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General Information, Facts & Tables
[Inch - mm Table]

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Overview

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The table below shows the relationship between common fractional and decimal inch measurements their millimetre equivalents.
 

Inch - mm Table

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Fractional

Decimal

millimetre

1/64

0.015 625

0.396 875

1/32, 2/64

0.031 250

0.793 750

 

0.039 370

1.000 000

3/64

0.046 875

1.190 625

1/16, 2/32, 4/64

0.062 500

1.587 500

5/64

0.078 125

1.984 375

 

0.078 740

2.000 000

3/32, 6/64

0.093 750

2.381 250

 

0.100 000

2.540 000

7/64

0.109 375

2.778 125

 

0.118 110

3.000 000

1/ 8, 2/16, 4/32, 8/64

0.125 000

3.175 000

9/64

0.140 625

3.571 875

5/32, 10/64

0.156 250

3.968 750

 

0.157 480

4.000 000

11/64

0.171 875

4.365 625

3/16, 6/32, 12/64

0.187 500

4.762 500

 

0.196 850

5.000 000

 

0.200 000

5.080 000

13/64

0.203 125

5.159 375

7/32, 14/64

0.218 750

5.556 250

15/64

0.234 375

5.953 125

 

0.236 220

6.000 000

1/ 4, 2/8, 4/16, 8/32, 16/64

0.250 000

6.350 000

17/64

0.265 625

6.746 875

 

0.275 591

7.000 000

9/32, 18/64

0.281 250

7.143 750

19/64

0.296 875

7.540 625

 

0.300 000

7.620 000

5/16, 10/32, 20/64

0.312 500

7.937 500

 

0.314 961

8.000 000

21/64

0.328 125

8.334 375

11/32, 2/64

0.343 750

8.731 250

 

0.354 331

9.000 000

23/64

0.359 375

9.128 125

3/8, 6/16, 12/32, 24/64

0.375 000

9.525 000

25/64

0.390 625

9.921 875

 

0.393 701

10.000 000

 

0.400 000

10.160 000

13/32, 26/64

0.406 250

10.318 750

27/64

0.421 875

10.715 625

 

0.433 071

11.000 000

7/16, 14/32, 28/64

0.437 500

11.112 500

29/64

0.453 125

11.509 375

15/32, 30/64

0.468 750

11.906 250

 

0.472 441

12.000 000

31/64

0.484 375

12.303 125

1/ 2, 2/4, 4/8, 8/16, 16/32, 32/64

0.500 000

12.700 000

 

0.511 811

13.000 000

33/64

0.515 625

13.096 875

17/32, 34/64

0.531 250

13.493 750

35/64

0.546 875

13.890 625

 

0.551 181

14.000 000

9/16, 18/32, 36/64

0.562 500

14.287 500

37/64

0.578 125

14.684 375

 

0.590 551

15.000 000

19/32, 38/64

0.593 750

15.081 250

 

0.600 000

15.240 000

39/64

0.609 375

15.478 125

5/8, 10/16, 20/32, 40/64

0.625 000

15.875 000

 

0.629 921

16.000 000

41/64

0.640 625

16.271 875

21/32, 42/64

0.656 250

16.668 750

 

0.669 291

17.000 000

43/64

0.671 875

17.065 625

11/16, 22/32, 44/64

0.687 500

17.462 500

 

0.700 000

17.780 000

45/64

0.703 125

17.859 375

 

0.708 661

18.000 000

23/32, 46/64

0.718 750

18.256 250

47/64

0.734 375

18.653 125

 

0.748 031

19.000 000

3/4, 6/8, 12/16, 24/32, 48/64

0.750 000

19.050 000

49/64

0.765 625

19.446 875

25/32, 50/64

0.781 250

19.843 750

 

0.787 402

20.000 000

51/64

0.796 875

20.240 625

 

0.800 000

20.320 000

13/16, 26/32, 52/64

0.812 500

20.637 500

 

0.826 772

21.000 000

53/64

0.828 125

21.034 375

27/32, 54/64

0.843 750

21.431 250

55/64

0.859 375

21.828 125

 

0.866 142

22.000 000

7/8, 14/16, 28/32, 56/64

0.875 000

22.225 000

57/64

0.890 625

22.621 875

 

0.900 000

22.860 000

 

0.905 512

23.000 000

29/32, 58/64

0.906 250

23.018 750

59/64

0.921 875

23.415 625

15/16, 30/32, 60/64

0.937 500

23.812 500

 

0.944 882

24.000 000

61/64

0.953 125

24.209 375

31/32, 62/64

0.968 750

24.606 250

 

0.984 252

25.000 000

63/64

0.984 375

25.003 125

1/1

 1.000 000

 25.400 000