Inch to Millimeter Conversions Decimal mm 0.001 0.0254 0.002 0.0508 0.003 0.0762 0.004 0.1016 0.005 0.1270 0.006 0.1524 0.007 0.1778 0.008 0.2032 0.009 0.2286 0.010 0.2540 0.020 0.5080 0.030 0.7620 0.040 1.0160 0.050 1.2700 0.060 1.5240 0.070 1.7780 0.080 2.0320 0.090 2.2860 0.100 2.5400 0.110 2.7940 0.120 3.0480 0.130 3.3020 0.140 3.5560 0.150 3.8100 0.160 4.0640 0.170 4.3180 0.180 4.5720 0.190 4.8260 0.200 5.0800 0.210 5.3340 0.220 5.5880 0.230 5.8420 0.240 6.0690 0.250 6.3500 0.260 6.6040 0.270 6.8580 0.280 7.1120 0.290 7.3660 0.300 7.6200 0.310 7.8740 0.320 8.1280 0.330 8.3820 0.340 8.6360 0.350 8.8900 0.360 9.1440 0.370 9.3980 0.380 9.6520 0.390 9.9060 0.400 10.1600 0.410 10.4140 0.420 10.6680 0.430 10.9220 0.440 11.1760 0.450 11.4300 0.460 11.6840 0.470 11.9380 0.480 12.1920 0.490 12.4460 Fraction Decimal mm 1/64 0.0156 0.3969 1/32 0.0313 0.7938 3/64 0.0469 1.1906 1/16 0.0625 1.5875 5/64 0.0781 1.9844 3/32 0.0938 2.3812 7/64 0.1094 2.7781 1/8 0.1250 3.1750 9/64 0.1406 3.5719 5/32 0.1563 3.9688 11/64 0.1719 4.3656 3/16 0.1875 4.7625 13/64 0.2031 5.1594 7/32 0.2188 5.5562 15/64 0.2344 5.9531 1/4 0.2500 6.3500 17/64 0.2656 6.7469 9/32 0.2813 7.1438 19/64 0.2969 7.5406 5/16 0.3125 7.9375 21/64 0.3281 8.3344 11/32 0.3438 8.7312 23/64 0.3594 9.1281 3/8 0.3750 9.5250 25/64 0.3906 9.9219 13/32 0.4063 10.3188 27/64 0.4219 10.7156 7/16 0.4375 11.1125 29/64 0.4531 11.5094 15/32 0.4688 11.9062 31/64 0.4844 12.3031 1/2 0.5000 12.700 33/64 0.5156 13.0969 17/32 0.5313 13.4938 35/64 0.5469 13.8906 9/16 0.5625 14.2875 37/64 0.5781 14.6844 19/32 0.5938 15.0812 39/64 0.6094 15.4781 5/8 0.6250 15.8750 41/64 0.6406 16.2719 21/32 0.6563 16.6688 43/64 0.6719 17.0656 11/16 0.6875 17.4625 45/64 0.7031 17.8594 23/32 0.7188 18.2562 47/64 0.7344 18.6531 3/4 0.7500 19.0500 49/64 0.7656 19.4469 25/32 0.7813 19.8438 51/64 0.7969 20.2406 13/16 0.8125 20.6375 53/64 0.8281 21.0344 27/32 0.8438 21.4312 55/64 0.8594 21.8281 7/8 0.8750 22.2250 57/64 0.8906 22.6219 29/32 0.9063 23.0188 59/64 0.9219 23.4156 15/16 0.9375 23.8125 61/64 0.9531 24.2094 31/32 0.9688 24.6062 63/64 0.9844 25.0031 1 1.0000 25.4000 Decimal mm 0.500 12.7000 0.510 12.9540 0.520 13.2080 0.530 13.4620 0.540 13.7160 0.550 13.9700 0.560 14.2240 0.570 14.4780 0.580 14.7320 0.590 14.9860 0.600 15.2400 0.610 15.4940 0.620 15.7480 0.630 16.0020 0.640 16.2560 0.650 16.5100 0.660 16.7640 0.670 17.0180 0.680 17.2720 0.690 17.5260 0.700 17.7800 0.710 18.0340 0.720 18.2880 0.730 18.5420 0.740 18.7960 0.750 19.0500 0.760 19.3040 0.770 19.5580 0.780 19.8120 0.790 20.0660 0.800 20.3200 0.810 20.5740 0.820 20.8280 0.830 21.0820 0.840 21.3360 0.850 21.5900 0.860 21.8440 0.870 22.0980 0.880 22.3520 0.890 22.6060 0.900 22.8600 0.910 23.1140 0.920 23.3680 0.930 23.6220 0.940 23.8760 0.950 24.1300 0.960 24.3840 0.970 24.6380 0.980 24.8920 0.990 25.1460 1.000 25.4000 579 starrett.com R eference T ables