International Ring Size Conversion Table

U.S. & Canada Great Britain  France   Germany   Japan   Switzerland 
3-1/2 - - 14-1/2 - -
3-3/4 H 46-1/2 - 6-1/2 6-1/2
4 H-1/2 - 15 7 -
4-1/4 I 47-3/4 - - 7-3/4
4-1/2 I-1/2 - 15-1/4 8 -
4-3/4 J 49 - - 9
5 J-1/2 - 15-3/4 9 -
5-1/4 K 50 - - 10
5-1/2 L 51-3/4 16 - 11-3/4
5-3/4 L-1/2 - - 11 -
6 M 52-3/4 16-1/2 12 12-3/4
6-1/2 N 54 17 13 14
7 O 55-1/4 17-1/4 14 15-1/4
7-1/2 P 56-1/2 17-3/4 15 16-1/2
8 Q 57-3/4 18 16 17-3/4
8-1/2 - - 18-1/2 17 -
8-3/4 R 59 - - 19
9 - - 19 18 -
9-1/4 S 60-1/4 - - 20-1/4
9-1/2 - - 19-1/2 19 -
9-3/4 T 61-1/2 - - 21-1/2
10 T-1/2 - 20 20 ...
10-1/4 U 62-3/4 - 21 22-3/4
10-1/2 U-1/2 - 20-1/4 22 -
10-3/4 V 63-3/4 - - 23-3/4
11 V-1/2 - 20-3/4 23 -
11-1/4 W 65 - - 25
11-1/2 - - 21 24 -
11-3/4 X 66-1/4 - - 26-1/4
12 Y 67-1/2 21-1/4 25 27-1/2
12-1/2 Z 68-3/4 21-3/4 26 28-3/4
13 - - 22 27 -


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