# Unit Conversion: How to Convert Centimeters to Inches and Millimeters to Inches

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## Converting Measurement Units

Let’s review some background information before we discuss how to convert centimeters to inches: [caption id=“attachment_131307” align=“aligncenter” width=“640”] 2.54 centimeters equals 1 inch![/caption]

Inches, Centimeters and Millimeters are all various units of length in different systems of measurement.

Centimeter is a unit of length in the metric system, equal to one hundredth of a meter and is the base unit for length in this system.

Millimeter is one tenth of a centimeter and is again a unit of length in the metric system.

An inch is used in both the Imperial system of units and the United States customary units as well as in other systems, and there are marginal differences between them.

For example, the most commonly accepted usage of the inch is the international inch which is 25.4 millimeters, while there is the metric inch measuring 25 millimeters.

## Formula for Converting Centimeters to Inches

1 inch = 2.54 centimeters 1 centimeter = 0.3937 inches (approx.) 1 centimeter = 10 millimeter Therefore, in order to convert from X inches to centimeters, multiply X by 2.54. Conversely, to convert from X centimeters to inches, divide X by 2.54 Similarly to convert from inches to millimeters, multiply by 25.4 and to convert from millimeters to inches, divide by 25.4 In order to understand unit conversions completely, it is necessary to know the various kinds of measures of length in different systems of measurement and how they relate to each other. Imperial System of Units 1 foot = 12 inches 1 yard = 36 inches Therefore, 1 yard = 3 feet 1000 thou = 1000 mil = 1 inch (or) 1 thou = 1 mil = 0.001 inches Metric System (or) SI Units 1 meter = 100 centimeters 1 centimeter = 10 millimeter For more information regarding unit conversion, refer to this article on physics help for high school students: performing unit conversions.

## Unit Conversion using Microsoft Excel

If you are working with a large amount of data, or with many measurements, then you probably will make use of spreadsheet software such as Microsoft Excel. While it is possible to enter the above mentioned mathematical formula into a cell in order to perform unit conversions, there is a more elegant method to do so. One can make use of functions in Microsoft Excel in order to perform unit conversions. The syntax is =CONVERT(Number, From_Unit, To_Unit). This needs to be entered within a cell in MS Excel. Example 1 Here’s how to convert centimeters to inches, make use of =CONVERT(1, “cm”, “in”) Example 2 To convert millimeters to inches, make use of =CONVERT(1000, “mm”, “in”)