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 11/16 14.46
9 12/16 19.05
10 12.5/16 19.84
11 13.5/16 21.43
12 14/16 22.23
13 14.5/16 23.02
14 15/16 23.81
15 15.5/16 24.61