Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

• the most efficient way to navigate the Engineering ToolBox!

Inches vs. mm - Conversion Chart

Convert fractional and/or decimal inches to metric mm - and vice versa.

How many millimeters in an inch?

• 1 inch (in) = 25.4 millimeter (mm)
• 1 millimeter (mm) = 0.0393700787 inch (in)

mm

in

Fractional Inches to Decimal Inches and Metric Millimeters

The table below can be used to convert between fractional and/or decimal inches and metric millimeters.

 Inches Metric Fractional Decimal mm . 0.0039 0.1000 . 0.0079 0.2000 . 0.0118 0.3000 1/64 0.0156 0.3969 . 0.0157 0.4000 . 0.0197 0.5000 . 0.0236 0.6000 . 0.0276 0.7000 1/32 0.0313 0.7938 . 0.0315 0.8000 . 0.0354 0.9000 . 0.0394 1.0000 . 0.0433 1.1000 3/64 0.0469 1.1906 . 0.0472 1.2000 . 0.0512 1.3000 . 0.0551 1.4000 . 0.0591 1.5000 1/16 0.0625 1.5875 . 0.0630 1.6000 . 0.0669 1.7000 . 0.0709 1.8000 . 0.0748 1.9000 5/64 0.0781 1.9844 . 0.0787 2.0000 . 0.0827 2.1000 . 0.0866 2.2000 . 0.0906 2.3000 3/32 0.0938 2.3813 . 0.0945 2.4000 . 0.0984 2.5000 7/64 0.1094 2.7781 . 0.1181 3.0000 1/8 0.1250 3.1750 . 0.1378 3.5000 9/64 0.1406 3.5719 5/32 0.1563 3.9688 . 0.1575 4.0000 11/64 0.1719 4.3656 . 0.1772 4.5000 3/16 0.1875 4.7625 . 0.1969 5.0000 13/64 0.2031 5.1594 . 0.2165 5.5000 7/32 0.2188 5.5563 15/64 0.2344 5.9531 . 0.2362 6.0000 1/4 0.2500 6.3500 . 0.2559 6.5000 17/64 0.2656 6.7469 . 0.2756 7.0000 9/32 0.2813 7.1438 . 0.2953 7.5000 19/64 0.2969 7.5406 5/16 0.3125 7.9375 . 0.3150 8.0000 21/64 0.3281 8.3344 . 0.3346 8.5000 11/32 0.3438 8.7313 . 0.3543 9.0000 23/64 0.3594 9.1281 . 0.3740 9.5000 3/8 0.3750 9.5250 25/64 0.3906 9.9219 . 0.3937 10.0000 13/32 0.4063 10.3188 . 0.4134 10.5000 27/64 0.4219 10.7156 . 0.4331 11.0000 7/16 0.4375 11.1125 . 0.4528 11.5000 29/64 0.4531 11.5094 15/32 0.4688 11.9063 . 0.4724 12.0000 31/64 0.4844 12.3031 . 0.4921 12.5000 1/2 0.5000 12.7000 . 0.5118 13.0000 33/64 0.5156 13.0969 17/32 0.5313 13.4938 . 0.5315 13.5000 35/64 0.5469 13.8906 . 0.5512 14.0000 9/16 0.5625 14.2875 . 0.5709 14.5000 37/64 0.5781 14.6844 . 0.5906 15.0000 19/32 0.5938 15.0813 39/64 0.6094 15.4781 . 0.6102 15.5000 5/8 0.6250 15.8750 . 0.6299 16.0000 41/64 0.6406 16.2719 . 0.6496 16.5000 21/32 0.6563 16.6688 . 0.6693 17.0000 43/64 0.6719 17.0656 11/16 0.6875 17.4625 . 0.6890 17.5000 45/64 0.7031 17.8594 . 0.7087 18.0000 23/32 0.7188 18.2563 . 0.7283 18.5000 47/64 0.7344 18.6531 . 0.7480 19.0000 3/4 0.7500 19.0500 49/64 0.7656 19.4469 . 