Online Conversion
http://www.onlineconversion.com

Measurement Conversions
http://www.sciencemadesimple.com/
conversions.html

Measure 4 Measure
http://www.wolinskyweb.net/measure.htm

Measurements Converter
http://www.convert-me.com/en/

Linear Conversion Calculator
http://www.geocities.com/
Heartland/7130/linear.html

Volume Conversion Calculator
http://www.geocities.com/
Heartland/7130/volume.html

CalculateMe.Com - Calculation & Conversion Utility
http://www.calculateme.com/

Temperature Conversion Calculator
http://www.geocities.com/
Heartland/7130/temperature.html

Temperature Conversion Calculator
http://chemistry.berkeley.edu/links/
temperature.html

Metric Conversion Factors
http://www.wsdot.wa.gov/Reference/metrics/

A Dictionary of Units of Measurement
http://www.unc.edu/~rowlett/units/index.html

For on-line calculators, see Mathematics