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Conversions of Fractional Inches and Millimeters

Conversions of Fractional Inches and Millimeters

Use this table to easily convert millimeters into fractions of inches or decimal inches.

  • Convert the fractional number after the hyphen to a decimal, i.e. divide numerator by denominator (see chart) ... 11 by 64 = 0.171875
  • Replace the zero of the intermediary result with the integer of your basis ... thus 0.171875 becomes 3.171875.
  • To convert in millimeters (centimeters) mulitply this inch-decimal by 25,4 (2,54): 3.171875 x 25,4 = 80,566 mm