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 -