Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimetres and inches. Type in your own numbers in the form to convert the units! You can do the reverse unit conversion from inches to mm , or enter any two units below:. A millimetre American spelling: millimeter, symbol mm is one thousandth of a metre, which is the International System of Units SI base unit of length.
The millimetre is part of a metric system. It is simple and logical and consists of units and prefixes. Conversion is a multi-step process that involves multiplication or division by a numerical factor, selection of the correct number of significant digits, and rounding.
The following sections are intended as a guide through this multi-step process. The activities of everyday life have always been affected either directly or indirectly by measures and conversions:.
Primary Menu. Search for: Search. Please provide values below to convert millimeter [mm] to inch [in], or vice versa. It indicates one thousandth of the base unit, in this case the meter. The definition of the meter has changed over time, the current definition being based on the distance traveled by the speed of light in a given amount of time. The relationship between the meter and the millimeter is constant however. Prior to this definition, the meter was based on the length of a prototype meter bar.
In , the meter has been re-defined based on the changes made to the definition of a second.
0コメント