Ring Size Chart. Size your finger for a Ring Measure your ring size. Shop a Jewish ring now. US Size Dia.in inch Dia. in MM British French German Japanese Swiss 0000 .390 9.91 - 00 .422 10.72 - 0 .454 11.53 - 1/2 .474 11.95 A 3/4 .482 12.18 A 1/2 1 .487 12.37 B 1 1 1/4 - 12.60 B 1/2 1 1/2 .503 12.78 C 1 3/4 - 13.00 C 1/2 2 .520 13.21 D 41 1/2 13 1/2 2 1 1/2 2 1/4 - 13.41 D 1/2 - - 2 1/2 .536 13.61 E 42 3/4 13 3/4 3 2 3/4 2 3/4 - 13.83 E 1/2 - - 3 .553 14.05 F 44 14 4 4 3 1/8 - 14.15 F 1/2 - - 3 1/4 - 14.25 - - - 3 3/8 - 14.36 G 45 1/4 - 5 5 1/4 3 1/2 .569 14.45 - - 14 1/2 3 5/8 - 14.56 G 1/2 - 6 3 3/4 - 14.65 H 46 1/2 6 1/2 4 .585 14.86 H 1/2 - 15 7 4 1/4 - 15.04 I 47 3/4 7 3/4 4 1/2 .601 15.27 I 1/2 - 15 1/4 8 4 5/8 - 15.40 J 49 15 1/2 9 4 3/4 - 15.53 - - 5 .618 15.70 J 1/2 - 15 3/4 9 5 1/8 - 15.80 K 50 10 5 1/4 - 15.90 - - 5 3/8 - 16.0 K 1/2 - 10 5 1/2 .634 16.10 L 51 3/4 16 11 3/4 5 3/4 - 16.30 - - 5 7/8 - 16.41 L 1/2 - 6 .650 16.51 M 52 3/4 16 1/2 12 12 3/4 6 1/4 - 16.71 M 1/2 - 6 1/2 .666 16.92 N 54 17 13 14 6 3/4 - 17.13 N 1/2 - 7 .683 17.35 O 55 1/4 17 1/4 14 15 1/4 7 1/4 - 17.45 O 1/2 - 7 1/2 .699 17.75 P 56 1/2 17 3/4 15 16 1/2 7 3/4 - 17.97 P 1/2 - 8 .716 18.19 Q 57 3/4 18 16 17 3/4 8 1/4 - 18.35 Q 1/2 - 8 1/2 .732 18.53 - - 18 1/2 17 8 5/8 - 18.61 R 59 19 8 3/4 - 18.69 - - 8 7/8 - 18.80 R 1/2 - 9 .748 18.89 - - 19 18 9 1/8 - 19.10 S 60 1/4 20 1/4 9 1/4 - 19.22 - - 9 3/8 - 19.31 S 1/2 - 9 1/2 .764 19.41 - - 19 1/2 19 9 5/8 - 19.51 T 61 1/2 21 1/2 9 3/4 - 19.62 - - 10 .781 19.84 T 1/2 - 20 20 10 1/4 - 20.02 U 62 3/4 21 22 3/4 10 1/2 .797 20.20 U 1/2 - 20 1/4 22 10 5/8 - 20.32 V 63 23 3/4 10 3/4 - 20.44 - - 11 .814 20.68 V 1/2 - 20 3/4 23 11 1/8 - 20.76 W 65 25 11 1/4 - 20.85 - - 11 3/8 - 20.94 W 1/2 - 11 1/2 - 21.08 - - 21 24 11 5/8 .830 21.18 X 66 1/4 26 1/4 11 3/4 - 21.24 - - 11 7/8 - 21.30 X 1/2 - 12 .846 21.49 Y 67 1/2 21 1/4 25 27 1/2 12 1/4 - 21.69 Y 1/2 - 12 1/2 .862 21.89 Z 68 3/4 21 3/4 26 28 3/4 12 3/4 - 22.10 Z 1/2 - 13 .879 22.33 - - 22 27