This online imperial to metric unit converter supports conversions from inches (in), feet (ft), yards (yd), miles (mi), nautical miles (M), and leagues (lea) to nanometers (nm), micrometers (μm), millimeters (mm), centimeters (cm), decimeters (dm), meters (m), and kilometers (km). It uses the standards defines by the International System of Units and ISO standards on quantities and units [1][2], with the league being the exception, as there is no single definition for it - we are using the U.S. standard league. Imperial vs. Metric units of length The metric system is a relatively modern system of units and is the official system for most countries in the world. It is used in all sciences, in engineering, navigation, etc. Its base unit is the meter, initially defined by a metal bar standard, but then redefined more precisely as the distance light travels in a vacuum in 1/299,792,458 seconds. Please Note: any reference to 'Royal Mail 24 ™' and 'Royal Mail 48 ™' are Official Royal Mail Service names and should not be interpreted as '24 Hour Delivery' and '48 Hour Delivery'. The Imperial system, sometimes referred to as the English system of units is an old system of measurements that was used throughout human history, with evidence of its use in ancient Greece, ancient Rome, the Middle ages, and more. It is currently used only in the United States, United Kingdom, and a couple of other countries, and even there it is defined by using the meter as a de facto base unit. Historically the definitions of the imperial units varied with time and place, but were set relative to the standard meter by a 1959 international treaty.

Our converter supports many different pairs of units, so we provide examples on how to perform unit conversions for only the most popular pairs. Inch to cm conversion example

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