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Ring Size Chart

American British European Inside Diameter (mm)
A 12.065
38 12.096
12.263
1 12.344
39 12.344
B 12.459
12.657
40 12.733
12.751
C 12.852
41 13.051
2 13.157
D 13.246
42 13.369
13.444
13.564
E 13.640
43 13.687
13.838
3 13.970
44 14.006
F 14.034
14.232
45 14.324
14.376
G 14.427
14.625
46 14.642
4 14.783
H 14.821
47 14.961
15.019
15.189
I 15.215
48 15.279
15.413
5 49 15.597
J 15.608
15.806
50 15.916
K 16.002
16.200
51 16.234
6 L 16.396
52 16.552
16.594
M 16.789
16.815
53 16.871
16.988
N 17.183
54 17.189
7 17.221
17.381
55 17.507
O 17.577
17.628
17.775
56 17.826
P 17.971
8 18.034
57 18.144
18.169
Q 18.364
18.453
58 18.462
18.562
R 18.758
59 18.780
9 18.872
18.956
60 19.098
S 19.152
60 19.098
19.279
19.350
61 19.416
T 19.545
19.741
10 19.761
U 19.939
63 20.054
20.137
10½ 20.168
V 20.333
64 20.372
20.531
11 20.599
65 20.690
W 20.726
20.925
11½ 66 21.008
X 21.120
21.318
67 21.326
12 21.412
Y 21.514
68 21.645
21.712
12½ 21.819
Z 21.908
69 21.963
22.106
13 22.252
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