Convert 1 inch to mm . How many mm in an inch ? Our free converter quickly and accurately converts 1 inch to Millimeters, offering reliable results and calculations Learn how to convert 1 inch to millimeters using a simple formula and a conversion table. Find out how many millimeters are in 1 inch and see alternative spellings and languages for inch and millimeter. Inch 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 ). Millimeter Millimeter ( mm ) is a unit of length. One millimeter is equal to 1 /1000 of a meter (m). One millimeter is equal to 1 /10 of a centimeter (cm). One millimeter is equal to 1 /25.4 of an inch (in). How to convert inches to millimeters 1 inch is equal to 25.4 millimeters: 1 ″ = 25.4mm The distance in millimeters ( mm ... Inch to Millimeter (in to mm ) length conversion table & formula on Convert App.