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US customary units

the United States as English units (but see English unit) or standard units, are units of measurement that are currently used in the USA, in some cases alongside units from SI (the International System of Units — the modern metric system). All units are defined in terms of SI base units, but at ratios inconvenient for conversion.

Wikipedia and Wikis

U.S. customary units - Wikipedia
http://en.wikipedia.org/wiki/U.S._customary_units

Other

Online metric conversions
http://www.sciencemadesimple.com/conversions.html
46 page PDF file
http://ts.nist.gov/ts/htdocs/200/202/SP%20447.pdf
Online unit converters of length, weight, volume, area, and hundreds more
http://www.unitconversion.org
Anglo-Saxon weights & measures
http://users.aol.com/jackproot/met/spvolas.html
Appendix C, NIST Handbook 44, 2002 edition
http://ts.nist.gov/ts/htdocs/230/235/h442002.htm

Keywords and Synonyms

US customary units, U.S. customary unit, English units, US units of measurement, United States Customary System, Table of US Weights and Measures, U.S. Customary System of weights and measures, United States System of Liquid and Dry Measures