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Drill Bit Size Charts

This drill bit size chart provides a list of sizes in several measurement systems, including fractional, metric, wire gauge number, and letter.

Fractional Drill Bit Size Chart


Drill size

Diameter (in)

Diameter (mm)

1/64 in

0.0156

0.3969

1/32 in

0.0313

0.7938

3/64 in

0.0469

1.1906

1/16 in

0.0625

1.5875

5/64 in

0.0781

1.9844

3/32 in

0.0938

2.3813

7/64 in

0.1094

2.7781

1/8 in

0.125

3.175

9/64 in

0.1406

3.5719

5/32 in

0.1563

3.9688

11/64 in

0.1719

4.3656

3/16 in

0.1875

4.7625

13/64 in

0.2031

5.1594

7/32 in

0.2188

5.5563

15/64 in

0.2344

5.9531

1/4 in

0.25

6.35

17/64 in

0.2656

6.7469

9/32 in

0.2813

7.1438

19/64 in

0.2969

7.5406

5/16 in

0.3125

7.9375

21/64 in

0.3281

8.3344

11/32 in

0.3438

8.7313

23/64 in

0.3594

9.1281

3/8 in

0.375

9.525

25/64 in

0.3906

9.9219

13/32 in

0.4063

10.3188

27/64 in

0.4219

10.7156

7/16 in

0.4375

11.1125

29/64 in

0.4531

11.5094

15/32 in

0.4688

11.9063

31/64 in

0.4844

12.3031

1/2 in

0.5

12.7

33/64 in

0.5156

13.0969

17/32 in

0.5313

13.4938

35/64 in

0.5469

13.8906

9/16 in

0.5625

14.2875

37/64 in

0.5781

14.6844

19/32 in

0.5938

15.0813

39/64 in

0.6094

15.4781

5/8 in

0.625

15.875

41/64 in

0.6406

16.2719

43/64 in

0.6719

17.0656

11/16 in

0.6875

17.4625

45/64 in

0.7031

17.8594

23/32 in

0.7188

18.2563

47/64 in

0.7344

18.6531

3/4 in

0.75

19.05

49/64 in

0.7656

19.4469

25/32 in

0.7813

19.8438

51/64 in

0.7969

20.2406

13/16 in

0.8125

20.6375

53/64 in

0.8281

21.0344

27/32 in

0.8438

21.4313

55/64 in

0.8594

21.8281

7/8 in

0.875

22.225

57/64 in

0.8906

22.6219

29/32 in

0.9063

23.0188

21/23 in

0.913

23.1913

59/64 in

0.9219

23.4156

15/16 in

0.9375

23.8125

61/64 in

0.9531

24.2094

31/32 in

0.9688

24.6063

63/64 in

0.9844

25.0031

1 in

1

25.4

1 1/64 in

1.0156

25.7969

1 1/32 in

1.0313

26.1938

1 3/64 in

1.0469

26.5906

1 1/16 in

1.0625

26.9875

1 5/64 in

1.0781

27.3844

1 3/32 in

1.0938

27.7813

1 7/64 in

1.1094

28.1781

1 1/8 in

1.125

28.575

1 9/64 in

1.1406

28.9719

1 5/32 in

1.1563

29.3688

1 11/64 in

1.1719

29.7656

1 3/16 in

1.1875

30.1625

1 13/64 in

1.2031

30.5594

1 7/32 in

1.2188

30.9563

1 15/64 in

1.2344

31.3531

1 1/4 in

1.25

31.75

1 17/64 in

1.2656

32.1469

1 9/32 in

1.2813

32.5438

1 19/64 in

1.2969

32.9406

1 5/16 in

1.3125

33.3375

1 21/64 in

1.3281

33.7344

1 11/32 in

1.3438

34.1313

1 23/64 in

1.3594

34.5281

1 3/8 in

1.375

34.925

1 25/64 in

1.3906

35.3219

1 13/32 in

1.4063

35.7188

1 27/64 in

1.4219

36.1156

1 7/16 in

1.4375

36.5125

1 29/64 in

1.4531

36.9094

1 15/32 in

1.4688

37.3063

1 31/64 in

1.4844

37.7031

1 1/2 in

1.5

38.1


Metric Drive Size Chart


Drill size

Diameter (in)

Diameter (mm)