0.7677 19.5000 25/32 0.7813 19.8438 . 0.7874 20.0000 51/64 0.7969 20.2406 . 0.8071 20.5000 13/16 0.8125 20.6375 . 0.8268 21.0000 53/64 0.8281 21.0344 27/32 0.8438 21.4313 . 0.8465 21.5000 55/64 0.8594 21.8281 . 0.8661 22.0000 7/8 0.8750 22.2250 . 0.8858 22.5000 57/64 0.89063 22.6219 . 0.9055 23.0000 29/32 0.90625 23.0188 59/64 0.92188 23.4156 . 0.9252 23.5000 15/16 0.93750 23.8125 . 0.9449 24.0000 61/64 0.95313 24.2094 . 0.9646 24.5000 31/32 0.96875 24.6063 . 0.9843 25.0000 63/64 0.98438 25.0031 1 1.000 25.40 . 1.0039 25.5000 . 1.0236 26.0000 . 1.0433 26.5000 . 1.0630 27.0000 . 1.0827 27.5000 . 1.1024 28.0000 . 1.1220 28.5000 . 1.1417 29.0000 . 1.1614 29.5000 . 1.1811 30.0000 . 1.2205 31.0000 1 1/4 1.2500 31.7500 . 1.2598 32.0000 . 1.2992 33.0000 . 1.3386 34.0000 . 1.3780 35.0000 . 1.4173 36.0000 . 1.4567 37.0000 . 1.4961 38.0000 1 1/2 1.5000 38.1000 . 1.5354 39.0000 . 1.5748 40.0000 . 1.6142 41.0000 . 1.6535 42.0000 . 1.6929 43.0000 . 1.7323 44.0000 1 3/4 1.7500 44.4500 . 1.7717 45.0000 . 1.8110 46.0000 . 1.8504 47.0000 . 1.8898 48.0000 . 1.9291 49.0000 . 1.9685 50.0000 2 2.0000 50.8000 . 2.0079 51.0000 . 2.0472 52.0000 . 2.0866 53.0000 . 2.1260 54.0000 . 2.1654 55.0000 . 2.2047 56.0000 . 2.2441 57.0000 2 1/4 2.2500 57.1500 . 2.2835 58.0000 . 2.3228 59.0000 . 2.3622 60.0000 . 2.4016 61.0000 . 2.4409 62.0000 . 2.4803 63.0000 2 1/2 2.5000 63.5000 . 2.5197 64.0000 . 2.5591 65.0000 . 2.5984 66.0000 . 2.6378 67.0000 . 2.6772 68.0000 . 2.7165 69.0000 2 3/4 2.7500 69.8500 . 2.7559 70.0000 . 2.7953 71.0000 . 2.8346 72.0000 . 2.8740 73.0000 . 2.9134 74.0000 . 2.9528 75.0000 . 2.9921 76.0000 3 3.0000 76.2000 . 3.0315 77.0000 . 3.0709 78.0000 . 3.1102 79.0000 . 3.1496 80.0000 . 3.1890 81.0000 . 3.2283 82.0000 . 3.2677 83.0000 . 3.3071 84.0000 . 3.3465 85.0000 . 3.3858 86.0000 . 3.4252 87.0000 . 3.4646 88.0000 3 1/2 3.5000 88.9000 . 3.5039 89.0000 . 3.5433 90.0000 . 3.5827 91.0000 . 3.6220 92.0000 . 3.6614 93.0000 . 3.7008 94.0000 . 3.7402 95.0000 . 3.7795 96.0000 . 3.8189 97.0000 . 3.8583 98.0000 . 3.8976 99.0000 . 3.9370 100.0000 4 4.0000 101.6000 . 4.3307 110.0000 4 1/2 4.5000 114.3000 . 4.7244 120.0000 5 5.0000 127.0000 . 5.1181 130.0000 . 5.5118 140.0000 . 5.9055 150.0000 6 6.0000 152.4000 . 6.2992 160.0000 . 6.6929 170.0000 . 7.0866 180.0000 . 7.4803 190.0000 . 7.8740 200.0000 8 8.0000 203.2000 . 9.8425 250.0000 10 10.0000 254.0000 20 20.0000 508.0000 30 30.0000 762.0000 40 40.0000 1016.000 60 60.0000 1524.000 80 80.0000 2032.000 100 100.0000 2540.000

