Measurements
 Ring Conversion Table
(Millimeters) US British French German Swiss Japanese Size 
46 4 H 47 15 7 7 S
47.6 4.5 I 48 15.5 9 8 S
49.2 5 J 50 15.8 10 9 S
50.8 5.5 K 52 16 12 10 S
52.4 6 L 53 16.5 13 12 S
53.2 6.5 M 54 17 14 13 M
54 7 N 55 17.3 15 14 M
55.6 7.5 O 56 17.8 16.5 15 M
57.2 8 P 57 18 18 16 M
57.8 8.5 Q 58 18.5 19 17 M
58.7 9 R 59 19 20 18 M
60.3 9.5 S 60 19.5 21.5 19 L
61.9 10 T 61 20.3 22 20 L
63.5 10.5 U 62 20.8 23.5 22 L
65.1 11 W 63 21 25 23 L
65.9 11.5 X 64 21.3 26 24 L
66.7 12 Y 66 21.8 27.5 25 L