0.05 mm

0.002

0.05

0.1 mm

0.0039

0.1

0.2 mm

0.0079

0.2

0.3 mm

0.0118

0.3

0.4 mm

0.0158

0.4

0.5 mm

0.0197

0.5

0.6 mm

0.0236

0.6

0.7 mm

0.0276

0.7

0.8 mm

0.0315

0.8

0.9 mm

0.0354

0.9

1 mm

0.0394

1

1.1 mm

0.0433

1.1

1.2 mm

0.0472

1.2

1.3 mm

0.0512

1.3

1.4 mm

0.0551

1.4

1.5 mm

0.0591

1.5

1.6 mm

0.063

1.6

1.7 mm

0.0669

1.7

1.8 mm

0.0709

1.8

1.9 mm

0.0748

1.9

2 mm

0.0787

2

2.1 mm

0.0827

2.1

2.2 mm

0.0866

2.2

2.3 mm

0.0906

2.3

2.4 mm

0.0945

2.4

2.5 mm

0.0984

2.5

2.6 mm

0.1024

2.6

2.7 mm

0.1063

2.7

2.8 mm

0.1102

2.8

2.9 mm

0.1142

2.9

3 mm

0.1181

3

3.1 mm

0.1221

3.1

3.2 mm

0.126

3.2

3.3 mm

0.1299

3.3

3.4 mm

0.1339

3.4

3.5 mm

0.1378

3.5

3.6 mm

0.1417

3.6

3.7 mm

0.1457

3.7

3.8 mm

0.1496

3.8

3.9 mm

0.1535

3.9

4 mm

0.1575

4

4.1 mm

0.1614

4.1

4.2 mm

0.1654

4.2

4.3 mm

0.1693

4.3

4.4 mm

0.1732

4.4

4.5 mm

0.1772

4.5

4.6 mm

0.1811

4.6

4.7 mm

0.185

4.7

4.8 mm

0.189

4.8

4.9 mm

0.1929

4.9

5 mm

0.1969

5

5.1 mm

0.2008

5.1

5.2 mm

0.2047

5.2

5.3 mm

0.2087

5.3

5.4 mm

0.2126

5.4

5.5 mm

0.2165

5.5

5.6 mm

0.2205

5.6

5.7 mm

0.2244

5.7

5.8 mm

0.2284

5.8

5.9 mm

0.2323

5.9

6 mm

0.2362

6

6.1 mm

0.2402

6.1

6.2 mm

0.2441

6.2

6.3 mm

0.248

6.3

6.4 mm

0.252

6.4

6.5 mm

0.2559

6.5

6.6 mm

0.2598

6.6

6.7 mm

0.2638

6.7

6.8 mm

0.2677

6.8

6.9 mm

0.2717

6.9

7 mm

0.2756

7

7.1 mm

0.2795

7.1

7.2 mm

0.2835

7.2

7.3 mm

0.2874

7.3

7.4 mm

0.2913

7.4

7.5 mm

0.2953

7.5

7.6 mm

0.2992

7.6

7.7 mm

0.3032

7.7

7.8 mm

0.3071

7.8

7.9 mm

0.311

7.9

8 mm

0.315

8

8.1 mm

0.3189

8.1

8.2 mm

0.3228

8.2

8.3 mm

0.3268

8.3

8.4 mm

0.3307

8.4

8.5 mm

0.3347

8.5

8.6 mm

0.3386

8.6

8.7 mm

0.3425

8.7

8.8 mm

0.3465

8.8

8.9 mm

0.3504

8.9

9 mm

0.3543

9

9.1 mm

0.3583

9.1

9.2 mm

0.3622

9.2

9.3 mm

0.3661

9.3

9.4 mm

0.3701

9.4

9.5 mm

0.374

9.5

9.6 mm

0.378

9.6

9.7 mm

0.3819

9.7

9.8 mm

0.3858

9.8

9.9 mm

0.3898

9.9

10 mm

0.3937

10

10.5 mm

0.4134

10.5

11 mm

0.4331

11

11.5 mm

0.4528

11.5

12 mm

0.4724

12

12.5 mm

0.4921

12.5

13 mm

0.5118

13

13.5 mm

0.5315

13.5

14 mm

0.5512

14

14.5 mm

0.5709

14.5

15 mm

0.5906

15

15.5 mm

0.6102

15.5

16 mm

0.6299

16

16.5 mm

0.6496

16.5

17 mm

0.6693

17

17.5 mm

0.689

17.5

18 mm

0.7087

18

18.5 mm

0.7284

18.5

19 mm

0.748

19

19.5 mm

0.7677

19.5

20 mm

0.7874

20

20.5 mm

0.8071

20.5

21 mm

0.8268

21

21.5 mm

0.8465

21.5

22 mm

0.8661

22

22.5 mm

0.8858

22.5

23 mm

0.9055

23

23.5 mm

0.9252

23.5

24 mm

0.9449

24

24.5 mm

0.9646

24.5

25 mm

0.9843

25

25.5 mm

1.0039

25.5

26 mm

1.0236

26

26.5 mm

1.0433

26.5

27 mm

1.063

27

27.5 mm

1.0827

27.5

28 mm

1.1024

28

28.5 mm

1.1221

28.5

29 mm

1.1417

29

29.5 mm

1.1614

29.5

30 mm

1.1811

30

30.5 mm

1.2008

30.5

31 mm

1.2205

31

31.5 mm

1.2402

31.5

32 mm

1.2598

