Machinery's Handbook, 27th Edition

Mathematics

NUMBERS, FRACTIONS, AND DECIMALS

Table 1: Fractional and Decimal Inch to Millimeter, Exact [a] Values

Fractional Inch

Decimal Inch

Millimeters

Fractional Inch

Decimal Inch

Millimeters

1/64

0.015625

0.396875

0.511811024

13

1/32

0.03125

0.79375

33/64

0.515625

13.096875

0.039370079

1

17/32

0.53125

13.49375

3/64

0.046875

1.190625

35/64

0.546875

13.890625

1/16

0.0625

1.5875

0.551181102

14

5/64

0.078125

1.984375

9/16

0.5625

14.2875

0.078740157

2

37/64

0.578125

14.684375

1/12

0.08 33 [b]

2.11 66

7/12

0.58 33

14.81 66

3/32

0.09375

2.38125

0.590551181

15

7/64

0.109375

2.778125

19/32

0.59375

15.08125

0.118110236

3

39/64

0.609375

15.478125

1/8

0.125

3.175

5/8

0.625

15.875

9/64

0.140625

3.571875

0.62992126

16

5/32

0.15625

3.96875

41/64

0.640625

16.271875

0.157480315

4

21/32

0.65625

16.66875

1/6

0.1 66

4.2 33

2/3

0. 66

16.9 33

11/64

0.171875

4.365625

0.669291339

17

3/16

0.1875

4.7625

43/64

0.671875

17.065625

0.196850394

5

11/16

0.6875

17.4625

13/64

0.203125

5.159375

45/64

0.703125

17.859375

7/32

0.21875

5.55625

0.708661417

18

15/64

0.234375

5.953125

23/32

0.71875

18.25625

0.236220472

6

47/64

0.734375

18.653125

1/4

0.25

6.35

0.748031496

19

17/64

0.265625

6.746875

3/4

0.75

19.05

0.275590551

7

49/64

0.765625

19.446875

9/32

0.28125

7.14375

25/32

0.78125

19.84375

19/64

0.296875

7.540625

0.787401575

20

5/16

0.3125

7.9375

51/64

0.796875

20.240625

0.31496063

8

13/16

0.8125

20.6375

21/64

0.328125

8.334375

0.826771654

21

1/3

0. 33

8.4 66

53/64

0.828125

21.034375

11/32

0.34375

8.73125

27/32

0.84375

21.43125

0.354330709

9

55/64

0.859375

21.828125

23/64

0.359375

9.128125

0.866141732

22

3/8

0.375

9.525

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