Detailed Ring Size Chart
Diameter (mm) Circumference (mm) India / Sri Lanka US / Canada UK / Australian Japanese Swiss
11.6
36.5
0
11.8
37.2
1/4
12
37.8
1/2
A
12.2
38.4
3/4
A 1/2
12.4
39.1
1
B
1
12.6
39.7
1/2
1 1/4
B 1/2
12.9
40.4
3/4
1 1/2
C
13.1
41
1
1 3/4
C 1/2
13.3
41.6
2
2
D
2
1.5
13.5
42.3
2 1/2
2 1/4
D 1/2
13.7
42.9
3
2 1/2
E
3
2.75
13.9
43.5
4
2 3/4
E 1/2
14.1
44.2
4 1/2
3
F
4
4
14.3
44.8
5
3 1/4
F 1/2
5
5.25
14.5
45.5
5 1/2
3 1/2
G
14.7
46.1
6
3 3/4
G 1/2
6
6.5
14.9
46.7
6 1/2
4
H
7
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