Conversion from Fractional Inches to Millimeters

inch

mm

1/64

0.015 625

0.396 875

1/32

0.031 250

0.793 750

3/64

0.046 875

1.190 625

1/16

0.062 500

1.587 500

5/64

0.078 125

1.984 375

3/32

0.093 125

2.381 250

7/64

0.109 375

2.778 125

1/8

0.125 000

3.175 000

9/64

0.140 625

3.571 875

5/32

0.156 250

3.968 750

11/64

0.171 875

4.365 625

3/16

0.187 500

4.762 500

13/64

0.203 125

5.159 375

7/32

0.218 750

5.556 250

15/64

0.234 375

5.953 125

1/4

0.250 000

6.350 000

17/64

0.265 625

6.746 875

9/32

0.281 250

7.143 750

19/64

0.296 875

7.540 625

5/16

0.312 500

7.937 500

21/64

0.328 125

8.334 375

 

inch

mm

11/32

0.343 750

8.731 250

23/64

0.359 375

9.128 125

3/8

0.375 000

9.525 000

25/64

0.390 625

9.921 875

13/32

0.406 250

10.318 750

27/64

0.421 875

11.112 500

7/16

0.437 500

11.509 375

29/64

0.453 125

11.906 250

15/32

0.468 750

12.303 125

31/64

0.484 375

12.303 125

1/2

0.500 000

12.700 000

33/64

0.515 625

13.096 875

17/32

0.531 250

13.493 750

35/64

0.546 875

13.890 625

9/16

0.562 500

14.287 500

37/64

0.578 125

14.684 375

19/32

0.593 750

15.081 250

39/64

0.609 375

15.478 125

5/8

0.625 000

15.875 000

41/64

0.640 625

16.271 875

21/32

0.656 250

16.668 750

 

inch

mm

43/64

0.671 875

17.065 625

11/16

0.687 500

17.462 500

45/64

0.703 125

17.859 375

23/32

0.718 750

18.256 250

47/64

0.734 375

18.653 125

3/4

0.750 000

19.050 000

49/64

0.765 625

19.446 875

25/32

0.781 250

19.843 750

51/64

0.796 875

20.240 625

13/16

0.812 500

20.637 500

53/64

0.828 125

21.034 375

27/32

0.843 750

21.431 250

55/64

0.859 375

21.828 125

7/8

0.875 000

22.225 000

57/64

0.890 625

22.621 875

29/32

0.906 250

23.018 750

59/64

0.921 875

23.415 625

15/16

0.937 500

23.812 500

61/64

0.953 125

24.209 375

31/32

0.968 750

24.606 250

63/64

0.984 375

25.003 125

1

1.000 000

25.400 000

 

NOTE: All values in this table are exact.

 

 

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Page Edited On: 30-Dec-02