Ring Sizes
Ring Size (US) |
Inside Circumference (mm) |
Diameter (mm) |
UK |
3 |
44.4 |
14.1 |
F |
3.25 |
45.1 |
14.3 |
F 1/2 |
3.5 |
45.7 |
14.5 |
G |
3.75 |
46.3 |
14.7 |
G 1/2 |
4 |
46.9 |
14.9 |
H |
4.25 |
47.6 |
15.1 |
H 1/2 |
4.5 |
48.2 |
15.3 |
I |
4.75 |
48.8 |
15.5 |
J |
5 |
49.4 |
15.7 |
J 1/2 |
5.25 |
50.1 |
15.9 |
K |
5.5 |
50.7 |
16.1 |
K 1/2 |
5.75 |
51.3 |
16.3 |
L |
6 |
52.0 |
16.5 |
L 1/2 |
6.25 |
52.6 |
16.7 |
M |
6.5 |
53.2 |
16.9 |
M 1/2 |
6.75 |
53.8 |
17.1 |
N |
7 |
54.5 |
17.3 |
N 1/2 |
7.25 |
55.1 |
17.5 |
O |
7.5 |
55.7 |
17.7 |
O 1/2 |
7.75 |
56.4 |
17.9 |
P |
8 |
57.0 |
18.1 |
P 1/2 |
8.25 |
57.6 |
18.3 |
Q |
8.5 |
58.2 |
18.5 |
Q 1/2 |
8.75 |
58.9 |
18.7 |
R |
9 |
59.5 |
18.9 |
R 1/2 |
9.25 |
60.1 |
19.1 |
S |
9.5 |
60.8 |
19.3 |
S 1/2 |
9.75 |
61.4 |
19.5 |
T |
10 |
62.0 |
19.7 |
T 1/2 |
10.25 |
62.6 |
19.9 |
U |
10.5 |
63.3 |
20.1 |
U 1/2 |
10.75 |
63.9 |
20.3 |
V |
11 |
64.5 |
20.5 |
V 1/2 |
11.25 |
65.2 |
20.7 |
W |
11.5 |
65.8 |
20.9 |
W 1/2 |
11.75 |
66.4 |
21.1 |
X |
12 |
67.0 |
21.3 |
X 1/2 |
12.25 |
67.7 |
21.5 |
Y |
12.5 |
68.3 |
21.7 |
Y 1/2 |
12.75 |
68.9 |
21.9 |
Z |
13 |
69.6 |
22.1 |
Z 1/2 |