International Ring Size Conversion |
Dia. (MM) |
US/CA |
UK/AU |
Asia |
Swiss |
14.9 |
4 |
H |
7 |
7 |
15.3 |
4.5 |
I |
8 |
8.5 |
15.7 |
5 |
J 1/2 |
9 |
9.5 |
16.1 |
5.5 |
K 1/2 |
10 |
11 1/2 |
16.5 |
6 |
L 1/2 |
11 |
12 3/4 |
16.9 |
6.5 |
M 1/2 |
13 |
14 |
17.3 |
7 |
N 1/2 |
14 |
15 1/4 |
17.7 |
7.5 |
0 1/2 |
15 |
16 1/2 |
18.1 |
8 |
P 1/2 |
16 |
17 3/4 |
18.5 |
8.5 |
Q 1/2 |
17 |
18 1/2 |
19.0 |
9 |
R 1/2 |
18 |
19 1/2 |
19.4 |
9.5 |
S 1/2 |
19 |
20 3/4 |
19.8 |
10 |
T 1/2 |
20 |
21 3/4 |
20.2 |
10.5 |
U 1/2 |
22 |
22 1/4 |
20.6 |
11 |
V 1/2 |
23 |
24 |
21.0 |
11.5 |
W 1/2 |
24 |
26 1/4 |
21.4 |
12 |
X 1/2 |
25 |
27 1/2 |
21.8 |
12.5 |
Z |
26 |
28 3/4 |
22.2 |
13 |
Z + 1 |
27 |
29 1/4 |
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