| Ring Size (US) |
Ring Size (UK) |
Ring Size (EU) |
Ring Size (JP) |
Diameter (mm) |
Circumference (mm) |
| 3 |
F |
10.5 |
3 |
14.1 |
44.2 |
| 3 1/4 |
F 1/2 |
11 |
3.5 |
14.4 |
45.1 |
| 3 1/2 |
G |
11.5 |
4 |
14.7 |
46.0 |
| 3 3/4 |
G 1/2 |
12 |
4.5 |
15.0 |
46.9 |
| 4 |
H |
12.5 |
5 |
14.9 |
46.9 |
| 4 1/4 |
H 1/2 |
13 |
5.5 |
15.2 |
47.8 |
| 4 1/2 |
I |
13.5 |
6 |
15.6 |
48.6 |
| 4 3/4 |
I 1/2 |
14 |
6.5 |
15.9 |
49.5 |
| 5 |
J |
14.5 |
7 |
16.2 |
50.4 |
| 5 1/4 |
J 1/2 |
15 |
7.5 |
16.5 |
51.2 |
| 5 1/2 |
K |
15.5 |
8 |
16.9 |
52.1 |
| 5 3/4 |
K 1/2 |
16 |
8.5 |
17.2 |
53.0 |
| 6 |
L |
16.5 |
9 |
17.5 |
53.9 |
| 6 1/4 |
L 1/2 |
17 |
9.5 |
17.8 |
54.7 |
| 6 1/2 |
M |
17.5 |
10 |
18.2 |
55.6 |
| 6 3/4 |
M 1/2 |
18 |
10.5 |
18.5 |
56.5 |
| 7 |
N |
18.5 |
11 |
18.9 |
57.4 |
| 7 1/4 |
N 1/2 |
19 |
11.5 |
19.2 |
58.2 |
| 7 1/2 |
O |
19.5 |
12 |
19.5 |
59.1 |
| 7 3/4 |
O 1/2 |
20 |
12.5 |
19.8 |
60.0 |
| 8 |
P |
20.5 |
13 |
20.2 |
60.9 |
| 8 1/4 |
P 1/2 |
21 |
13.5 |
20.5 |
61.7 |
| 8 1/2 |
Q |
21.5 |
14 |
20.8 |
62.6 |
| 8 3/4 |
Q 1/2 |
22 |
14.5 |
21.1 |
63.5 |
| 9 |
R |
22.5 |
15 |
21.5 |
64.4 |
| 9 1/4 |
R 1/2 |
23 |
15.5 |
21.8 |
65.2 |
| 9 1/2 |
S |
23.5 |
16 |
22.2 |
66.1 |
| 9 3/4 |
S 1/2 |
24 |
16.5 |
22.5 |
67.0 |
| 10 |
T |
24.5 |
17 |
22.8 |
67.9 |
| 10 1/4 |
T 1/2 |
25 |
17.5 |
23.1 |
68.7 |
| 10 1/2 |
U |
25.5 |
18 |
23.5 |
69.6 |
| 10 3/4 |
U 1/2 |
26 |
18.5 |
23.8 |
70.5 |
| 11 |
V |
26.5 |
19 |
24.2 |
71.4 |
| 11 1/4 |
V 1/2 |
27 |
19.5 |
24.5 |
72.2 |
| 11 1/2 |
W |
27.5 |
20 |
24.8 |
73.1 |
| 11 3/4 |
W 1/2 |
28 |
20.5 |
25.1 |
74.0 |
| 12 |
X |
28.5 |
21 |
25.5 |
74.9 |
| 12 1/4 |
X 1/2 |
29 |
21.5 |
25.8 |
75.7 |
| 12 1/2 |
Y |
29.5 |
22 |
26.1 |
76.6 |
| 12 3/4 |
Y 1/2 |
30 |
22.5 |
26.5 |
77.5 |
| 13 |
Z |
30.5 |
23 |
26.8 |
78.4 |
| 13 1/4 |
Z 1/2 |
31 |
23.5 |
27.1 |
79.2 |
| 13 1/2 |
1 |
31.5 |
24 |
27.5 |
80.1 |
| 13 3/4 |
1 1/2 |
32 |
24.5 |
27.8 |
81.0 |
