Scale conversions for drill bits

Drill bit Drill diameter Scale size
in mm 1/72 1/76 1/48 1/35
in mm in mm in mm in mm
80 .0135 .3429 0.972 24.6888 1.026 26.0604 0.648 16.4592 0.4725 12.0015
79 .0145 .3683 1.044 26.5176 1.102 27.9908 0.696 17.6784 0.5075 12.8905
1/64 " .015625 .3969 1.125 28.5768 1.1875 30.1644 0.75 19.0512 0.546875 13.8915
78 .016 .4064 1.152 29.2608 1.216 30.8864 0.768 19.5072 0.56 14.224
77 .018 .4572 1.296 32.9184 1.368 34.7472 0.864 21.9456 0.63 16.002
.5 mm .0197 .5 1.4184 36 1.4972 38 0.9456 24 0.6895 17.5
76 .02 .508 1.44 36.576 1.52 38.608 0.96 24.384 0.7 17.78
75 .021 .5334 1.512 38.4048 1.596 40.5384 1.008 25.6032 0.735 18.669
74 .0225 .5715 1.62 41.148 1.71 43.434 1.08 27.432 0.7875 20.0025
73 .024 .6096 1.728 43.8912 1.824 46.3296 1.152 29.2608 0.84 21.336
72 .025 .635 1.8 45.72 1.9 48.26 1.2 30.48 0.875 22.225
71 .026 .6604 1.872 47.5488 1.976 50.1904 1.248 31.6992 0.91 23.114
70 .028 .7112 2.016 51.2064 2.128 54.0512 1.344 34.1376 0.98 24.892


Drill bit Drill diameter Scale size
in mm 1/72 1/76 1/48 1/35
in mm in mm in mm in mm
69 .0292 .74168 2.1024 53.40096 2.2192 56.36768 1.4016 35.60064 1.022 25.9588
.75 mm .0295 .75 2.124 54 2.242 57 1.416 36 1.0325 26.25
68 .031 .7874 2.232 56.6928 2.356 59.8424 1.488 37.7952 1.085 27.559
1/32 " .03125 .7938 2.25 57.1536 2.375 60.3288 1.5 38.1024 1.09375 27.783
67 .032 .8128 2.304 58.5216 2.432 61.7728 1.536 39.0144 1.12 28.448
66 .033 .8382 2.376 60.3504 2.508 63.7032 1.584 40.2336 1.155 29.337
.85 mm .0335 .85 2.412 61.2 2.546 64.6 1.608 40.8 1.1725 29.75
65 .035 .889 2.52 64.008 2.66 67.564 1.68 42.672 1.225 31.115
64 .036 .9144 2.592 65.8368 2.736 69.4944 1.728 43.8912 1.26 32.004
63 .037 .9398 2.664 67.6656 2.812 71.4248 1.776 45.1104 1.295 32.893
.95 mm .0374 .95 2.6928 68.4 2.8424 72.2 1.7952 45.6 1.309 33.25
62 .038 .9652 2.736 69.4944 2.888 73.3552 1.824 46.3296 1.33 33.782
61 .039 .9906 2.808 71.3232 2.964 75.2856 1.872 47.5488 1.365 34.671
1 mm .0394 1 2.8368 72 2.9944 76 1.8912 48 1.379 35
60 .04 1.016 2.88 73.152 3.04 77.216 1.92 48.768 1.4 35.56


Drill bit Drill diameter Scale size
in mm 1/72 1/76 1/48 1/35
in mm in mm in mm in mm
59 .041 1.0414 2.952 74.9808 3.116 79.1464 1.968 49.9872 1.435 36.449
58 .042 1.0668 3.024 76.8096 3.192 81.0768 2.016 51.2064 1.47 37.338
57 .043 1.0922 3.096 78.6384 3.268 83.0072 2.064 52.4256 1.505 38.227
1.1 mm .0433 1.1 3.1176 79.2 3.2908 83.6 2.0784 52.8 1.5155 38.5
56 .0465 1.811 3.348 130.392 3.534 137.636 2.232 86.928 1.6275 63.385
3/64 " .046875 1.1906 3.375 85.7232 3.5625 90.4856 2.25 57.1488 1.640625 41.671
1.25 mm .0492 1.25 3.5424 90 3.7392 95 2.3616 60 1.722 43.75
1.3 mm .0512 1.3 3.6864 93.6 3.8912 98.8 2.4576 62.4 1.792 45.5
55 .052 1.3208 3.744 95.0976 3.952 100.3808 2.496 63.3984 1.82 46.228
54 .055 1.397 3.96 100.584 4.18 106.172 2.64 67.056 1.925 48.895
1.45 mm .0571 1.45 4.1112 104.4 4.3396 110.2 2.7408 69.6 1.9985 50.75
1.5 mm .0591 1.5 4.2552 108 4.4916 114 2.8368 72 2.0685 52.5
53 .0595 1.5113 4.284 108.8136 4.522 114.8588 2.856 72.5424 2.0825 52.8955
1/16 " .0625 1.5875 4.5 114.3 4.75 120.65 3 76.2 2.1875 55.5625
1.6 mm .063 1.6 4.536 115.2 4.788 121.6 3.024 76.8 2.205 56
52 .0635 1.6129 4.572 116.1288 4.826 122.5804 3.048 77.4192 2.2225 56.4515
51 .067 1.7018 4.824 122.5296 5.092 129.3368 3.216 81.6864 2.345 59.563
1.75 mm .0689 1.75 4.9608 126 5.2364 133 3.3072 84 2.4115 61.25
50 .07 1.778 5.04 128.016 5.32 135.128 3.36 85.344 2.45 62.23


Drill bit Drill diameter Scale size
in mm 1/72 1/76 1/48 1/35
in mm in mm in mm in mm
49 .073 1.8542 5.256 133.5024 5.548 140.9192 3.504 89.0016 2.555 64.897
48 .076 1.9304 5.472 138.9888 5.776 146.7104 3.648 92.6592 2.66 67.564
5/64 " .078125 1.9844 5.625 142.8768 5.9375 150.8144 3.75 95.2512 2.734375 69.454
47 .07826 1.9939 5.63472 143.5608 5.94776 151.5364 3.75648 95.7072 2.7391 69.7865
2 mm .0787 2 5.6664 144 5.9812 152 3.7776 96 2.7545 70
2.05 mm .0807 2.05 5.8104 147.6 6.1332 155.8 3.8736 98.4 2.8245 71.75
46 .081 2.0574 5.832 148.1328 6.156 156.3624 3.888 98.7552 2.835 72.009
45 .082 2.0828 5.904 149.9616 6.232 158.2928 3.936 99.9744 2.87 72.898
44 .086 2.1844 6.192 157.2768 6.536 166.0144 4.128 104.8512 3.01 76.454
43 .089 2.2606 6.408 162.7632 6.764 171.8056 4.272 108.5088 3.115 79.121
42 .0935 2.3749 6.732 170.9928 7.106 180.4924 4.488 113.9952 3.2725 83.1215
3/32 " .09375 2.3813 6.75 171.4536 7.125 180.9788 4.5 114.3024 3.28125 83.3455
41 .096 2.4384 6.912 175.5648 7.296 185.3184 4.608 117.0432 3.36 85.344
40 .098 2.4892 7.056 179.2224 7.448 189.1792 4.704 119.4816 3.43 87.122
2.5 mm .0984 2.5 7.0848 180 7.4784 190 4.7232 120 3.444 87.5