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Decimal, Fraction & Metric Conversion Chart
To Convert Inches To Millimeters - Multiply Decimal by 25.4
Fraction
/MM
Decimals MM   Fraction
/MM
Decimals MM   Fraction
/MM
Decimals MM   Fraction
/MM
Decimals MM
1/64 .0156 .3969 6.5mm .2559 6.500 13mm .5118 13.000 49/64 .7656 19.446
1/32 .0313 .7938 17/64 .2656 6.746 33/64 .5156 13.096 19.5mm .7677 19.500
1mm .0394 1.000 7mm .2756 7.000 17/32 .5313 13.493 25/32 .7813 19.843
3/64 .0469 1.190 9/32 .2813 7.143 13.5mm .5315 13.500 20mm .7874 20.000
1.5mm .0591 1.500 7.5mm .2953 7.500 35/64 .5469 13.890 51/64 .7969 20.240
1/16 .0625 1.587 19/64 .2969 7.540 14mm .5512 14.000 20.5mm .8071 20.500
5/64 .0781 1.984 5/16 .3125 7.937 9/16 .5625 14.287 13/16 .8125 20.637
2mm .0787 2.000 8mm .3150 8.000 14.5mm .5709 14.500 21mm .8268 21.000
3/32 .0938 2.381 21/64 .3281 8.334 37/64 .5781 14.684 53/64 .8281 21.034
2.5mm .0984 2.500 8.5mm .3346 8.500 15mm .5906 15.000 27/32 .8438 21.431
7/64 .1094 2.778 11/32 .3438 8.731 19/32 .5937 15.081 21.5mm .8465 21.500
3mm .1181 3.000 9mm .3543 9.000 39/64 .6094 15.478 55/64 .8594 21.828
1/8 .125 3.175 23/64 .3594 9.128 15.5mm .6102 15.500 22mm .8661 22.000
3.5mm .1378 3.500 9.5mm .3740 9.500 5/8 .625 15.875 7/8 .875 22.225
9/64 .1406 3.571 3/8 .375 9.525 16mm .6299 16.000 22.5mm .8858 22.500
5/32 .1563 3.968 25/64 .3906 9.921 41/64 .6406 16.271 57/64 .8906 22.621
4mm .1575 4.000 10mm .3937 10.000 16.5mm .6496 16.500 23mm .9055 23.000
11/64 .1719 4.365 13/32 .4063 10.318 21/32 .6563 16.668 29/32 .9062 23.018
4.5mm .1772 4.500 10.5mm .4134 10.500 17mm .6693 17.000 59/64 .9219 23.415
3/16 .1875 4.762 27/64 .4219 10.715 43/64 .6719 17.065 23.5mm .9252 23.500
5mm .1969 5.000 11mm .4331 11.000 11/16 .6875 17.462 15/16 .9375 23.812
13/64 .2031 5.159 7/16 .4375 11.112 17.5mm .6890 17.500 24mm .9449 24.000
5.5mm .2165 5.500 11.5mm .4528 11.500 45/64 .7031 17.859 61/64 .9531 24.209
7/32 .2188 5.556 29/64 .4531 11.509 18mm .7087 18.000 24.5mm .9646 24.500
15/64 .2344 5.953 15/32 .4688 11.906 23/32 .7188 18.256 31/32 .9688 24.606
6mm .2362 6.000 12mm .4724 12.000 18.5mm .7283 18.500 25mm .9843 25.000
1/4 .250 6.350 31/64 .4844 12.303 47/64 .7344 18.653 63/64 .9844 25.003
12.5mm .4921 12.500 19mm .7480 19.000 1 inch 1.000 25.400
1/2 .500 12.700 3/4 .750 19.050

UNICORP Precision Fasteners & Custom Electronic Hardware
291 Cleveland Street, Orange, New Jersey  07050  USA     Tel: 973.674.1700     Toll Free: 1.800.526.1389      Fax: 973.674.3803     Email: sales@unicorpinc.com