Imperial and Metric Units' Online Conversion 

📏 During the French Revolution, many people in France realized that their numerous local measures and weights systems of measurement were archaic, needed to be changed and  ideally  unified. That's exactly what Charles Maurice de Talleyrand wanted to implement: a radical change in regard to the way units were to be measured. In 1790, he proposed to the French National Assembly the development of a new system. Other nations were also asked to cooperate. Great Britain did not want anything to do with the creation of a new system of measurement though. 📏 In 1791, the French Academy of Sciences decided to set up a commission and one of its implementations was the standardized definition of length based on the size of the Earth. Length would now be defined via the metre, which would be equal to 1/10 000 000 of the length of the meridian arc from the equator to the north pole. 📏 The metric system follows a pattern that is decimal: units can easily be divided or multiplied by an integer power of ten. For example, 1/10 of a metre is a decimetre (0.1 metre), 1/100 of a metre is a centimetre (0.01 metre / cent in French means hundred) and 1/1000 of a metre is a millimetre (0.001 metre / mille in French means thousand). The hectometre is 100 metres and the kilometer is 1000 metres. The International System of Units (SI) now includes seven base units or, if you prefer, physical constants. The metre (length), the kilogram (mass), the ampere (electric current), the mole (amount of substance), kelvin (temperature), candela (light intensity) and the second (time). SI is always adapting to new technologies and the need to be as precise as possible. 📏 Hence, in the SI, the metre is defined as 1 / 299 792 458 of the distance light can travel in one second. As for the kilogram, initially defined as the mass of one cubic decimetre of water at 4 degrees Celsius, it is now defined by SI via the Planck constant. 📏 In 1975, the United States' Metric Conversion Act did declare that the metric system was the preferable system for weights and measures but it did not suspend the use of other units in the country. As of today, the United States does not use the metric system on a wide scale. For more information on the metric system: Britannica. Metric system. Bureau International des Poids et Mesures. The International System of Units (SI). Wikipedia. Metric system. 
Worldwide use of the Metric System and Date of Metrication* The United States of America,
Burma and Liberia have not yet adopted the Metric System (SI). 


Conversion tables and results shown on this website are for information purposes only.
Robert Radford, M.A. (Quebec, Canada) © MMXXII