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 mixednumber 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 mixednumber 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 righthand 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.