To convert measurements from one unit to another, there are many sites with interactive conversion calculators. My favorites are: Yahooligans! Weights and Measures, Convert Me, and Online Conversion.
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Feldman, Barbara. "Online Conversion Calculators." Surfnetkids. Feldman Publishing. 29 Sep. 2002. Web. 2 Oct. 2014. <http://www.surfnetkids.com/tech/224/internet-tip-of-the-week-42/ >.