How to Convert Inches to Decimals

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Inch measurements are most commonly given as mixed numbers, with the whole number of inches listed first and then the remaining fraction after (for example, 4 1/3 inches). Many people want to know how to convert these mixed-number fractions into decimals. The process will only take you a matter of seconds once you know the formula and have a calculator nearby. In addition to inches, this formula can be applied to all measurements whenever you want to convert them from mixed-number form to decimal form.

Things You'll Need

  • Ruler
  • Calculator
  • Measure the length or height and write it down (for example, 8 3/8 inches).

  • Divide the top number of the fraction on the right-hand side of the mixed number by its denominator (the number underneath it). Using the example in Step 1, you would divide 3 by 8 and get 0.375.

  • Write the measurement as a decimal, starting with the whole number of inches first, followed by a decimal point and the number you computed in Step 2. For example, 8 3/8 inches would be converted to 8.375 inches.

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