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Ring Size Conversion Chart
Circumference (mm) |
Inside Diameter (mm) |
NZ, Australia & UK |
USA & Canada |
China, Japan & Singapore |
44.2 |
14.1 |
F |
3 |
4 |
45.5 |
14.5 |
G |
3 1/2 |
5 1/2 |
46.8 |
14.9 |
H |
4 |
7 |
48.0 |
15.3 |
I |
4 1/2 |
8 |
48.7 |
15.5 |
J |
4 3/4 |
8 1/2 |
50.0 |
15.9 |
K |
5 1/4 |
9 1/2 |
51.2 |
16.3 |
L |
5 3/4 |
10 1/2 |
52.5 |
16.7 |
M |
6 1/4 |
12 |
53.8 |
17.1 |
N |
6 3/4 |
13 1/2 |
55.1 |
17.5 |
O |
7 1/4 |
14 1/2 |
56.3 |
17.9 |
P |
7 3/4 |
15 1/2 |
57.6 |
18.3 |
Q |
8 1/4 |
16 1/2 |
58.9 |
18.8 |
R |
8 3/4 |
17 1/2 |
60.2 |
19.2 |
S |
9 1/4 |
18 1/2 |
61.4 |
19.6 |
T |
9 3/4 |
19 1/2 |
62.7 |
20.0 |
U |
10 1/4 |
21 |
64.0 |
20.4 |
V |
10 3/4 |
22 1/2 |
65.3 |
20.8 |
W |
11 1/4 |
23 1/2 |
66.6 |
21.2 |
X |
11 3/4 |
24 1/2 |
67.8 |
21.6 |
Y |
12 1/4 |
25 1/2 |
68.5 |
21.8 |
Z |
12 1/2 |
26 |
70.4 |
22.4 |
Z+1 |
13 1/4 |
27 1/2 |