To calculate a inch value to the corresponding value in mm, just multiply the quantity in in by 25.4 (the conversion factor). Here is the formula:

4.5cmto mm

A millimeter (mm) is a decimal fraction of the meter, The international standard unit of length, approximately equivalent to 39.37 inches.

4.5inchtocm

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An inch is a unit of length or distance in a number of systems of measurement, including in the US Customary Units and British Imperial Units. One inch is defined as 1⁄12 of a foot and is therefore 1⁄36 of a yard. According to the modern definition, one inch is equal to 25.4 mm exactly.