Online calculators and other resources for converting one unit of measurement into another.
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Conversion table of non-metric measures into SI and CGS.
Offers a wide variety of unit conversion tools and conversion charts for fast lookup.
British Weights and Measures Association (BWMA)
Pressure group opposing compulsory metrication. Political, consumer and transport information, discussion boards and links.
Conversion Factors for Energy Equivalents
Physics laboratory of the National Institute of Standards and Technology (NIST) sponsors and maintains this reference resource of CODATA-recommended values of fundamental physical restraints.
English Weights and Measures
History and usage of English/Imperial/customary weights and measures, with conversion factors, and pictures. Minims, drachms, pecks, bushels, rods, poles, perches, furlongs, ounces, fathoms, pints, gallons, nails, chains, chaldrons, tods, crowns, florins, groats, farthings and guineas.
The Foot Rule
Convert units from one measure to another (e.g. meters to yards, liters to gallons). A very extensive collection of units and categories. Includes usage and definitions descriptions of units and categories.
International System of Units
Definitions of SI units and SI prefixes, units outside the SI, rules and style conventions, historical context for SI units, international aspects of the SI, and unit conversions.
Metric 4 US
A site promoting the metric system which argues why metric is better and English is worse. Provides an English-metric online calculator.
Metric Conversion Tables to Imperial Measurements
Standard-to-metric conversion factor tables with definitions, derived units and prefixes.
National Measurement and Regulation Office (UK)
Includes information about the National Measurement System, legislation and guidance, services to industry, and its enforcement role.
SI Units, Conversion and Measurement Skills
Book by Wacek Kijewski on experimental science in metric units. Includes problems, guided solutions, fun facts, data handling and metric conversion tests.
UK Metric Association
Pressure group campaigning for the completion of metrication in the UK. History, legislation, and practical help.
Units of Measurement
Conversions tables and equivalences of the principal units of measure of the SI and Anglo-Saxon systems.
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