International ring sizes

 

Baltic,Germany,

Russia,Ukrain and most Ex-USSR (∅ mm.)

USA, Canada

(approx)

Great Britain

(approx)

Switzerland

(approx)

France

(approx)

India

(approx)

Japan

(approx)

15
7.5
47.4
7
7.5
15.5
J
8.75
48.7
9
8.5
16
10.5
50.6
10.5
10
16.5
6
11.75
51.9
12
11
17
13.25
53.1
13
13
17.5
O
15
55.1
15
14.5
18
P
16.25
56.3
16
15.5
18.5
18.25
58.3
18
17
19
9
19.5
59.5
19.5
18
19.5
T
21.5
61.4
21.5
19.5
20
10¼
U
22.75
62.7
23
21
20.5
11
24.75
64.6
25
23
21
11½
26
65.9
26
24
21.5
12¼
Y
27.75
67.8
28
25.5
22
12¾
29
69.1
29
26.5
22.5
13¼
Z1
30.5
70.4
 
23
14
Z3
32.25
72.3