International Ring Sizing Chart
USA Size Diam inch Diam mm Circ 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 38.9 B - - 1 -
1 1/4 - 12.60 39.6 B 1/2 - - - -
1 1/2 .503 12.78 40.2 C - - - -
1 3/4 - 13.00 40.8 C 1/2 - - - -
2 .520 13.21 41.5 D 41 1/2 13 1/2 2 1 1/2
2 1/4 - 13.41 42.1 D 1/2 - - - -
2 1/2 .536 13.61 42.7 E 42 3/4 13 3/4 3 2 3/4
2 3/4 - 13.83 43.4 E 1/2 - - - -
3 .553 14.05 44.0 F 44 14 4 4
3 1/8 - 14.15 44.3 F 1/2 - - - -
3 1/4 - 14.25 44.6 - - - - -
3 3/8 - 14.36 44.9 G 45 1/4 - 5 5 1/4
3 1/2 .569 14.45 45.2 - - 14 1/2 - -
3 5/8 - 14.56 45.6 G 1/2 - - 6 -
3 3/4 - 14.65 45.9 H 46 1/2 - - 6 1/2
4 .585 14.86 46.5 H 1/2 - 15 7 -
4 1/4 - 15.04 47.1 I 47 3/4 - - 7 3/4
4 1/2 .601 15.27 47.8 I 1/2 - 15 1/4 8 -
4 5/8 - 15.40 48.1 J 49 15 1/2 - 9
4 3/4 - 15.53 48.4 - - - - -
5 .618 15.70 49.0 J 1/2 - 15 3/4 9 -
5 1/8 - 15.80 49.3 K 50 - - 10
5 1/4 - 15.90 49.6 - - - - -
5 3/8 - 16.0 50.0 K 1/2 - - 10 -
5 1/2 .634 16.10 50.3 L 51 3/4 16 - 11 3/4
5 3/4 - 16.30 50.9 - - - - -
5 7/8 - 16.41 51.3 L 1/2 - - - -
6 .650 16.51 51.5 M 52 3/4 16 1/2 12 12 3/4
6 1/4 - 16.71 52.2 M 1/2 - - - -
6 1/2 .666 16.92 52.8 N 54 17 13 14
6 3/4 - 17.13 53.4 N 1/2 - - - -
7 .683 17.35 54.0 O 55 1/4 17 1/4 14 15 1/4
7 1/4 - 17.45 54.7 O 1/2 - - - -
7 1/2 .699 17.75 55.3 P 56 1/2 17 3/4 15 16 1/2
7 3/4 - 17.97 55.9 P 1/2 - - - -
8 .716 18.19 56.6 Q 57 3/4 18 16 17 3/4
8 1/4 - 18.35 57.2 Q 1/2 - - - -
8 1/2 .732 18.53 57.8 - - 18 1/2 17 -
8 5/8 - 18.61 58.4 R 59 - - 19
8 3/4 - 18.69 58.4 - - - - -
8 7/8 - 18.80 59.0 R 1/2 - - - -
9 .748 18.89 59.1 - - 19 18 -
9 1/8 - 19.10 59.4 S 60 1/4 - - 20 1/4
9 1/4 - 19.22 59.7 - - - - -
9 3/8 - 19.31 60.0 S 1/2 - - - -
9 1/2 .764 19.41 60.3 - - 19 1/2 19 -
9 5/8 - 19.51 60.6 T 61 1/2 - - 21 1/2
9 3/4 - 19.62 60.9 - - - - -
10 .781 19.84 61.6 T 1/2 - 20 20 -
10 1/4 - 20.02 62.2 U 62 3/4 - 21 22 3/4
10 1/2 .797 20.20 62.8 U 1/2 - 20 1/4 22 -
10 5/8 - 20.32 63.1 V 63 - - 23 3/4
10 3/4 - 20.44 63.5 - - - - -
11 .814 20.68 64.1 V 1/2 - 20 3/4 23 -
11 1/8 - 20.76 64.3 W 65 - - 25
11 1/4 - 20.85 64.7 - - - - -
11 3/8 - 20.94 65.0 W 1/2 - - - -
11 1/2 - 21.08 65.3 - - 21 24 -
11 5/8 .830 21.18 65.7 X 66 1/4 - - 26 1/4
11 3/4 - 21.24 66.0 - - - - -
11 7/8 - 21.30 66.3 X 1/2 - - - -
12 .846 21.49 66.6 Y 67 1/2 21 1/4 25 27 1/2
12 1/2 .862 21.89 67.9 Z 68 3/4 21 3/4 26 28 3/4
12 3/4 - 22.10 68.5 Z 1/2 - - - -
13 .879 22.33 69.1 - - 22 27 -
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