Convert Inches to MM

Please provide values below to convert inch [in] to millimeter [mm], or vice versa.

Inch (symbol: in) is a length unit in the imperial and US customary systems of measurement. Since 1959, an inch was defined to be equivalent to 25.4 millimeters exactly in 1959. There are 12 inches in a foot and 36 inches in a yard.

Millimeter (symbol: mm) is a length unit in the SI (International System of Units). A millimeter equals to one thousandth of a meter.