Decimal Inches to mm

Convert from decimal inches to mm:

 mm inches 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.00 0.00 0.25 0.51 0.76 1.02 1.27 1.52 1.78 2.03 2.29 0.10 2.54 2.79 3.05 3.30 3.56 3.81 4.06 4.32 4.57 4.83 0.20 5.08 5.33 5.59 5.84 6.10 6.35 6.60 6.86 7.11 7.37 0.30 7.62 7.87 8.13 8.38 8.64 8.89 9.14 9.40 9.65 9.91 0.40 10.16 10.41 10.67 10.92 11.18 11.43 11.68 11.94 12.19 12.45 0.50 12.70 12.95 13.21 13.46 13.72 13.97 14.22 14.48 14.73 14.99 0.60 15.24 15.49 15.75 16.00 16.26 16.51 16.76 17.02 17.27 17.53 0.70 17.78 18.03 18.29 18.54 18.80 19.05 19.30 19.56 19.81 20.07 0.80 20.32 20.57 20.83 21.08 21.34 21.59 21.84 22.10 22.35 22.61 0.90

mm to Decimal Inches

Convert from mm to decimal inches:

 inches mm 0 1 2 3 4 5 6 7 8 9 0 0.0000 0.0394 0.0787 0.118 0.157 0.197 0.236 0.276 0.315 0.354 10 0.394 0.433 0.472 0.512 0.551 0.591 0.630 0.669 0.709 0.748 20 0.787 0.827 0.866 0.906 0.945 0.984 1.02 1.06 1.10 1.14 30 1.18 1.22 1.26 1.30 1.34 1.38 1.42 1.46 1.50 1.54 40 1.57 1.61 1.65 1.69 1.73 1.77 1.81 1.85 1.89 1.93 50 1.97 2.01 2.05 2.09 2.13 2.17 2.20 2.24 2.28 2.32 60 2.36 2.40 2.44 2.48 2.52 2.56 2.60 2.64 2.68 2.72 70 2.76 2.80 2.83 2.87 2.91 2.95 2.99 3.03 3.07 3.11 80 3.15 3.19 3.23 3.27 3.31 3.35 3.39 3.43 3.46 3.50 90 3.54 3.58 3.62 3.66 3.70 3.74 3.78 3.82 3.86 3.90 100 3.94 3.98 4.02 4.06 4.09 4.13 4.17 4.21 4.25 4.29 110 4.33 4.37 4.41 4.45 4.49 4.53 4.57 4.61 4.65 4.69 120 4.72 4.76 4.80 4.84 4.88 4.92 4.96 5.00 5.04 5.08 130 5.12 5.16 5.20 5.24 5.28 5.31 5.35 5.39 5.43 5.47 140 5.51 5.55 5.59 5.63 5.67 5.71 5.75 5.79 5.83 5.87 150 5.91 5.94 5.98 6.02 6.06 6.10 6.14 6.18 6.22 6.26 160 6.30 6.34 6.38 6.42 6.46 6.50 6.54 6.57 6.61 6.65 170 6.69 6.73 6.77 6.81 6.85 6.89 6.93 6.97 7.01 7.05 180 7.09 7.13 7.17 7.20 7.24 7.28 7.32 7.36 7.40 7.44 190 7.48 7.52 7.56 7.60 7.64 7.68 7.72 7.76 7.80 7.83 200 7.87 7.91 7.95 7.99 8.03 8.07 8.11 8.15 8.19 8.23 210 8.27 8.31 8.35 8.39 8.43 8.46 8.50 8.54 8.58 8.62 220 8.66 8.70 8.74 8.78 8.82 8.86 8.90 8.94 8.98 9.02 230 9.06 9.09 9.13 9.17 9.21 9.25 9.29 9.33 9.37 9.41 240 9.45 9.49 9.53 9.57 9.61 9.65 9.69 9.72 9.76 9.80 250 9.84 9.88 