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How to Convert Millimeters to Inches

Meters are a measurement of length, and metric rulers and tape measures are graduated in Meters. These are broken down into 100 centimeters, which in turn are broken into 10 millimeters. Centimeters are 1/100th of a meter. Likewise millimeters are 1/1000th of a meter. Therefore 25.4 or 25&4/10th millimeters equals one inch. A good rule of thumb to use is that an inch is approximately 2 ½ centimeters, but if you need more accuracy,

Things You'll Need

  • Metric ruler
  • Imperial ruler
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Instructions

    • 1

      Measure a length with a tape measure or ruler. If you use a metric ruler then convert this measure into the Imperial measure.

    • 2

      Convert the millimeter measurement to inches by dividing the millimeter figure by 25.4. For instance if the length measured is 2,540 mm you will divide this by 25.4. eg
      2540mm = 100"
      25.4

    • 3

      To convert from an Imperial (Inches) measure do the converse. Multiply the inches measurement by 25.4. Using the above example,
      100" x 25.4 = 2540mm

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