Weights & Measurements

Calculate Me - Shows conversions and calculations for temperature, weight, exchange rates and much more.
Conversion of Units - From the Institute of Chemistry at Freie Universität Berlin. Hundreds of units may be converted using the pull down boxes.
Dictionary of Measures, Units and Conversions - Provides a summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to change them into a 'standard' unit of the S I. Also has a selection of conversion calculators.
MegaConverter 2 - The "all new version of your favorite educational and research site, giving you a new, easier to use interface, with more converters, more features and quicker access."
Metric Conversion in JavaScript - Easy to use - simply fill in one value, click on calculate and see other unit equivalents for that value.
WWW Unit Converter - This easy-to-use resource has pull down boxes for units of input and output. Includes both British and American units.