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Inches to Centimeters
1 Inch = 2.54 cm
Multiply number of inches by 2.54 to get length in centimeters.
2.54 x inches = cm
example

2.54 x 10 inches = 25.4 cm

face=”Arial,Helvetica,Geneva,Swiss,SunSans-Regular” size=”2″>Centimeters to Inches
1 cm = 0.3937 inch
Multiply the number of cm by 0.3937 to get length in inches.
0.3937 x cm = inches
example

0.3937 inches x 6 cm = 2.362 inches

Inches to Millimeters
Multiply number of inches by 25.4 to get length in millimeters.
25.4 x in = mm
example
25.4 x 0.25 inch = 6.35 mm

Millimeters to Inches
Multiply number of millimeters by .03937 to get length in inches.
0.03937 x mm = inches
example

0.03937 x 10 mm = .3937 inches


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Fractions to Decimal and Millimeter

 fractiondecimalmm fractiondecimalmm fractiondecimalmm 
 1/640.01560.3969 1 1/641.015625.7969 2 1/642.015651.1969 
 1/320.03130.7938 1 1/321.031326.1938 2 1/322.031351.5938 
 3/640.04691.1906 1 3/641.046926.5906 2 3/642.046951.9906 
 1/160.06251.5875 1 1/161.062526.9875 2 1/162.062552.3875 
 5/640.07811.9844 1 5/641.078127.3844 2 5/642.078152.7844 
 3/320.09382.3813 1 3/321.093827.7813 2 3/322.093853.1813 
 7/640.10942.7781 1 7/641.109428.1781 2 7/642.109453.5781 
 1/8 0.12503.1750 1 1/8 1.125028.5750 2 1/8 2.125053.9750 
 9/640.14063.5719 1 9/641.140628.9719 2 9/642.140654.3719 
 5/320.15633.9688 1 5/321.156329.3688 2 5/322.156354.7688 
 11/640.17194.3656 1 11/641.171929.7656 2 11/642.171955.1656 
 3/160.18754.7625 1 3/161.187530.1625 2 3/162.187555.5625 
 13/640.20315.1594 1 13/641.203130.5594 2 13/642.203155.9594 
 7/320.21885.5563 1 7/321.218830.9563 2 7/322.218856.3563 
 15/640.23445.9531 1 15/641.234431.3531 2 15/642.234456.7531 
 1/4 0.25006.3500 1 1/4 1.250031.7500 2 1/4 2.250057.1500 
 17/640.26566.7469 1 17/641.265632.1469 2 17/642.265657.5469 
 9/320.28137.1438 1 9/321.281332.5438 2 9/322.281357.9438 
 19/640.29697.5406 1 19/641.296932.9406 2 19/642.296958.3406 
 5/160.31257.9375 1 5/161.312533.3375 2 5/162.312558.7375 
 21/640.32818.3344 1 21/641.328133.7344 2 21/642.328159.1344 
 11/320.34388.7313 1 11/321.343834.1313 2 11/322.343859.5313 
 23/640.35949.1281 1 23/641.359434.5281 2 23/642.359459.9281 
 3/8 0.37509.5250 1 3/8 1.375034.9250 2 3/8 2.375060.3250 
 25/640.39069.9219 1 25/641.390635.3219 2 25/642.390660.7219 
 13/320.406310.3188 1 13/321.406335.7188 2 13/322.406361.1188 
 27/640.421910.7156 1 27/641.421936.1156 2 27/642.421961.5156 
 7/160.437511.1125 1 7/161.437536.5125 2 7/162.437561.9125 
 29/640.453111.5094 1 29/641.453136.9094 2 29/642.453162.3094 
 15/320.468811.9063 1 15/321.468837.3063 2 15/322.468862.7063 
