Country

Ring Size Table

Inside Diameter Inside Circumference Sizes
MM Inches MM Inches USA & Canada British & Australian French German Swiss
11.95 0.474 37.54 1.49 1/2 A - - -
12.18 0.482 38.26 1.51 3/4 A 1/2 - - -
12.37 0.487 38.86 1.53 1 B - - -
12.60 0.496 39.58 1.56 1 1/4 B 1/2 - - -
12.78 0.503 40.15 1.58 1 1/2 C - - -
13.00 0.512 40.84 1.61 1 3/4 C 1/2 - - -
13.21 0.520 41.50 1.63 2 D 41 1/2 13 1/2 1 1/2
13.41 0.528 42.13 1.66 2 1/4 D 1/2 - - -
13.61 0.536 42.76 1.68 2 1/2 E 42 3/4 13 3/4 2 3/4
13.83 0.544 43.45 1.71 2 3/4 E 1/2 - - -
14.05 0.553 44.14 1.74 3 F 44 14 4
14.15 0.557 44.45 1.75 3 1/8 F 1/2 - - -
14.25 0.561 44.77 1.76 3 1/4 F 3/4 - - -
14.36 0.565 45.11 1.77 3 3/8 G 45 1/4 - 5 1/4
14.45 0.569 45.40 1.79 3 1/2 G 1/4 - 14 1/2 -
14.56 0.573 45.74 1.80 3 5/8 G 1/2 - - -
14.65 0.577 46.02 1.81 3 3/4 H 46 1/2 - 6 1/2
14.86 0.585 46.68 1.84 4 H 1/2 - 15 -
15.04 0.592 47.25 1.86 4 1/4 I 47 3/4 - 7 3/4
15.27 0.601 47.97 1.89 4 1/2 I 1/2 - 15 1/4 -
15.40 0.606 48.38 1.90 4 5/8 J 49 15 1/2 9
15.53 0.611 48.79 1.92 4 3/4 J 1/4 - - -
15.70 0.618 49.32 1.94 5 J 1/2 - 15 3/4 -
15.80 0.622 49.64 1.95 5 1/8 K 50 - 10
15.90 0.626 49.95 1.97 5 1/4 K 1/4 - - -
16.00 0.630 50.27 1.98 5 3/8 K 1/2 - - -
16.10 0.634 50.58 1.99 5 1/2 L 51 3/4 16 11 3/4
16.30 0.642 51.21 02.02 5 3/4 L 1/4 - - -
16.41 0.646 51.55 02.03 5 7/8 L 1/2 - - -
16.51 0.650 51.87 02.04 6 M 52 3/4 16 1/2 12 3/4
16.71 0.658 52.50 02.07 6 1/4 M 1/2 - - -
16.92 0.666 53.16 02.09 6 1/2 N 54 17 14
17.13 0.674 53.82 2.12 6 3/4 N 1/2 - - -
17.35 0.683 54.51 2.15 7 O 55 1/4 17 1/4 15 1/4
17.45 0.687 54.82 2.16 7 1/4 O 1/2 - - -
17.75 0.699 55.76 2.20 7 1/2 P 56 1/2 17 3/4 16 1/2
17.97 0.707 56.45 2.22 7 3/4 P 1/2 - - -
18.19 0.716 57.15 2.25 8 Q 57 3/4 18 17 3/4
18.35 0.722 57.65 2.27 8 1/4 Q 1/2 - - -
18.53 0.729 58.21 2.29 8 1/2 Q 3/4 - 18 1/2 -
18.61 0.733 58.47 2.30 8 5/8 R 59 - 19
18.69 0.736 58.72 2.31 8 3/4 R 1/4 - - -
18.80 0.740 59.06 2.32 8 7/8 R 1/2 - - -
18.89 0.748 59.34 2.35 9 R 3/4 - 19 -
19.10 0.752 60.00 2.36 9 1/8 S 60 1/4 - 20 1/4
19.22 0.757 60.38 2.38 9 1/4 S 1/4 - - -
19.31 0.760 60.66 2.39 9 3/8 S 1/2 - - -
19.41 0.764 60.98 2.40 9 1/2 S 3/4 - 19 1/2 -
19.51 0.768 61.29 2.41 9 5/8 T 61 1/2 - 21 1/2
19.62 0.772 61.64 2.43 9 3/4 T 1/4 - - -
19.84 0.781 62.33 2.45 10 T 1/2 - 20 -
20.02 0.788 62.89 2.48 10 1/4 U 62 3/4 - 22 3/4
20.20 0.797 63.46 2.50 10 1/2 U 1/2 - 20 1/4 -
20.32 0.800 63.84 2.51 10 5/8 V 63 - 23 3/4
20.44 0.805 64.21 2.53 10 3/4 V 1/4 - - -
20.68 0.814 64.97 2.56 11 V 1/2 - 20 3/4 -
20.76 0.817 65.22 2.57 11 1/8 W 65 - 25
20.85 0.821 65.50 2.58 11 1/4 W 1/4 - - -
20.94 0.824 65.78 2.59 11 3/8 W 1/2 - - -
21.08 0.830 66.22 2.61 11 1/2 W 3/4 - 21 -
21.18 0.834 66.54 2.62 11 5/8 X 66 1/4 - 26 1/4
21.24 0.836 66.73 2.63 11 3/4 X 1/4 - - -
21.30 0.839 66.92 2.64 11 7/8 X 1/2 - - -
21.49 0.846 67.51 2.66 12 Y 67 1/2 21 1/4 27 1/2
21.69 0.854 68.14 2.68 12 1/4 Y 1/2 - - -
21.89 0.862 68.77 2.71 12 1/2 Z 68 3/4 21 3/4 29
22.10 0.870 69.43 2.73 12 3/4 Z +1/2 - - 29 1/2
22.33 0.879 70.15 2.76 13 Z+1 70.0 22 1/4 30
22.54 0.887 70.81 2.788 13-1/4 Z+1 1/2 70.5 22 1/2 31
22.60 0.890 71.00 2.80 13.5 Z+2 71.0 32
22.92 0.902 72.01 2.835 13-3/4 Z+2 1/2 71.5 22 3/4 32 1/2
23.16 0.912 72.76 2.865 14 Z+3 72.0 23 33
23.37 0.92 73.42 2.891 14-1/4 Z+3 1/2 72.5 23 1/4 33 1/2
23.55 0.927 73.98 2.913 14-1/2 Z+4 73.5 23 1/2 34 1/2
23.78 0.936 74.71 2.941 14-3/4 Z+4 1/2 74.0 35
24 0.945 75.4 2.969 15 Z+5 74.5 23 3/4 36
24.19 0.952 76 2.992 15-1/4 Z+5 1/2 75.0 24 36 1/2
24.41 0.961 76.69 3.019 15-1/2 Z+6 76.0 24 1/4 37
24.61 0.969 77.31 3.044 15-3/4 Z+6 1/2 76.5 24 1/2 37 1/2
24.83 0.978 78 3.071 16 Z+7 77.0 38 1/2