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Drill Bits - Conversion Chart

Convert between drill bit dimensions - gauge numbers, inches and mm.

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Drill bit

Convert between drill bit no. (or gauge), inches and mm.

Drill Bits - Conversion Chart
Drill Bit Size
Gauge
(no.)
(inches) (inches)(mm)
104 0.0031 0.079
103 0.0035 0.089
102 0.0039 0.099
101 0.0043 0.109
100 0.0047 0.119
99 0.0051 0.130
98 0.0055 0.140
97 0.0059 0.150
96 0.0063 0.160
95 0.0067 0.170
94 0.0071 0.180
93 0.0075 0.191
92 0.0079 0.201
91 0.0083 0.211
90 0.0087 0.221
89 0.0091 0.231
88 0.0095 0.241
87 0.0100 0.254
86 0.0105 0.267
85 0.0110 0.279
84 0.0115 0.292
83 0.0120 0.305
82 0.0125 0.318
81 0.0130 0.330
80 0.0135 0.343
79 0.0145 0.368
78 0.0160 0.406
77 0.0180 0.457
76 0.0200 0.508
75 0.0210 0.533
74 0.0225 0.572
73 0.0240 0.610
72 0.0250 0.635
71 0.0260 0.660
70 0.0280 0.711
69 0.0292 0.742
68 0.0310 0.787
1/32 0.0313 0.794
67 0.0320 0.813
66 0.0330 0.838
65 0.0350 0.889
64 0.0360 0.914
63 0.0370 0.940
62 0.0380 0.965
61 0.0390 0.991
60 0.0400 1.016
59 0.0410 1.041
58 0.0420 1.067
57 0.0430 1.092
56 0.0465 1.181
3/64 0.0469 1.191
55 0.0520 1.321
54 0.0550 1.397
53 0.0595 1.511
1/16 0.0625 1.587
52 0.0635 1.613
51 0.0670 1.702
50 0.0700 1.778
49 0.0730 1.854
48 0.0760 1.930
5/64 0.0781 1.984
47 0.0785 1.994
46 0.0810 2.057
45 0.0820 2.083
44 0.0860 2.184
43 0.0890 2.261
42 0.0935 2.375
3/32 0.0938 2.381
41 0.0960 2.438
40 0.0980 2.489
39 0.0995 2.527
38 0.102 2.578
37 0.104 2.642
36 0.107 2.705
7/64 0.1094 2.778
35 0.110 2.794
34 0.111 2.819
33 0.113 2.870
32 0.116 2.946
31 0.120 3.048
1/8 0.125 3.175
30 0.129 3.264
29 0.136 3.454
28 0.141 3.569
9/64 0.1406 3.572
27 0.144 3.658
26 0.147 3.734
25 0.150 3.797
24 0.152 3.861
23 0.154 3.912
5/32 0.1563 3.969
22 0.157 3.988
21 0.159 4.039
20 0.161 4.089
19 0.166 4.216
18 0.170 4.305
11/64 0.1719 4.366
17 0.173 4.394
16 0.177 4.496
15 0.180 4.572
14 0.182 4.623
13 0.185 4.699
3/16 0.1875 4.762
12 0.189 4.801
11 0.191 4.851
10 0.194 4.915
9 0.196 4.978
8 0.199 5.055
7 0.201 5.105
13/64 0.2031 5.159
6 0.204 5.182
5 0.206 5.220
4 0.209 5.309
3 0.213 5.410
7/32 0.2188 5.556
2 0.221 5.613
1 0.228 5.791
A 0.234 5.944
15/64 0.2344 5.953
B 0.238 6.045
C 0.242 6.147
D 0.246 6.248
E 1/4 0.250 6.350
F 0.257 6.528
G 0.261 6.629
17/64 0.2656 6.747
H 0.266 6.756
I 0.272 6.909
J 0.277 7.036
K 0.281 7.137
9/32 0.2813 7.144
L 0.290 7.366
M 0.295 7.493
19/64 0.2969 7.541
N 0.302 7.671
5/16 0.3150 8.000
O 0.316 8.026
P 0.323 8.204
21/64 0.3281 8.334
Q 0.332 8.433
R 0.339 8.611
11/32 0.3438 8.731
S 0.348 8.839
T 0.358 9.093
23/64 0.3594 9.128
U 0.368 9.347
3/8 0.3750 9.525
V 0.377 9.576
W 0.386 9.804
25/64 0.3906 9.922
X 0.397 10.08
Y 0.404 10.26
13/32 0.4063 10.319
Z 0.413 10.49
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