| Ring Size Conversion Chart |
| Ring diameter (mm) |
| 13 |
13 1/3 |
13 2/3 |
14 |
14 1/3 |
14 2/3 |
15 |
15 1/3 |
15 2/3 |
16 |
16 1/3 |
16 2/3 |
17 |
17 1/3 |
17 2/3 |
18 |
18 1/3 |
18 2/3 |
19 |
19 1/3 |
19 2/3 |
20 |
20 1/3 |
20 2/3 |
21 |
21 1/3 |
21 2/3 |
| 40.8 |
41.9 |
42.9 |
44 |
45 |
46.1 |
47.1 |
48.2 |
49.2 |
50.3 |
51.3 |
52.4 |
53.4 |
54.5 |
55.5 |
56.6 |
57.6 |
58.6 |
59.7 |
60.7 |
61.8 |
62.8 |
63.9 |
64.9 |
66 |
67 |
68 |
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
| --- |
3 |
5 |
6 |
7.5 |
8.25 |
9 |
10 |
11 |
11.5 |
12 |
13 |
14.5 |
16 |
17 |
18 |
19 |
20.5 |
22 |
23 |
23.5 |
24 |
25 |
26 |
27.75 |
29 |
30 |
| 1 |
2 |
2.5 |
3 |
3.5 |
3.4-4 |
4-4.5 |
4.5-5 |
5 |
5.5 |
6 |
6.5 |
6.5-7 |
7-7.5 |
7.5-8 |
8 |
8.5 |
9 |
9.5 |
10 |
10-10.5 |
10.5 |
11 |
11.5 |
12 |
12.5 |
13 |
| C |
D |
E |
F |
G |
G-H |
H-I |
I-J |
J |
K |
L |
L-M |
M-N |
N-O |
O-P |
P |
Q |
R |
S |
T |
T-U |
U |
V |
W |
X |
Y |
Z |
|
| Inner circumference (mm) |
| Japan |
| HK |
| US |
| UK / Australia |
|
|
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