Ring Size Equivalence Table
Ring Size Guidelines
US
Japan
Britain
Inside Diameter MM / Inchs
2
D
13.2 / 0.52
3
4
F
14.1 / 0.55
7
H 1/2
14.9 / 0.59
5
9
J 1/2
15.7 / 0.62
6
12
L
16.5 / 0.65
14
N
17.4 / 0.68
8
16
P 1/2
18.2 / 0.72
18
R 1/2
19.0 / 0.75
10
20
T 1/2
19.8 / 0.78
11
23
V 1/2
20.7 / 0.81
25
Y
21.4 / 0.85
