Band Size Conversion Nautical chart

Ring Size Conversion Charge

USA
Diameter
(mm)
Circumference
(mm)
Diameter
(inches)
Circumference
(inches)
Britain
Europe
Japan
0 11.54 36.25 0.454 1.427
eleven.nine 37.38 0.469 i.472 A
12 37.seven 0.472 1.484 0
12.1 38.01 0.476 1.496 A1/2
12.3 38.64 0.484 1.521 B
1 12.37 38.86 0.487 1.53
12.v 39.27 0.492 one.546 B1/2
1-1/iv 12.58 39.52 0.495 1.556
12.7 39.ix 0.5 1.571 C
1-i/2 12.78 40.15 0.503 one.581 0.xv
12.9 40.53 0.508 1.596 C1/2 0.53
1-three/iv 13 40.84 0.512 one.608 0.84 one
13.05 41 0.514 ane.614 one
13.1 41.15 0.516 1.62 D one.15
two 13.21 41.5 0.52 one.634 1.5
xiii.3 41.78 0.524 1.645 D1/2 ane.78
xiii.33 41.88 0.525 i.649 1.88 ii
13.37 42 0.526 1.654 2
two-ane/four 13.41 42.13 0.528 1.659 2.13
13.5 42.41 0.531 1.67 E 2.41
2-one/2 13.61 42.76 0.536 one.683 2.76
xiii.66 42.91 0.538 one.689 2.91 3
13.69 43 0.539 1.693 E1/two three
2-3/4 13.82 43.42 0.544 1.709 3.42
13.9 43.67 0.547 1.719 F 3.67
14 43.98 0.551 1.731 3.98 4
14.01 44 0.552 i.732 4
three 14.05 44.xiv 0.553 1.738 4.xiv
fourteen.1 44.3 0.555 ane.744 F1/2 4.3
3-1/4 xiv.24 44.74 0.561 one.761 4.74
fourteen.3 44.92 0.563 1.769 G 4.92
14.32 45 0.564 ane.772 5
fourteen.33 45.02 0.564 1.772 5.02 5
3-1/2 14.45 45.4 0.569 1.787 5.4
14.5 45.55 0.571 one.793 G1/two v.55
xiv.64 46 0.576 ane.811 6
3-3/four 14.65 46.02 0.577 1.812 6.02
14.66 46.06 0.577 1.813 6.06 6
14.7 46.18 0.579 1.818 H six.18
4 14.86 46.68 0.585 1.838 6.68
14.nine 46.81 0.587 1.843 H1/2 6.81
14.96 47 0.589 1.85 vii
15 47.12 0.591 ane.855 7.12 7
4-one/4 15.07 47.34 0.593 1.864 7.34
15.i 47.44 0.594 one.868 I 7.44
4-ane/2 15.27 47.97 0.601 1.889 7.97
15.28 48 0.602 1.89 8
15.3 48.07 0.602 1.893 I1/two eight.07
15.33 48.16 0.604 ane.896 8.sixteen 8
4-iii/4 fifteen.48 48.63 0.609 1.915 8.63
15.5 48.69 0.61 i.917 J 8.69
xv.half dozen 49 0.614 ane.929 9
15.66 49.two 0.617 ane.937 ix.two 9
5 xv.vii 49.32 0.618 1.942 J1/2 9.32
5-one/4 15.ix 49.95 0.626 1.967 One thousand 9.95
xv.92 fifty 0.627 one.969 x
16 50.27 0.63 ane.979 10.27 x
5-1/2 16.1 l.58 0.634 ane.991 K1/2 10.58
sixteen.23 51 0.639 2.008 xi
five-3/4 sixteen.31 51.24 0.642 2.017 L 11.24
sixteen.33 51.three 0.643 2.02 11.three 11
half dozen 16.51 51.87 0.65 two.042 L1/2 11.87
16.55 52 0.652 2.047 12
16.66 52.34 0.656 two.061 12.34 12
16.7 52.46 0.657 2.065 M 12.46
vi-i/iv 16.73 52.56 0.659 two.069 12.56
16.87 53 0.664 two.087 13
16.9 53.09 0.665 2.09 M1/2 13.09
6-1/2 16.92 53.16 0.666 2.093 xiii.16
17 53.41 0.669 2.103 13.41 xiii
17.1 53.72 0.673 2.115 N xiii.72
6-3/4 17.xiv 53.85 0.675 2.12 13.85
17.19 54 0.677 2.126 14
17.3 54.35 0.681 2.14 N1/ii xiv.35
17.33 54.44 0.682 2.143 14.44 xiv
7 17.35 54.51 0.683 ii.146 14.51
17.5 54.98 0.689 2.165 O fourteen.98
7-one/4 17.56 55 0.691 2.165 15
17.66 55.48 0.695 2.184 15.48 15
17.vii 55.61 0.697 two.189 O1/2 15.61
7-ane/2 17.75 55.76 0.699 two.195 fifteen.76
17.83 56 0.702 2.205 xvi
17.9 56.23 0.705 2.214 P sixteen.23
seven-3/four 17.97 56.45 0.707 ii.222 16.45
eighteen 56.55 0.709 2.226 xvi.55 16
18.i 56.86 0.713 2.239 P1/2 16.86
xviii.14 57 0.714 2.244 17
8 18.19 57.fifteen 0.716 2.25 17.15
18.3 57.49 0.72 2.263 Q 17.49
