Length converter: inch → millimeter
Facts about the Inch
The inch (in) is a unit of length in the imperial and U.S. customary systems. It was historically based on the width of a human thumb, and standardized to exactly 25.4 millimeters in 1959. Inches are widely used in the United States for measuring screen sizes, furniture, tools, and construction materials.
Facts about the Millimeter
The millimeter (mm) is one-thousandth of a meter and is commonly used in fields that require precision, such as engineering, machining, and medicine. It is also widely used in tools like rulers, micrometers, and mechanical part specifications. Millimeters are ideal for measuring thickness, gaps, and tolerances.