32

32.5 mm

1.2795

32.5

33 mm

1.2992

33

33.5 mm

1.3189

33.5

34 mm

1.3386

34

34.5 mm

1.3583

34.5

35 mm

1.378

35

35.5 mm

1.3976

35.5

36 mm

1.4173

36

36.5 mm

1.437

36.5

37 mm

1.4567

37

37.5 mm

1.4764

37.5

38 mm

1.4961

38

Letter Drill Bit Sizes

Drill

Inch

mm

A

0.234

5.94

B

0.238

6.05

C

0.242

6.15

D

0.246

6.25

E

0.25

6.35

F

0.257

6.53

G

0.261

6.63

H

0.266

6.76

I

0.272

6.91

J

0.277

7.04

K

0.281

7.14

L

0.29

7.37

M

0.295

7.49

N

0.302

7.67

O

0.316

8.03

P

0.323

8.2

Q

0.332

8.43

R

0.339

8.61

S

0.348

8.84

T

0.358

9.09

U

0.368

9.35

V

0.377

9.58

W

0.386

9.8

X

0.397

10.08

Y

0.404

10.26

Z

0.413

10.49

Wire Gauge Size Chart

Drill size

Diameter (in)

Diameter (mm)

#107

0.0019

0.0483

#106

0.0023

0.0584

#105

0.0027

0.0686

#104

0.0031

0.0787

#103

0.0035

0.0889

#102

0.0039

0.0991

#101

0.0043

0.1092

#100

0.0047

0.1194

#99

0.0051

0.1295

#98

0.0055

0.1397

#97

0.0059

0.1499

#96

0.0063

0.16

#95

0.0067

0.1702

#94

0.0071

0.1803

#93

0.0075

0.1905

#92

0.0079

0.2007

#91

0.0083

0.2108

#90

0.0087

0.221

#89

0.0091

0.2311

#88

0.0095

0.2413

#87

0.01

0.254

#86

0.0105

0.2667

#85

0.011

0.2794

#84

0.0115

0.2921

#83

0.012

0.3048

#82

0.0125

0.3175

#81

0.013

0.3302

#80

0.0135

0.3429

#79

0.0145

0.368

#78

0.016

0.4064

#77

0.018

0.4572

#76

0.02

0.508

#75

0.021

0.5334

#74

0.0225

0.5715

#73

0.024

0.6096

#72

0.025

0.635

#71

0.026

0.6604

#70

0.028

0.7112

#69

0.0292

0.7417

#68

0.031

0.7874

#67

0.032

0.8128

#66

0.033

0.8382

#65

0.035

0.889

#64

0.036

0.9144

#63

0.037

0.9398

#62

0.038

0.9652

#61

0.039

0.9906

#60

0.04

1.016

#59

0.041

1.0414

#58

0.042

1.0668

#57

0.043

1.0922

#56

0.0465

1.1811

#55

0.052

1.3208

#54

0.055

1.397

#53

0.0595

1.5113

#52

0.0635

1.6129

#51

0.067

1.7018

#50

0.07

1.778

#49

0.073

1.8542

#48

0.076

1.9304

#47

0.0785

1.9939

#46

0.081

2.0574

#45

0.082

2.0828

#44

0.086

2.1844

#43

0.089

2.2606

#42

0.0935

2.3749

#41

0.096

2.4384

#40

0.098

2.4892

#39

0.0995

2.5273

#38

0.1015

2.5781

#37

0.104

2.6416

#36

0.1065

2.7051

#35

0.11

2.794

#34

0.111

2.8194

#33

0.113

2.8702

#32

0.116

2.9464

#31

0.12

3.048

#30

0.1285

3.2639

#29

0.136

3.4544

#28

0.1405

3.5687

#27

0.144

3.6576

#26

0.147

3.7338

#25

0.1495

3.7973

#24

0.152

3.8608

#23

0.154

3.9116

#22

0.157

3.9878

#21

0.159

4.0386

#20

0.161

4.0894

#19

0.166

4.2164

#18

0.1695

4.3053

#17

0.173

4.3942

#16

0.177

4.4958

#15

0.18

4.572

#14

0.182

4.6228

#13

0.185

4.699

#12

0.189

4.8006

#11

0.191

4.8514

#10

0.1935

4.9149

#9

0.196

4.9784

#8

0.199

5.0546

#7

0.201

5.1054

#6

0.204

5.1816

#5

0.2055

5.2197

#4

0.209

5.3086

#3

0.213

5.4102

#2

0.221

5.6134

#1

0.228

5.7912


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