How to Convert Inches to Metric Millimeters

The metric or international system defines a meter as the basic unit of measurement. One millimeter denoted as "mm" corresponds to 1/1000 of a meter and is equivalent to 1/10 of a centimeter. However, the Customary System adopted in the United States uses different units -- inches, for example. Use a calculator to convert a measurement in inches to millimeter units.

Instructions

1

Consider the basic relationship: 1 inch = 2.54 centimeters.

2

Multiply the length in inches by 2.54 to convert it to centimeters; for example if the length is 11.45 inches then 11.45 x 2.54 = 29.083 centimeters.

3

Multiply centimeters by 10 to convert the length to millimeters; in the example, 29.083 centimeters x 10 = 290.83 millimeters.