match it to the closest size in the chart below. The Ring Thing should fit snugly on your party finger.

Size Inches Millimeters
8 0.710 (11.3/16) 18
9 0.748 (12/16) 19
10 0.787 (12.5/16) 20
11 0.827 (13/16) 21
12 0.866 (13.8/16) 22
13 0.905 (14.5/16) 23
14 0.945 (15/16) 24
15 0.980 (15.7/16) 25