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The United States and the Metric System (LC 1136) nist.gov Archive.org; The Metric System in the United States Archived June 11, 2017, at the Wayback Machine; A Metric America: A Decision Whose Time Has Come on nist.gov Archive.org; Metric Conversion Act of 1975 on nist.gov Archive.org; www.us-metric.org—U.S. Metric Association (mirror link)
The Metric Conversion Act of 1975 is an Act of Congress that was signed into law by U.S. President Gerald Ford on December 23, 1975. [1] It declared the metric system "the preferred system of weights and measures for United States trade and commerce", but permitted the use of United States customary units in all activities.
Over time, the metric system has influenced the United States through international trade and standardisation. The use of the metric system was made legal as a system of measurement in 1866 [165] and the United States was a founding member of the International Bureau of Weights and Measures in 1875. [166]
The Metric Act of 1866, also known as the Kasson Act, is a piece of United States legislation that legally protected use of the metric system in commerce from lawsuit, and provided an official conversion table from United States customary units.
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories [1] since being standardized and adopted in 1832. [2] The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country.
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Metric conversion may refer to: Converting a non-metric quantity to the metric equivalent; see " Conversion of units " Conversion of a country from non-metric units to metric units; see " Metrication "