 31/640.484412.3031 1 31/641.484437.7031 2 31/642.484463.1031 
 1/2 0.500012.7000 1 1/2 1.500038.1000 2 1/2 2.500063.5000 
 33/640.515613.0969 1 33/641.515638.4969 2 33/642.515663.8969 
 17/320.531313.4938 1 17/321.531338.8938 2 17/322.531364.2938 
 35/640.546913.8906 1 35/641.546939.2906 2 35/642.546964.6906 
 9/160.562514.2875 1 9/161.562539.6875 2 9/162.562565.0875 
 37/640.578114.6844 1 37/641.578140.0844 2 37/642.578165.4844 
 19/320.593815.0813 1 19/321.593840.4813 2 19/322.593865.8813 
 39/640.609415.4781 1 39/641.609440.8781 2 39/642.609466.2781 
 5/8 0.625015.8750 1 5/8 1.625041.2750 2 5/8 2.625066.6750 
 41/640.640616.2719 1 41/641.640641.6719 2 41/642.640667.0719 
 21/320.656316.6688 1 21/321.656342.0688 2 21/322.656367.4688 
 43/640.671917.0656 1 43/641.671942.4656 2 43/642.671967.8656 
 11/160.687517.4625 1 11/161.687542.8625 2 11/162.687568.2625 
 45/640.703117.8594 1 45/641.703143.2594 2 45/642.703168.6594 
 23/320.718818.2563 1 23/321.718843.6563 2 23/322.718869.0563 
 47/640.734418.6531 1 47/641.734444.0531 2 47/642.734469.4531 
 3/4 0.750019.0500 1 3/4 1.750044.4500 2 3/4 2.750069.8500 
 49/640.765619.4469 1 49/641.765644.8469 2 49/642.765670.2469 
 25/320.781319.8438 1 25/321.781345.2438 2 25/322.781370.6438 
 51/640.796920.2406 1 51/641.796945.6406 2 51/642.796971.0406 
 13/160.812520.6375 1 13/161.812546.0375 2 13/162.812571.4375 
 53/640.828121.0344 1 53/641.828146.4344 2 53/642.828171.8344 
 27/320.843821.4313 1 27/321.843846.8313 2 27/322.843872.2313 
 55/640.859421.8281 1 55/641.859447.2281 2 55/642.859472.6281 
 7/8 0.875022.2250 1 7/8 1.875047.6250 2 7/8 2.875073.0250 
 57/640.890622.6219 1 57/641.890648.0219 2 57/642.890673.4219 
 29/320.906323.0188 1 29/321.906348.4188 2 29/322.906373.8188 
 59/640.921923.4156 1 59/641.921948.8156 2 59/642.921974.2156 
 15/160.937523.8125 1 15/161.937549.2125 2 15/162.937574.6125 
 61/640.953124.2094 1 61/641.953149.6094 2 61/642.953175.0094 
 31/320.968824.6063 1 31/321.968850.0063 2 31/322.968875.4063 
 63/640.984425.0031 1 63/641.984450.4031 2 63/642.984475.8031 
 1 1.000025.4000 2 2.000050.8000 3 3.000076.2000 

Wire Gauge Reference: (American Wire Standard)

millimeter decimalclosest fractional inch
5mm0.20"1/5"
6mm0.24" 1/4"
8mm 0.31" 5/16"
10mm 0.39between 3/8 & 7/16"
12mm0.47" between 7/16 & 1/2"
14mm 0.55" between 1/2 & 9/16"
16mm0.63"5/8"
18mm0.71"between 5/8 & 3/4"
20mm 0.79" between 3/4 & 13/16"
22mm0.87"7/8"
24mm0.95"between 15/16 & 1"
25mm 0.98"hair under 1"
26mm1.02"hair over 1"
28mm1.10"1-1/8"
30mm 1.18"1-3/16"
32mm1.26"1-1/4"
34mm1.34"1-1/3"
35mm1.38"1-3/8"
36mm1.42"1-7/16"
38mm 1.50"1-1/2"
40mm 1.57"1-9/16"
45mm1.77"1-3/4"
49mm1.93"1-15/16"
50mm 1.97" 2"