Inches to millimeters Converter
How many millimeters in 1 inch?
There are 25.4 millimeters in 1 inch. To convert any value in inches to millimeters, just multiply the value in inches by the conversion factor 25.4. So, 1 inch times 25.4 is equal to 25.4 millimeters. See details below and use our calculator to convert any value in inches to millimeters.


Definition of InchAn 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. 

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

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