Rings size chart - inches

Size: Inside diameter: Inside circumference: USA/Canada sizing UK/Ireland/Australia sizing
(in) (in)
11,25 0.64 2.01 5 3/4 L
11,75 0.65 2.04 6 L 1/2
12 1/2 0.655 2.06 6 1/4 M
13 0.66 2.08 6 1/2 M 1/2
14 1/3 0.68 2.14 7 N 1/2
16,25 0.7 2.22 7 3/4 P
17 1/2 0.72 2.26 8 1/3 Q
18 0.73 2.28 8 1/2 Q 1/2
18,8 0.732 2.31 8 3/4 R
19,5 0.746 2.34 9 R 1/2
20 0.75 2.36 9 1/4 S
21 0.76 2.4 9 1/2 S 3/4
22 0.778 2.44 9 7/8 T 1/2
22 1/2 0.78 2.46 10 1/4 U
23 0.79 2.48 10 3/8 U 1/2
23 3/4 0.793 2.51 10 5/8 V
24 1/4 0.8 2.53 10 7/8 V 1/2
24 3/4 0.81 2.54 11 V 3/4
26 0.82 2.59 11 1/2 W 3/4
26 1/4 0.83 2.6 11 5/8 X
27 0.832 2.63 11 7/8 X 1/2
27 1/8 0.84 2.64 12 X 3/4
28 3/4 0.86 2.7 12 5/8 Z
29 0.863 2.71 12 6/8 Z 1/4
29 1/3 0.87 2.73 12 7/8 Z 1/2
29,5 0.88 2.77 13 3/8 Z + 1/2
Z++ 0.89 2.8 13 1/2 Z++
32,5 0.90 2.83 13 7/8 Z ++ 1/2
34,75 0.902 2.85 14 1/4 Z+++
Z+3 1/2 0.91 2.87 14 1/4 Z+3 1/2
Z++++ 0.92 2.9 14 5/8 Z++++
Z++++.9 0.93 Z++++.9