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US Ring Size to Other Country Ring Size Conversion Table

 
US
6
7
8
9
10
British
M
O
Q
R 1/2
T 1/2
French
52 3/4
55 1/4
57 3/4
60
62 3/4
German
16 1/2
17 1/4
18
19
20
Japan
12
14
16
18
20
Swiss
12 3/4
15 1/4
17 3/4
20
22 3/4
Diameter (mm)
16.51
17.35
18.19
18.89
19.84

 

 
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