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. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.
An inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and 12 inches in a foot. The inch is usually the universal unit of measurement in the United States, and is widely used in the United Kingdom, and Canada, despite the introduction of metric to the latter two in the s and s, respectively. The inch is still commonly used informally, although somewhat less, in other Commonwealth nations such as Australia; an example being the long standing tradition of measuring the height of newborn children in inches rather than centimetres.
The international inch is defined to be equal to Definition: An inch symbol: in is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly There are 12 inches in a foot and 36 inches in a yard. There have been a number of different standards for the inch in the past, with the current definition being based on the international yard.
One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.
It is also sometimes used in Japan as well as other countries in relation to electronic parts, like the size of display screens. From: millimeter To: inch. Millimeter to Nautical Mile international.
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