To convert millimetres to inches, divide the. To convert inches to millimetres, multiply the inches by 25.4. Close enough.Īs Ian mentions, this is all you need for drilling-type work. decimal inches fractional decimal mm inches. Correct down by 1.6% for more precision I use 1.5% because it's easier: the 1% gives 0.0076 and the 0.5% is half of that, so we subtract 0.0076 + 0.0038 = 0.0114 to get 0.749. Double 19 twice to get 76 and divide by 100 to get 0.76. Of course, these rules are for when all you have is a pencil and piece of paper, as the easiest thing to do is to multiply or divide by 25.4 if you have a calculator - and it's exact.Įxample: 19 mm is nearly identical to 3/4" (which I discovered long ago when I didn't have a metric wrench handy). The error is 1.6% if you want to make corrections. To convert approximately back and forth between mm and inches, I divide or multiply by 2 twice and shift the decimal point (from 1 mm being 0.03937 inches). I love the idea, as the 256 part had never occurred to me before, but it's obvious after you mention it. Hi, Ian: just to make things clear, you're talking about converting fractional inches to mm the method I gave was just to convert a fractional inch to a decimal inch. Or print out scale.pdf from **broken link removed** (has other useful stuff on it too). Or, find one of the old Gilson circular slide rules, as they had nice fraction to decimal conversions on them. Postscript, such things are not hard to make. This method will usually get you within a thousandth or so of the true value.īusinesses like Cleveland Twist Drill used to sell handy little circular "slide rules" that would do fraction and number drill conversions along with cutting speed calculations (see attached photo) - see if anything similar is sold at a local industrial supplier (I've had mine since the 60's). Thus, you get 0.422".Īfter a while you come to know the 16ths too thus, since this is 1/64th below 7/16, you just say "438", "428", "422" in your head. Then start from a number you know and make corrections.Įxample: you want the decimal equivalent of 27/64". Memorize the decimal equivalents of all the eighths. You might also be interested in our fraction and percent equivalents table for the percentage equivalents for common fractions.Click to expand.Memorize that 1/16" = 0.062, 1/32" = 0.031, 1/64" = 0.016. Not seeing your fraction It’s possible that it’s not fully reduced, try simplifying the fraction first, or just use our calculator to convert a fraction to a decimal. Farwest makes it easy to convert inches to decimals using this convienent inches conversion chart. The number you enter can also have decimal places as in 3.5 or 0.625. Enter percents to convert them into fractions. If the percent value is greater than 100 it is converted into a mixed number fraction. The information presented here is intended for quick reference only. This online calculator converts a percent to a fraction. FractionĪre you trying to convert a decimal to fraction? Try our decimal to fraction conversion calculator. Enter decimal inches, or millimeters, or fractions of an inch to convert and press tab. Not seeing your fraction? It’s possible that it’s not fully reduced, try simplifying the fraction first, or just use our calculator to convert a fraction to a decimal.Ĭhart showing common fractions and the equivalent decimal value. The chart shows fractions with denominators up to 20. Quickly look up the decimal value for a fraction or find the closest fraction for a known decimal value. The following chart shows all of the most common fractions and the equivalent decimal values. Save on Pinterest Save Share on Facebook Share Share on Twitter Tweet
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