This table of equivalents should be useful for drill bit sizes, wrench and socket sizes, etc.

Inch/mm equivalents table

inch/64 Fractional inch Decimal inch mm
1 1/64 0.015625 0.396875
2 1/32 0.03125 0.79375
3 3/64 0.046875 1.190625
4 1/16 0.0625 1.5875
5 5/64 0.078125 1.984375
6 3/32 0.09375 2.38125
7 7/64 0.109375 2.778125
8 1/8 0.125 3.175
9 9/64 0.140625 3.571875
10 5/32 0.15625 3.96875
11 11/64 0.171875 4.365625
12 3/16 0.1875 4.7625
13 13/64 0.203125 5.159375
14 7/32 0.21875 5.55625
15 15/64 0.234375 5.953125
16 1/4 0.25 6.35
17 17/64 0.265625 6.746875
18 9/32 0.28125 7.14375
19 19/64 0.296875 7.540625
20 5/16 0.3125 7.9375
21 21/64 0.328125 8.334375
22 11/32 0.34375 8.73125
23 23/64 0.359375 9.128125
24 3/8 0.375 9.525
25 25/64 0.390625 9.921875
26 13/32 0.40625 10.31875
27 27/64 0.421875 10.715625
28 7/16 0.4375 11.1125
29 29/64 0.453125 11.509375
30 15/32 0.46875 11.90625
31 31/64 0.484375 12.303125
32 1/2 0.5 12.7
33 33/64 0.515625 13.096875
34 17/32 0.53125 13.49375
35 35/64 0.546875 13.890625
36 9/16 0.5625 14.2875
37 37/64 0.578125 14.684375
38 19/32 0.59375 15.08125
39 39/64 0.609375 15.478125
40 5/8 0.625 15.875
41 41/64 0.640625 16.271875
42 21/32 0.65625 16.66875
43 43/64 0.671875 17.065625
44 11/16 0.6875 17.4625
45 45/64 0.703125 17.859375
46 23/32 0.71875 18.25625
47 47/64 0.734375 18.653125
48 3/4 0.75 19.05
49 49/64 0.765625 19.446875
50 25/32 0.78125 19.84375
51 51/64 0.796875 20.240625
52 13/16 0.8125 20.6375
53 53/64 0.828125 21.034375
54 27/32 0.84375 21.43125
55 55/64 0.859375 21.828125
56 7/8 0.875 22.225
57 57/64 0.890625 22.621875
58 29/32 0.90625 23.01875
59 59/64 0.921875 23.415625
60 15/16 0.9375 23.8125
61 61/64 0.953125 24.209375
62 31/32 0.96875 24.60625
63 63/64 0.984375 25.003125