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Fraction Conversion Chart - Fractional Inches to Decimal Equivalents.         

 

What is the formula used to convert fractional inches to decimal?

Take the first number and divide it by the second number. For example (1/64) 1 divided by 64 equals .015625  

 

      Convert fractions to decimals and millimeters and reverse.
(1 INCH = 25.4 MM EXACTLY)



fractiondecimalmmfractiondecimalmmfractiondecimalmm
1/640.01560.39691 1/641.015625.79692 1/642.015651.1969
1/320.03130.79381 1/321.031326.19382 1/322.031351.5938
3/640.04691.19061 3/641.046926.59062 3/642.046951.9906
1/160.06251.58751 1/161.062526.98752 1/162.062552.3875
5/640.07811.98441 5/641.078127.38442 5/642.078152.7844
3/320.09382.38131 3/321.093827.78132 3/322.093853.1813
7/640.10942.77811 7/641.109428.17812 7/642.109453.5781
1/8 0.12503.17501 1/8 1.125028.57502 1/8 2.125053.9750
9/640.14063.57191 9/641.140628.97192 9/642.140654.3719
5/320.15633.96881 5/321.156329.36882 5/322.156354.7688
11/640.17194.36561 11/641.171929.76562 11/642.171955.1656
3/160.18754.76251 3/161.187530.16252 3/162.187555.5625
13/640.20315.15941 13/641.203130.55942 13/642.203155.9594
7/320.21885.55631 7/321.218830.95632 7/322.218856.3563
15/640.23445.95311 15/641.234431.35312 15/642.234456.7531
1/4 0.25006.35001 1/4 1.250031.75002 1/4 2.250057.1500
17/640.26566.74691 17/641.265632.14692 17/642.265657.5469
9/320.28137.14381 9/321.281332.54382 9/322.281357.9438
19/640.29697.54061 19/641.296932.94062 19/642.296958.3406
5/160.31257.93751 5/161.312533.33752 5/162.312558.7375
21/640.32818.33441 21/641.328133.73442 21/642.328159.1344
11/320.34388.73131 11/321.343834.13132 11/322.343859.5313
23/640.35949.12811 23/641.359434.52812 23/642.359459.9281
3/8 0.37509.52501 3/8 1.375034.92502 3/8 2.375060.3250
25/640.39069.92191 25/641.390635.32192 25/642.390660.7219
13/320.406310.31881 13/321.406335.71882 13/322.406361.1188
27/640.421910.71561 27/641.421936.11562 27/642.421961.5156
7/160.437511.11251 7/161.437536.51252 7/162.437561.9125
29/640.453111.50941 29/641.453136.90942 29/642.453162.3094
15/320.468811.90631 15/321.468837.30632 15/322.468862.7063
31/640.484412.30311 31/641.484437.70312 31/642.484463.1031
1/2 0.500012.70001 1/2 1.500038.10002 1/2 2.500063.5000
33/640.515613.09691 33/641.515638.49692 33/642.515663.8969
17/320.531313.49381 17/321.531338.89382 17/322.531364.2938
35/640.546913.89061 35/641.546939.29062 35/642.546964.6906
9/160.562514.28751 9/161.562539.68752 9/162.562565.0875
37/640.578114.68441 37/641.578140.08442 37/642.578165.4844
19/320.593815.08131 19/321.593840.48132 19/322.593865.8813
39/640.609415.47811 39/641.609440.87812 39/642.609466.2781
5/8 0.625015.87501 5/8 1.625041.27502 5/8 2.625066.6750
41/640.640616.27191 41/641.640641.67192 41/642.640667.0719
21/320.656316.66881 21/321.656342.06882 21/322.656367.4688
43/640.671917.06561 43/641.671942.46562 43/642.671967.8656
11/160.687517.46251 11/161.687542.86252 11/162.687568.2625
45/640.703117.85941 45/641.703143.25942 45/642.703168.6594
23/320.718818.25631 23/321.718843.65632 23/322.718869.0563
47/640.734418.65311 47/641.734444.05312 47/642.734469.4531
3/4 0.750019.05001 3/4 1.750044.45002 3/4 2.750069.8500
49/640.765619.44691 49/641.765644.84692 49/642.765670.2469
25/320.781319.84381 25/321.781345.24382 25/322.781370.6438
51/640.796920.24061 51/641.796945.64062 51/642.796971.0406
13/160.812520.63751 13/161.812546.03752 13/162.812571.4375
53/640.828121.03441 53/641.828146.43442 53/642.828171.8344
27/320.843821.43131 27/321.843846.83132 27/322.843872.2313
55/640.859421.82811 55/641.859447.22812 55/642.859472.6281
7/8 0.875022.22501 7/8 1.875047.62502 7/8 2.875073.0250
57/640.890622.62191 57/641.890648.02192 57/642.890673.4219
29/320.906323.01881 29/321.906348.41882 29/322.906373.8188
59/640.921923.41561 59/641.921948.81562 59/642.921974.2156
15/160.937523.81251 15/161.937549.21252 15/162.937574.6125
61/640.953124.20941 61/641.953149.60942 61/642.953175.0094
31/320.968824.60631 31/321.968850.00632 31/322.968875.4063
63/640.984425.00311 63/641.984450.40312 63/642.984475.8031
1 1.000025.40002 2.000050.80003 3.000076.2000