Ring Chart
| Diam. mm |
Diam. inches |
UK |
USA |
France |
Germany |
Japan |
Swiss |
| 11.95 |
15/32 |
A |
1/2 |
|
|
|
|
| 12.37 |
31/64 |
B |
1 |
|
|
1 |
|
| 12.78 |
1/2 |
C |
1 1/2 |
|
|
|
|
| 13.21 |
33/64 |
D |
2 |
41 1/2 |
13 1/2 |
2 |
1 1/2 |
| 13.61 |
17/32 |
E |
2 1/2 |
42 3/4 |
13 3/4 |
3 |
2 3/4 |
| 14.05 |
35/64 |
F |
3 |
44 |
14 |
4 |
4 |
| 14.45 |
9/16 |
|
3 1/2 |
|
14 1/2 |
|
|
| 14.86 |
37/64 |
H 1/2 |
4 |
|
15 |
7 |
|
| 15.27 |
19/32 |
I 1/2 |
41/2 |
|
15 1/4 |
8 |
|
| 15.70 |
5/8 |
J 1/2 |
5 |
|
15 3/4 |
9 |
|
| 16.10 |
41/64 |
L |
5 1/2 |
51 3/4 |
16 |
|
11 3/4 |
| 16.51 |
21/32 |
M |
6 |
52 3/4 |
16 1/2 |
12 |
12 3/4 |
| 16.92 |
43/64 |
N |
6 1/2 |
54 |
17 |
13 |
14 |
| 17.35 |
11/16 |
O |
7 |
55 1/4 |
17 1/4 |
14 |
15 1/4 |
| 17.75 |
45/64 |
P |
7 1/2 |
56 1/2 |
17 3/4 |
15 |
16 1/2 |
| 18.19 |
23/32 |
Q |
8 |
57 3/4 |
18 |
16 |
17 3/4 |
| 18.53 |
47/64 |
|
8 1/2 |
|
18 1/2 |
17 |
|
| 18.89 |
3/4 |
|
9 |
|
19 |
18 |
|
| 19.41 |
49/64 |
|
9 1/2 |
|
19 1/2 |
19 |
|
| 19.84 |
25/32 |
T 1/2 |
10 |
|
20 |
20 |
|
| 20.20 |
51/64 |
U 1/2 |
10 1/2 |
|
20 1/4 |
22 |
|
| 20.68 |
13/16 |
V 1/2 |
11 |
|
20 3/4 |
23 |
|
| 21.08 |
53/64 |
|
11 1/2 |
|
21 |
24 |
|
| 21.49 |
27/32 |
Y |
12 |
67 1/2 |
21 1/4 |
25 |
27 1/2 |
| 21.89 |
55/64 |
Z |
12 1/2 |
68 /37 |
21 3/4 |
26 |
28 3/4 |
| 22.3 |
7/8 |
|
13 |
|
22 |
27 |
|