18.33 57.59 0.722 two.267 17.59 17
eight-1/4 18.39 57.77 0.724 two.274 17.77
18.46 58 0.727 two.283 eighteen
18.5 58.12 0.728 ii.288 Q1/2 18.12
8-i/ii xviii.59 58.4 0.732 two.299 18.4
18.66 58.62 0.735 2.308 eighteen.62 18
18.7 583/4 0.736 #VALUE! R 183/4
8-3/4 18.78 59 0.739 two.323 19
18.ix 59.38 0.744 ii.338 R1/2 19.38
ix 18.99 59.66 0.748 two.349 19.66
19 59.69 0.748 2.35 19.69 xix
19.ane lx 0.752 2.362 S 20
9-1/four 19.22 sixty.38 0.757 2.377 20.38
19.3 60.63 0.76 2.387 S1/2 20.63
19.33 threescore.73 0.761 2.391 twenty.73 20
ix-1/ii 19.41 60.98 0.764 ii.401 20.98
nineteen.42 61 0.765 2.402 21
19.5 61.26 0.768 2.412 T 21.26
9-iii/4 19.63 61.67 0.773 two.428 21.67
19.66 61.76 0.774 ii.431 21.76 21
19.7 61.89 0.776 2.437 T1/2 21.89
19.74 62 0.777 two.441 22
10 19.84 62.33 0.781 2.454 22.33
xix.9 62.52 0.783 2.461 U 22.52
twenty 62.83 0.787 2.474 22.83 22
10-i/four 20.05 63 0.789 two.48 23
20.1 63.15 0.791 ii.486 U1/2 23.15
x-1/two twenty.24 63.59 0.797 two.504 23.59
20.3 63.77 0.799 2.511 V 23.77
20.33 63.87 0.eight ii.515 23.87 23
twenty.37 63.99 0.802 2.519 23.99
10-iii/4 20.46 64.28 0.806 two.531 24.28
20.5 64.4 0.807 2.535 V1/two 24.4
20.66 64.91 0.813 2.556 24.91 24
11 twenty.68 64.97 0.814 2.558 24.97
xx.69 65 0.815 2.559 W 25
eleven-1/4 20.88 65.6 0.822 2.583 25.6
20.ix 65.66 0.823 2.585 W1/two 25.66
21 65.97 0.827 2.597 25.97 25
21.01 66 0.827 2.598 26
11-1/2 21.08 66.22 0.83 2.607 26.22
21.1 66.29 0.831 2.61 X 26.29
ten-3/4 21.3 66.92 0.839 ii.635 X1/ii 26.92
21.33 67.01 0.84 2.638 27.01 26
12 21.49 67.51 0.846 2.658 Y 27.51
21.65 68.02 0.852 2.678 28.02
21.66 68.05 0.853 2.679 28.05 27
12-1/4 21.71 68.two 0.855 2.685 Y1/2 28.two
12-one/2 21.89 68.77 0.862 ii.707 Z 28.77
21.96 68.99 0.865 2.716 28.99
22 69.12 0.866 two.721 29.12 28
22.ane 69.43 0.87 2.733 Z1/2 29.43
12-3/4 22.12 69.49 0.871 2.736 29.49
22.28 69.99 0.877 2.756 Z+1 29.99
13 22.33 70.xv 0.879 two.762 30.15 29
22.5 70.69 0.886 2.783 Z+11/2 30.69
13-i/four 22.54 70.81 0.887 2.788 30.81
22.6 71 0.89 2.795 31
22.66 71.nineteen 0.892 2.803 31.xix 30
22.7 71.31 0.894 ii.807 Z+two 31.31
13-1/ii 22.75 71.47 0.896 2.814 31.47
13-3/4 22.92 72.01 0.902 2.835 Z+21/2 32.01
23 72.26 0.906 ii.845 32.26 31
23.one 72.57 0.909 2.857 Z+3 32.57
fourteen 23.16 72.76 0.912 2.865 32.76
23.24 73.01 0.915 ii.874 33.01
23.three 73.two 0.917 two.882 Z+31/2 33.2
23.34 73.32 0.919 2.887 33.32
23.33 73.29 0.919 2.885 33.29 32
14-1/4 23.37 73.42 0.92 2.891 33.42
23.5 73.83 0.925 ii.907 Z+four 33.83
14-1/2 23.55 73.98 0.927 two.913 33.98
23.66 74.33 0.931 2.926 34.33 33
23.7 74.46 0.933 2.931 Z+41/2 34.46
14-3/4 23.78 74.71 0.936 two.941 34.71
23.87 74.99 0.94 two.952 34.99
23.9 75.08 0.941 2.956 Z+five 35.08
15 24 75.4 0.945 2.969 35.four 34
24.1 75.71 0.949 2.981 Z+51/ii 35.71
xv-1/4 24.xix 76 0.952 2.992 36
24.3 76.34 0.957 3.006 Z+6 36.34
24.33 76.43 0.958 3.009 36.43 35
xv-1/2 24.41 76.69 0.961 iii.019 36.69
24.51 77 0.965 3.031 Z+61/two 37
15-3/four 24.61 77.31 0.969 3.044 37.31
24.66 77.47 0.971 3.05 37.47 36
24.vii 77.6 0.972 3.055 Z+7 37.half dozen
xvi 24.83 78 0.978 3.071 38
24.nine 78.23 0.98 iii.08 Z+71/2 38.23
xvi-ane/4 25 78.54 0.984 three.092 38.54 37