Measurement Conversion Sites

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http://www.digitaldutch.com/unitconverter/" onclick="window.open(this.href);return false;" rel="nofollow
http://www.sciencemadesimple.com/conversions.html" onclick="window.open(this.href);return false;" rel="nofollow
http://people.virginia.edu/~rmf8a/convert.html" onclick="window.open(this.href);return false;" rel="nofollow

Google also does conversions. For example, enter '4 kg in pounds', and hit enter. The result will be at the top of the page.