Inch to Millimeter Converter

Inch

The inch (symbol: in or ″) is a unit of length in the British imperial and the United States customary systems of measurement. It is equal to 1/36 yard or 1/12 of a foot. The word inch has been derived from the Roman word uncia (meaning 'twelfth'). There are 12 inches in a foot. Currently an inch is defined as exactly 25.4 millimeters.

Inch is regularly used in Britain and the Commonwealth countries like India, Australia, Canada etc. It is often used to express the height of a person (for example, 'John is 5 feet 9 inches (5′ 9″)'). In most of continental Europe, the inch is also used informally as a measure for display screens. (e.g. 42 inch TV)

Millimeter

The millimeter (symbol: mm) is a unit of length in the metric system, equal to one thousandth of a meter. Meter, as you know, is the SI base unit of length. Therefore, there are one thousand millimeters in a meter. There are ten millimeters in a centimeter.

One millimeter is equal to 1000 micrometers or 1000000 nanometers. Since an inch is officially defined as exactly 25.4 millimeters, a millimeter is equal to exactly 5⁄127 (≈ 0.03937) of an inch.

The millimeter is often used in day-to-day life for measuring small lengths. For example, pressure is measured in millimeters of mercury (mmHg). A sheet of paper is typically between 0.07 mm and 0.18 mm thick, with ordinary printer paper or copy paper approximately 0.1 mm thick. More information

Inches To Millimeters Table