Decimal and Metric Equivalents of Drill Sizes

Drill Size

MM

Decimal Inches

Drill Size

MM

Decimal Inches

Drill Size

MM

Decimal Inches

-

0.10

.0039

-

3.00

.1181

R

8.61

.3390

-

0.20

.0079

31

3.05

.1200

11/32

8.73

.3438

-

0.25

.0098

1/8

3.18

.1250

S

8.84

.3480

-

0.30

.0118

30

3.26

.1285

-

9.00

.3543

80

0.34

.0135

29

3.45

.1360

T

9.09

.3580

79

0.37

.0145

28

3.57

.1405

23/64

9.13

.3594

1/64

0.40

.0156

9/64

3.57

.1406

U

9.35

.3680

78

0.41

.0160

27

3.66

.1440

3/8

9.53

.3750

77

0.46

.0180

26

3.73

.1470

V

9.56

.3770

-

0.50

.0197

25

3.80

.1495

W

9.80

.3860

76

0.51

.0200

24

3.86

.1520

25/64

9.92

.3906

75

0.53

.0210

23

3.91

.1540

-

10.00

.3937

74

0.57

.0225

5/32

3.97

.1562

X

10.08

.3970

-

0.60

.0236

22

3.99

.1570

Y

10.26

.4040

73

0.61

.0240

-

4.00

.1575

13/32

10.32

.4062

72

0.64

.0250

21

4.04

.1590

Z

10.49

.4130

71

0.66

.0260

20

4.09

.1610

27/64

10.72

.4219

-

0.70

.0276

19

4.22

.1660

-

11.00

.4331

70

0.71

.0280

18

4.31

.1695

7/16

11.11

.4375

69

0.74

.0292

11/64

4.37

.1719

29/64

11.51

.4531

-

0.75

.0295

17

4.39

.1730

15/32

11.91

.4688

68

0.79

.0310

16

4.50

.1770

-

12.00

.4724

1/32

0.79

.0313

15

4.57

.1800

31/64

12.30

.4844

-

0.80

.0315

14

4.62

.1820

1/2

12.70

.5000

67

0.81

.0320

13

4.70

.1850

-

13.00

.5118

66

0.84

.0330

3/16

4.76

.1875

33/64

13.10

.5156

65

0.89

.0350

12

4.80

.1890

17/32

13.49

.5312

-

0.90

.0354

11

4.85

.1910

35/64

13.89

.5469

64

0.91

.0360

10

4.91

.1935

-

14.00

.5512

63

0.94

.0370

9

4.98

.1960

9/16

14.29

.5625

62

0.97

.0380

-

5.00

.1968

37/64

14.68

.5781

61

0.99

.0390

8

5.05

.1990

-

15.00

.5906

-

1.00

.0394

7

5.11

.2010

19/32

15.08

.5938

60

1.02

.0400

13/64

5.16

.2031

39/64

15.48

.6094

59

1.04

.0410

6

5.18

.2040

5/8

15.88

.6250

58

1.07

.0420

5

5.22

.2055

-

16.00

.6299

57

1.09

.0430

4

5.31

.2090

41/64

16.27

.6406

56

1.18

.0465

3

5.41

.2130

21/32

16.67

.6562

3/64

1.19

.0469

7/32

5.56

.2188

-

17.00

.6693

55

1.32

.0520

2

5.61

.2210

43/64

17.07

.6719

54

1.40

.0550

1

5.79

.2280

11/16

17.46

.6875

53

1.51

.0595

A

5.94

.2340

45/64

17.86

.7031

1/16

1.59

.0625

15/64

5.95

.2344

-

18.00

.7087

52

1.61

.0635

-

6.00

.2362

23/32

18.26

.7188

51

1.70

.0670

B

6.05

.2380

47/64

18.65

.7344

50

1.78

.0700

C

6.15

.2420

-

19.00

.7480

49

1.85

.0730

D

6.25

.2460

3/4

19.05

.7500

48

1.93

.0760

1/4

6.35

.2500

49/64

19.45

.7656

5/64

1.98

.0781

E

6.35

.2500

25/32

19.84

.7812

47

1.99

.0785

F

6.53

.2570

-

20.00

.7874

-

2.00

.0787

G

6.63

.2610

51/64

20.24

.7969

46

2.06

.0810

17/64

6.75

.2656

13/16

20.64

.8125

45

2.08

.0820

H

6.76

.2660

-

21.00

.8268

44

2.18

.0860

I

6.91

.2720

53/64

21.03

.8281

43

2.26

.0890

-

7.00

.2756

27/32

21.43

.8438

42

2.37

.0935

J

7.04

.2770

55/64

21.84

.8594

3/32

2.38

.0938

K

7.14

.2810

-

22.00

.8661

41

2.44

.0960

9/32

7.14

.2812

7/8

22.23

.8750

40

2.50

.0980

L

7.37

.2900

57/64

22.62

.8906

39

2.53

.0995

M

7.49

.2950

-

23.00

.9055

38

2.58

.1015

19/64

7.54

.2969

29/32

23.02

.9062

37

2.64

.1040

N

7.67

.3020

59/64

23.42

.9219

36

2.71

.1065

5/16

7.94

.3125

15/16

23.81

.9375

7/64

2.78

.1094

-

8.00

.3150

-

24.00

.9449

35

2.79

.1100

O

8.03

.3160

61/64

24.21

.9531

34

2.82

.1110

P

8.20

.3230

31/32

24.61

.9688

33

2.87

.1130

21/64

8.33

.3281

-

25.00

.9842

32

2.95

.1160

Q

8.43

.3320

63/64

25.00

.9844

1"

25.40

1.0000