## General Tables of Units of MeasurementThe data presented here is derived from publications of NIST, so it is in the public domain. However, this HTML implementation is not in the public domain. It is provided to make for easier access. In certain cases, particularly in scientific usage, it becomes convenient to provide for multiples larger than 1 000 and for subdivisions smaller than one-thousandth. Accordingly, the following prefixes have been introduced and these are now generally recognized:
Thus a kilometer is 1000 meters and a millimeter is 0.001 meter.
† By action of the 12th General Conference on Weights and Measures (1964) the liter is a special name for the cubic decimeter. ^{††}
In these tables where foot or mile is underlined, it is survey foot or U.S. statute mile rather than international
foot or mile that is meant.
^{†††}
^{†††}
†† This section lists units of measurement that have traditionally been used in the United States. In keeping with the Omnibus Trade and Competitiveness Act of 1988, the ultimate objective is to make the International System of Units the primary measurement system used in the United States. ††† Squares and cubes of customary but not of metric units are sometimes expressed by the use of abbreviations rather than symbols. For example, sq ft means square foot, and cu ft means cubic foot.
The present British gallon and bushel--known as the "Imperial gallon" and "Imperial bushel"--are, respectively, about 20 percent and 3 percent larger than the United States gallon and bushel. The Imperial gallon is defined as the volume of 10 avoirdupois pounds of water under specified conditions, and the Imperial bushel is defined as 8 Imperial gallons. Also, the subdivision of the Imperial gallon as presented in the table of British apothecaries fluid measure differs in two important respects from the corresponding United States subdivision, in that the Imperial gallon is divided into 160 fluid ounces (whereas the United States gallon is divided into 128 fluid ounces), and a "fluid scruple" is included. The full table of British measures of capacity (which are used alike for liquid and for dry commodities) is as follows:
The full table of British apothecaries measure is as follows:
(all underlined figures are exact)
Units of Length - International Measure
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Units of Length - Survey Measure
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‡ One international foot = 0.999 998 survey foot (exactly) One international mile = 0.999 998 survey mile (exactly) Note: 1 survey foot = 1200/3937 meter (exactly) 1 international foot = 12 x 0.0254 meter (exactly) 1 international foot = 0.0254 x 39.37 survey foot (exactly) NIST Document
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