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Online Unit Converters

Arachnoid Converter (double click on units to be converted into)

Convertit (use American spelling of liter, meter, etc)

Unit Convert

Process Associates of America Conversion Site

Online Conversion

Time Zone Converter

Unit Conversion Factors

Measurement Conversions

Units of Measurement

A Dictionary of Units of Measurement

International System of Units (SI) - essentials, background, and bibliography on the SI, the modern metric system.