9.92 9.96 10.0 10.0 10.1 10.1 10.2 10.2 260 10.2 10.3 10.3 10.4 10.4 10.4 10.5 10.5 10.6 10.6 270 10.6 10.7 10.7 10.7 10.8 10.8 10.9 10.9 10.9 11.0 280 11.0 11.1 11.1 11.1 11.2 11.2 11.3 11.3 11.3 11.4 290 11.4 11.5 11.5 11.5 11.6 11.6 11.7 11.7 11.7 11.8 300 11.8 11.9 11.9 11.9 12.0 12.0 12.0 12.1 12.1 12.2 310 12.2 12.2 12.3 12.3 12.4 12.4 12.4 12.5 12.5 12.6 320 12.6 12.6 12.7 12.7 12.8 12.8 12.8 12.9 12.9 13.0 330 13.0 13.0 13.1 13.1 13.1 13.2 13.2 13.3 13.3 13.3 340 13.4 13.4 13.5 13.5 13.5 13.6 13.6 13.7 13.7 13.7 350 13.8 13.8 13.9 13.9 13.9 14.0 14.0 14.1 14.1 14.1 360 14.2 14.2 14.3 14.3 14.3 14.4 14.4 14.4 14.5 14.5 370 14.6 14.6 14.6 14.7 14.7 14.8 14.8 14.8 14.9 14.9 380 15.0 15.0 15.0 15.1 15.1 15.2 15.2 15.2 15.3 15.3 390 15.4 15.4 15.4 15.5 15.5 15.6 15.6 15.6 15.7 15.7 400 15.7 15.8 15.8 15.9 15.9 15.9 16.0 16.0 16.1 16.1 410 16.1 16.2 16.2 16.3 16.3 16.3 16.4 16.4 16.5 16.5 420 16.5 16.6 16.6 16.7 16.7 16.7 16.8 16.8 16.9 16.9 430 16.9 17.0 17.0 17.0 17.1 17.1 17.2 17.2 17.2 17.3 440 17.3 17.4 17.4 17.4 17.5 17.5 17.6 17.6 17.6 17.7 450 17.7 17.8 17.8 17.8 17.9 17.9 18.0 18.0 18.0 18.1 460 18.1 18.1 18.2 18.2 18.3 18.3 18.3 18.4 18.4 18.5 470 18.5 18.5 18.6 18.6 18.7 18.7 18.7 18.8 18.8 18.9 480 18.9 18.9 19.0 19.0 19.1 19.1 19.1 19.2 19.2 19.3 490 19.3 19.3 19.4 19.4 19.4 19.5 19.5 19.6 19.6 19.6 500 19.7 19.7 19.8 19.8 19.8 19.9 19.9 20.0 20.0 20.0 510 20.1 20.1 20.2 20.2 20.2 20.3 20.3 20.4 20.4 20.4 520 20.5 20.5 20.6 20.6 20.6 20.7 20.7 20.7 20.8 20.8 530 20.9 20.9 20.9 21.0 21.0 21.1 21.1 21.1 21.2 21.2 540 21.3 21.3 21.3 21.4 21.4 21.5 21.5 21.5 21.6 21.6 550 21.7 21.7 21.7 21.8 21.8 21.9 21.9 21.9 22.0 22.0 560 22.0 22.1 22.1 22.2 22.2 22.2 22.3 22.3 22.4 22.4 570 22.4 22.5 22.5 22.6 22.6 22.6 22.7 22.7 22.8 22.8 580 22.8 22.9 22.9 23.0 23.0 23.0 23.1 23.1 23.1 23.2 590 23.2 23.3 23.3 23.3 23.4 23.4 23.5 23.5 23.5 23.6 600 23.6 23.7 23.7 23.7 23.8 23.8 23.9 23.9 23.9 24.0 610 24.0 24.1 24.1 24.1 24.2 24.2 24.3 24.3 24.3 24.4 620 24.4 24.4 24.5 24.5 24.6 24.6 24.6 24.7 24.7 24.8 630 24.8 24.8 24.9 24.9 25.0 25.0 25.0 25.1 25.1 25.2 640 25.2 25.2 25.3 25.3 25.4 25.4 25.4 25.5 25.5 