Standard Drill Sizes - Decimal Equivalents



Drill
Size
Decimal
Equiv.
80 = .0135
79 = .0145
1/64 = .0156
78 = .016
77 = .018
76 = .020
75 = .021
74 = .0225
73 = .024
72 = .025
71 = .026
70 = .028
69 = .0292
68 = .031
1/32 = .0313
67 = .032
66 = .033
65 = .035
64 = .036
63 = .037
62 = .038
61 = .039
60 = .040
59 = .041
58 = .042
57 = .043
56 = .0465
3/64 = .0469
55 = .052
54 = .055
53 = .0595
1/16 = .0625
52 = .0635
51 = .067
50 = .070
49 = .073
48 = .076
5/64 = .0781
47 = .0785
46 = .081
45 = .082
44 = .086
Drill
Size
Decimal
Equiv.
43 = .089
42 = .0935
3/32 = .0938
41 = .096
40 = .098
39 = .0995
38 = .1015
37 = .104
36 = .1065
7/64 = .1094
35 = .110
34 = .111
33 = .113
32 = .116
31 = .120
1/8 = .125
30 = .1285
29 = .136
28 = .1405
9/64 = .1406
27 = .144
26 = .147
25 = .1495
24 = .152
23 = .154
5/32 = .1563
22 = .157
21 = .159
20 = .161
19 = .166
18 = .1695
11/64 = .1719
17 = .173
16 = .177
15 = .180
14 = .182
13 = .185
3/16 = .1875
12 = .189
11 = .191
10 = .1935
9 = .196
Drill
Size
Decimal
Equiv.
8 = .199
7 = .201
13/64 = .2031
6 = .204
5 = .2055
4 = .209
3 = .213
7/32 = .2188
2 = .221
1 = .228
A = .234
15/64 = .2344
B = .238
C = .242
D = .246
1/4 (E) = .250
F = .257
G = .261
17/64 = .2656
H = .266
I = .272
J = .277
K = .281
9/32 = .2813
L = .290
M = .295
19/64 = .2969
N = .302
5/16 = .3125
O = .316
P = .323
21/64 = .3281
Q = .332
R = .339
11/32 = .3438
S = .348
T = .358
23/64 = .3594
U = .368
3/8 = .375
V = .377
W = .386
Drill
Size
Decimal
Equiv.
25/64 = .3906
X = .397
Y = .404
13/32 = .4063
Z = .413
27/64 = .4219
7/16 = .4375
29/64 = .4531
15/32 = .4688
31/64 = .4844
1/2 = .500
33/64 = .5156
17/32 = .5313
35/64 = .5469
9/16 = .5625
37/64 = .5781
19/32 = .5938
39/64 = .6094
5/8 = .625
41/64 = .6406
21/32 = .6563
43/64 = .6719
11/16 = .6875
45/64 = .7031
23/32 = .7188
47/64 = .7344
3/4 = .750
49/64 = .7656
25/32 = .7813
51/64 = .7969
13/16 = .8125
53/64 = .8281
27/32 = .8438
55/64 = .8594
7/8 = .875
57/64 = .8906
29/32 = .9063
59/64 = .9219
15/16 = .9375
61/64 = .9531
31/32 = .9688
63/64 = .9844