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Circumference(mm) |
Diameter(mm) |
Australia, UK & Europe |
USA |
Asia |
Switzerland |
44.2 |
14.1 |
F |
3 |
4 |
4 |
44.8 |
14.3 |
F½
|
|
5 |
5¼
|
45.5 |
14.5 |
G |
3½
|
|
|
46.1 |
14.7 |
G½
|
|
6 |
6½
|
46.8 |
14.9 |
H |
4 |
7 |
|
47.4 |
15.1 |
H½
|
|
|
¾ |
48.0 |
15.3 |
I |
4½
|
8 |
|
48.7 |
15.5 |
J |
|
|
9 |
49.3 |
15.7 |
J½
|
5 |
9 |
|
50.0 |
15.9 |
K |
|
|
10 |
50.6 |
16.1 |
K½
|
5½
|
10 |
|
51.2 |
16.3 |
L |
|
|
11¾
|
51.9 |
16.5 |
L½
|
6 |
11 |
12¾
|
52.5 |
16.7 |
M |
|
12 |
|
53.1 |
16.9 |
M½
|
6½
|
13 |
14 |
53.8 |
17.1 |
N |
|
|
|
54.4 |
17.3 |
N½
|
7 |
14 |
15½
|
55.1 |
17.5 |
O |
|
|
|
55.7 |
17.7 |
O½
|
7½
|
15 |
16½
|
56.3 |
17.9 |
P |
|
|
|
57.0 |
18.1 |
P½
|
8 |
16 |
17¾
|
57.6 |
18.3 |
Q |
|
|
|
58.3 |
18.5 |
Q½
|
8½
|
17 |
|
58.9 |
18.8 |
R |
|
|
19 |
59.5 |
19.0 |
R½
|
9 |
18 |
|
60.2 |
19.2 |
S |
|
|
20¼
|
60.8 |
19.4 |
S½
|
9½
|
19 |
|
61.4 |
19.6 |
T |
|
|
21½
|
62.1 |
19.8 |
T½
|
10 |
20 |
|
62.7 |
20.0 |
U |
|
21 |
|
63.4 |
20.2 |
U½
|
10½
|
22 |
22¾
|
64.0 |
20.4 |
V |
|
|
|
64.6 |
20.6 |
V½
|
11 |
23 |
|
65.3 |
20.8 |
W |
|
|
25 |
65.9 |
21.0 |
W½
|
11½
|
24 |
|
66.6 |
21.2 |
X |
|
|
|
67.2 |
21.4 |
X½
|
12 |
25 |
27½
|
67.8 |
21.6 |
Y |
|
|
|
68.5 |
21.8 |
Z |
12½
|
26 |
28¾
|
69.1 |
22.0 |
Z½
|
|
|
|
69.7 |
22.2 |
Z+1 |
13 |
27 |
|
70.4 |
22.4 |
|
|
|
|
71.0 |
22.6 |
|
|
13 |
|