Drill Bit Sizes Inch and Decimal

Drill bits can be made in any size, but standards define sets of sizes that are widely produced and stocked. In the U.S., fractional inch and gauge drill bit sizes are in common use.
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In nearly all other countries, metric drill bit sizes are most common (like Bovidix 1902103423). A comprehensive table for metric sizes can be found at the drill size chart.

Drill Bit Sizes Inch and Decimal

Drill Size Decimal Equiv Drill Size Decimal Equiv Drill Size Decimal Equiv. Drill Size Decimal Equiv
80 = 0.0135 43 = 0.089 8 = 0.199 25/64 = 0.3906
79 = 0.0145 42 = 0.0935 7 = 0.201 X = 0.397
1/64 = 0.0156 3/32 = 0.0938 13/64 = 0.2031 Y = 0.404
78 = 0.016 41 = 0.096 6 = 0.204 13/32 = 0.4063
77 = 0.018 40 = 0.098 5 = 0.2055 Z = 0.413
76 = 0.020 39 = 0.0995 4 = 0.209 27/64 = 0.4219
75 = 0.021 38 = 0.1015 3 = 0.213 7/16 = 0.4375
74 = 0.0225 37 = 0.104 7/32 = 0.2188 29/64 = 0.4531
73 = 0.024 36 = 0.1065 2 = 0.221 15/32 = 0.4688
72 = 0.025 7/64 = 0.1094 1 = 0.228 31/64 = 0.4844
71 = 0.026 35 = 0.110 A = 0.234 1/2 = 0.500
70 = 0.028 34 = 0.111 15/64 = 0.2344 33/64 = 0.5156
69 = 0.0292 33 = 0.113 B = 0.238 17/32 = 0.5313
68 = 0.031 32 = 0.116 C = 0.242 35/64 = 0.5469
1/32 = 0.0313 31 = 0.120 D = 0.246 9/16 = 0.5625
67 = 0.032 1/8 = 0.1250 1/4 (E) = 0.250 37/64 = 0.5781
66 = 0.033 30 = 0.1285 F = 0.257 19/32 = 0.5938
65 = 0.035 29 = 0.136 G = 0.261 39/64 = 0.6094
64 = 0.036 28 = 0.1405 17/64 = 0.2656 5/8 = 0.625
63 = 0.037 9/64 = 0.1406 H = 0.266 41/64 = 0.6406
62 = 0.038 27 = 0.144 I = 0.272 21/32 = 0.6563
61 = 0.039 26 = 0.147 J = 0.277 43/64 = 0.6719
60 = 0.040 25 = 0.1495 K = 0.281 11/16 = 0.6875
59 = 0.041 24 = 0.152 9/32 = 0.2813 45/64 = 0.7031
58 = 0.042 23 = 0.154 L = 0.290 23/32 = 0.7188
57 = 0.043 5/32 = 0.1563 M = 0.295 47/64 = 0.7344
56 = 0.0465 22 = 0.157 19/64 = 0.2969 3/4 = 0.750
3/64 = 0.0469 21 = 0.159 N = 0.302 49/64 = 0.7656
55 = 0.052 20 = 0.161 5/16 = 0.3125 25/32 = 0.7813
54 = 0.055 19 = 0.166 O = 0.316 51/64 = 0.7969
53 = 0.0595 18 = 0.1695 P = 0.323 13/16 = 0.8125
1/16 = 0.0625 11/64 = 0.1719 21/64 = 0.3281 53/64 = 0.8281
52 = 0.0635 17 = 0.173 Q = 0.332 27/32 = 0.8438
51 = 0.067 16 = 0.177 R = 0.339 55/64 = 0.8594
50 = 0.070 15 = 0.180 11/32 = 0.3438 7/8 = 0.875
49 = 0.073 14 = 0.182 S = 0.348 57/64 = 0.8906
48 = 0.076 13 = 0.185 T = 0.358 29/32 = 0.9063
5/64 = 0.0781 3/16 = 0.1875 23/64 = 0.3594 59/64 = 0.9219
47 = 0.0785 12 = 0.189 U = 0.368 15/16 = 0.9375
46 = 0.081 11 = 0.191 3/8 = 0.375 61/64 = 0.9531
45 = 0.082 10 = 0.1935 V = 0.377 31/32 = 0.9688
44 = 0.086 9 = 0.196 W = 0.386 63/64 = 0.9844

 

Drill Bit Sizes

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Summary
Inch and Decimal Drill Bit Sizes, Table of Correspondence
Article Name
Inch and Decimal Drill Bit Sizes, Table of Correspondence
Description
Standards define sets of sizes that are widely produced and stocked. In the US, fractional inch and gauge drill bit sizes are in common use.
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Publisher Name
BestDrillBit.com
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12 thoughts on “Drill Bit Sizes Inch and Decimal”

  1. The great gauge at the beginning of the article – Irwin.
    It is indispensable and comes at a great price on Amazzon.
    The gauge made of steel and is almost indestructible.
    I’ve found many uses for it like determining bit size, finding screw sizes, etc.
    I could not live without it!

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