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Number and letter sizes of drills - with decimal equivalents*
*Sizes starting with No. 80 and going up to 1 inch.

This table is useful for quickly determining the nearest drill size for any decimal, for root diameters, body drills, etc.
Drill# Frac. Dec.
80
79
--
78
77

76
75
74
73
72

71
70
69
68
--

67
66
65
64
63

62
61
60
59
58

57
56
--
55
54

53
--
52
51
50
49

48
--
47
46
45

44
43		 --
--
1/64
--
--

--
--
--
--
--

--
--
--
--
1/32

--
--
--
--
--

--
--
--
--
--

--
--
3/64
--
--

-
1/16
--
--
--
--

-
5/64
--
--
--

--
--		 .0135
.0145
.0156
.0160
.0180

.0200
.0210
.0225
.0240
.0250

.0260
.0280
.0292
.0310
.0312

.0320
.0330
.0350
.0360
.0370

.0380
.0390
.0400
.0410
.0420

.0430
.0465
.0469
.0520
.0550

.0595
.0625
.0635
.0670
.0700
.0730

.0760
.0781
.0785
.0810
.0820

.0860
.0890
Drill# Frac. Dec.
42
--
41
40
39

38
37
36
--
35

34
33
32
31
--

30
29
--
28
27

26
25
24
23
--

22
21
20
19
18

--
17
16
15
14

13
--
12
11
10

9
8
 --
3/32
--
--
--

--
--
--
7/64
--

--
--
--
--
1/8

--
--
9/64
--
--

--
--
--
--
5/32

--
--
--
--
--

11/64
--
--
--
--

--
3/16
--
--
--

--
--

 .0935
.0938
.0960
.0980
.0995

.1015
.1040
.1065
.1094
.1100

.1110
.1130
.1160
.1200
.1250

.1285
.1360
.1406
.1405
.1440

.1470
.1495
.1520
.1540
.1562

.1570
.1590
.1610
.1660
.1695

.1719
.1730
.1770
.1800
.1820

.1850
.1875
.1890
.1910
.1935

.1960
.1990
Drill# Frac. Dec.
7
--
6
5
4

3
--
2
1
A

--
8
C
D
--

E
F
0
--
H

I
J
--
K
L

M
--
N
--
0

P
--
0
R
--

S
T
--
U
--

V
W
--
 		--
13/64
--
--
--

--
7/32
--
--
--

15/64
--
--
--
1/4

--
--
--
17/64
--

--
--
9/32
--
--

--
19/64
--
5/16
--

--
21/64
--
--
11/32

--
--
23/64
--
3/8

--
--
25/64
 .2010
.2031
.2040
.2055
.2090

.2130
.2186
.2210
.2280
.2340

.2344
.2380
.2420
.2460
.2500

.2500
.2570
.2610
.2656
.2660

.2720
.2770
.2812
.2810
.2900

.2950
.2969
.3020
.3125
.3160

.3230
.3281
.3320
.3390
.3438

.3480
.3580
.3594
.3680
.3750

.3770
.3860
.3906
Drill# Frac. Dec.
X
Y
--
2
--

--
--
--
--
--

--
--
--
--
--

--
--
--
--
--

--
--
--
--
--

--
--
--
--
--

--
--
--
--
--

--
--
--
--
--

--
--
 		--
--
13/32
--
27/64

7/16
29/64
15/32
31/64
1/2

33/64
17/32
35/64
9/16
37/64

19/32
39/64
5/8
41/64
21/32

43/64
11/16
45/64
23/32
47/64

3/4
49/64
25/32
51/64
13/16

53/64
27/32
55/64
7/8
57/64

29/32
59/64
15/16
61/64
31/32

63/64
1
 .3970
.4040
.4062
.4130
.4219

.4375
.4531
.4688
.4844
.5000

.5156
.5312
.5469
.5625
.5781

.5938
.6094
.6250
.6406
.6562

.6719
.6875
.7031
.7188
.7344

.7500
.7656
.7812
.7969
.8125

.8281
.8438
.8594
.8750
.8906

.9062
.9219
.9375
.9531
.9688

.9844
1.0000
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