- Conversion Tables - More than 40 different unit conversion tables.
- All Measures - Conversion table of non-metric measures into SI and CGS.
- How Many? - A dictionary of units of measurement: explanations of the metric system, System Internationale (SI), English customary system, and other modern measuring systems. Plus extensive links to other measurement-related Internet resources.
- 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.
- 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,
- SI Units - Reference information on the International System of Units (SI).
- Unit Conversions - Online conversions from physics units to other physics units. Includes a comprehensive set of units with definitions.
- 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.
- SI Guide - Provides translation of unit and prefix names for the international metric system (SI) into various languages. For some, transliterations are also given.
- IEER Technical Classroom - Table of conversion factors for selected units relevant to nuclear topics.
- Temperature Converter - Converts Fahrenheit to Celsius and vice versa.
- Units of Measurement - Conversions and equivalences of the principal units of measure of the SI and Anglo-Saxon systems.
- NIST Metric Information and Conversions - Factsheets, regulations and conversion tools. Official site of the United States Metric Program.
- National Weights and Measures Laboratory (UK) - Official imperial-to-metric conversion tables.
- The Modern Metric System - Dictionary of metric units explaining the principles and history of the system.
- UK Metric Association - Pressure group campaigning for the completion of metrication in the UK. History, legislation, and practical help.
- Metric Conversion Tables - Conversion factors and online calculators for metric and imperial units.
- Temperature Converter - Simple Celsius-Fahrenheit conversions.
- Anglo-Saxon Weights & Measures - Catalogue of traditional British units with historical notes.
- The Metric System - Outline of the metric system with emphasis on applications in physics.
- British Weights and Measures Association (BWMA) - Pressure group opposing compulsory metrication. Political, consumer and transport information, discussion boards and links.
- Metric Conversion Tables to Imperial Measurements - Standard-to-metric conversion factor tables with definitions, derived units and prefixes.
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