25.6 650 25.6 25.6 25.7 25.7 25.7 25.8 25.8 25.9 25.9 25.9 660 26.0 26.0 26.1 26.1 26.1 26.2 26.2 26.3 26.3 26.3 670 26.4 26.4 26.5 26.5 26.5 26.6 26.6 26.7 26.7 26.7 680 26.8 26.8 26.9 26.9 26.9 27.0 27.0 27.0 27.1 27.1 690 27.2 27.2 27.2 27.3 27.3 27.4 27.4 27.4 27.5 27.5 700 27.6 27.6 27.6 27.7 27.7 27.8 27.8 27.8 27.9 27.9 710 28.0 28.0 28.0 28.1 28.1 28.1 28.2 28.2 28.3 28.3 720 28.3 28.4 28.4 28.5 28.5 28.5 28.6 28.6 28.7 28.7 730 28.7 28.8 28.8 28.9 28.9 28.9 29.0 29.0 29.1 29.1 740 29.1 29.2 29.2 29.3 29.3 29.3 29.4 29.4 29.4 29.5 750 29.5 29.6 29.6 29.6 29.7 29.7 29.8 29.8 29.8 29.9 760 29.9 30.0 30.0 30.0 30.1 30.1 30.2 30.2 30.2 30.3 770 30.3 30.4 30.4 30.4 30.5 30.5 30.6 30.6 30.6 30.7 780 30.7 30.7 30.8 30.8 30.9 30.9 30.9 31.0 31.0 31.1 790 31.1 31.1 31.2 31.2 31.3 31.3 31.3 31.4 31.4 31.5 800 31.5 31.5 31.6 31.6 31.7 31.7 31.7 31.8 31.8 31.9 810 31.9 31.9 32.0 32.0 32.0 32.1 32.1 32.2 32.2 32.2 820 32.3 32.3 32.4 32.4 32.4 32.5 32.5 32.6 32.6 32.6 830 32.7 32.7 32.8 32.8 32.8 32.9 32.9 33.0 33.0 33.0 840 33.1 33.1 33.1 33.2 33.2 33.3 33.3 33.3 33.4 33.4 850 33.5 33.5 33.5 33.6 33.6 33.7 33.7 33.7 33.8 33.8 860 33.9 33.9 33.9 34.0 34.0 34.1 34.1 34.1 34.2 34.2 870 34.3 34.3 34.3 34.4 34.4 34.4 34.5 34.5 34.6 34.6 880 34.6 34.7 34.7 34.8 34.8 34.8 34.9 34.9 35.0 35.0 890 35.0 35.1 35.1 35.2 35.2 35.2 35.3 35.3 35.4 35.4 900 35.4 35.5 35.5 35.6 35.6 35.6 35.7 35.7 35.7 35.8 910 35.8 35.9 35.9 35.9 36.0 36.0 36.1 36.1 36.1 36.2 920 36.2 36.3 36.3 36.3 36.4 36.4 36.5 36.5 36.5 36.6 930 36.6 36.7 36.7 36.7 36.8 36.8 36.9 36.9 36.9 37.0 940 37.0 37.0 37.1 37.1 37.2 37.2 37.2 37.3 37.3 37.4 950 37.4 37.4 37.5 37.5 37.6 37.6 37.6 37.7 37.7 37.8 960 37.8 37.8 37.9 37.9 38.0 38.0 38.0 38.1 38.1 38.1 970 38.2 38.2 38.3 38.3 38.3 38.4 38.4 38.5 38.5 38.5 980 38.6 38.6 38.7 38.7 38.7 38.8 38.8 38.9 38.9 38.9 990 39.0 39.0 39.1 39.1 39.1 39.2 39.2 39.3 39.3 39.3 1000 39.4 39.4 39.4 39.5 39.5 39.6 39.6 39.6 39.7 39.7

Related Topics

• Basics - The SI-system, unit converters, physical constants, drawing scales and more.

Search Engineering ToolBox

• the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 10