MEASUREMENTS RING CONVERSION
Inches mm British US Japanese French Swiss German
1 3/4 44.5 F 3 4 44 4 14.0
1 25/32 45.2 G 3.5 6 46 5.5 14.5
1 13/16 46.0 H 4 7 47 7 15.0
1 7/8 47.6 I 4.5 8 48 9 15.5
1 15/16 49.2 J 5 9 50 10 15.8
2 50.8 K 5.5 10 52 12 16.0
2 1/16 52.4 L 6 12 53 13 16.5
2 3/32 53.2 M 6.5 13 54 14 17.0
2 1/8 54.0 N 7 14 55 15 17.3
2 3/16 55.6 0 7.5 15 56 16.5 17.8
2 1/4 57.2 P 8 16 57 18 18.0
2 5/32 57.82 Q 8.5 17 58 19 18.5
2 5/16 58.7 R 9 18 59 20 19.0
2 3/8 60.3 S 9.5 19 60 21.5 19.5
2 7/16 61.9 T 10 20 61 22 20.3
2 1/2 63.5 U 10.5 22 62 23.5 20.8
2 9/16 65.1 W 11 23 63 25 21.0
2 19/32 65.9 X 11.5 24 64 26 21.3
2 5/8 66.7 Y 12 25 66 27.5 21.8