Men's Ring Sizes:
Inside Diameter (mm)
17.8 - 18.2
Inside Circumference (mm)
56.0 - 57.2
US Ring Size
8 - 8.5 UK Ring Size
Q - Q½
EU Ring Size
57 - 58
Women's Ring Sizes:
Inside Diameter (mm)
15.8 - 16.2
Inside Circumference (mm)
49.7 - 50.9
US Ring Size
5.5 - 6
UK Ring Size
K½ - L
EU Ring Size
50 - 51