MM to inches converter. Easily convert millimeters to inches, with formula, conversion chart, auto conversion to common lengths, more. Quickly convert millimeters to inches or inches to millimeters with this easy-to-use calculator. Includes decimal precision, fractions, and step-by-step results. One millimeter is equal to 1/25.4 of an inch (in). Inch (in or ″) is a unit of length. One inch is equal to 1/12 of a foot (ft). One inch is equal to 1/36 of a yard (yd). One inch is equal to 25.4 millimeters (mm). 1 millimeter is equal to 0.03937007874 inches: Instant free online tool for inch to millimeter conversion or vice versa. The inch [in] to millimeter [mm] conversion table and conversion steps are also listed. Also, explore tools to convert inch or millimeter to other length units or learn more about length conversions.