apps.AppDB

UnitConverter allows you to convert for practical purposes units of Weight, Temperature, Length, Volume & Speed form the Imperial Unit System (used in English-speaking countries) to the Metric Unit System (used in the rest of the World) and vice-versa
This is a very easy to use app.

According to the US CIA World Factbook in 2006, the International System of Units is the official system of measurement for all nations except for the United States, the United Kingdom, Hong-Kong, Burma, Liberia

Imperial units or the imperial system is a system of units, first defined in the British Weights and Measures Act of 1824, later refined (until 1959) and reduced. The system came into official use across the British Empire.

The metric system is an international decimalised system of measurement, first adopted by France in 1791, that is the common system of measuring units used by most of the world. It exists in several variations, with different choices of fundamental units, though the choice of base units does not affect its day-to-day use. Over the last two centuries, different variants have been considered the metric system. Since the 1960s the International System of Units ("Système International d'Unités" in French, hence "SI") has been the internationally recognised standard metric system