- All Measures
- Offers a large conversion table, an online converter of units of measure.
- British Weights and Measures Association
- Advocacy group promoting British weights and measures instead of using a compulsory use of metric system.
- The Case for Change
- Presenting the UK Metric Association's campaign and arguments on completing the changeover to the international metric system. Includes discussions on which is the better system and the problems associated with having two systems of measurement.
- Convert.net
- Online conversions calculator for a variety of unit measurements featuring natural language queries.
- English Weights and Measures
- Information on Imperial weights and measures.
- How Many?
- Offers a full dictionary of units of measurement.
- Math Connect
- Online source for metric conversions and other various types of calculations.
- Metric 4 US
- Presents arguments in favor of adopting the metric measurement system and points out the flaws or disadvantages of the English system.
- Metric Conversion Tables
- Free online resource useful in converting measurement units into their metric derivatives.
- Metric Conversion.us
- Contains a length conversion table between metric and English units.
- Metric Conversions
- Featuring online conversion calculators and charts for a wide variety of measurement conversions including temperature, length, area, volume and weight.
- Metric Information and Conversions
- Presents conversion tools, metric publications, educational resources, and related news and links.
- NIST International System of Units
- Provides a reference on constants, units, and uncertainty.
- NIST Metric Information and Conversions
- Find common conversion factors such as metric to inch-pound and inch-pound to metric. Also provides conversion tools, publications and information.
- NWML: Metric Conversions
- FAQ sheet published by the UK National Weights and Measures Laboratory. Answers questions related to metric conversions and the units of measurement no longer used for trade.
- SI Metric
- Table of metric conversions with details on scientific notations and SI unit descriptions.
- Unit of Measure Conversion Equivalences
- Provides information about the international system of units (SI), SI prefixes, fundamental physical constants, and SI base and derived units.
- Universcale
- Flash site designed to allow users to experience and compare the sizes of various objects - from the smallest to the largest.
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