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Metric Converters and Charts
Measurement conversion calculator for metric and imperial systems. Includes metric charts, tables.
Other Useful Resources
International Bureau of Weights and Measures (BIPM)
BIPM is an international standards organisation (one of the 3 organizations) to maintain the International System of Units (SI) under the terms of the Metre Convention.
Wikipedia - Metric System
Information about metric system, history, units.
Wikipedia - Imperial Units
Information about imperial system, history, units.
Wikipedia - U.S. Customary Units
Information about US customary units, history.