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International Ring Sizes
Other countries use a different scale to the U.K; you can use the table below to help you decide which size you need.
| Circumference(mm) |
Diameter(mm) |
Europe |
UK & Australia |
US & Canada |
| 44.2 |
14.1 |
44 |
F½ |
3 |
| 44.8 |
14.3 |
45 |
G |
|
| 45.5 |
14.5 |
|
G½ |
3½ |
| 46.1 |
14.7 |
46 |
H |
|
| 46.8 |
14.9 |
47 |
H½ |
4 |
| 47.4 |
15.1 |
|
I |
|
| 48.0 |
15.3 |
48 |
I½ |
4½< |
| 48.7 |
15.5 |
|
J |
|
| 49.3 |
15.7 |
49 |
J½ |
5 |
| 50.0 |
15.9 |
50 |
K |
|
| 50.6 |
16.1 |
|
K½ |
5½ |
| 51.2 |
16.3 |
51 |
L |
|
| 51.9 |
16.5 |
52 |
L½ |
6 |
| 52.5 |
16.7 |
|
M |
|
| 53.1 |
16.9 |
53 |
M½ |
6½ |
| 53.8 |
17.1 |
|
N |
|
| 54.4 |
17.3 |
54 |
N½ |
7 |
| 55.1 |
17.5 |
55 |
O |
|
| 55.7 |
17.7 |
|
O½ |
7½ |
| 56.3 |
17.9 |
56 |
P |
|
| 57.0 |
18.1 |
57 |
P½ |
8 |
| 57.2 |
18.2 |
|
|
|
| 57.6 |
18.3 |
|
Q |
|
| 58.3 |
18.5 |
58 |
Q½ |
8½ |
| 58.9 |
18.8 |
59 |
R |
|
| 59.5 |
19.0 |
|
R½ |
9 |
| 60.2 |
19.2 |
60 |
S |
|
| 60.8 |
19.4 |
61 |
S½ |
9½ |
| 61.4 |
19.6 |
|
T |
|
| 62.1 |
19.8 |
62 |
T½ |
10 |
| 62.7 |
20.0 |
|
U |
|
| 63.4 |
20.2 |
63 |
U½ |
10½ |
| 64.0 |
20.4 |
64 |
V |
|
| 64.6 |
20.6 |
|
V½ |
11 |
| 65.3 |
20.8 |
65 |
W |
|
| 65.9 |
21.0 |
66 |
W½ |
11½ |
| 66.6 |
21.2 |
|
X |
|
| 67.2 |
21.4 |
67 |
X½ |
12 |
| 67.8 |
21.6 |
|
Y |
|
| 68.5 |
21.8 |
68 |
Z |
12½ |
| 69.1 |
22.0 |
69 |
Z |
|
| 69.7 |
22.2 |
70 |
|
13 |
| 70.4 |
22.4 |
|
Z+1 |
|
| 71.0 |
22.6 |
|
Z+2 |
13½ |
