NIST Metric Information and Conversions
Factsheets, regulations and conversion tools. Official site of the United States Metric Program.
Online Conversion
Offers conversion tools for length, volume, temperature, astronomical, clothing sizes, computer bytes, cooking measurements, time zones, density, energy, finance, flow rates, force frequency, and some fun pages.
Online Converters
Provide online javascript converters and calculators for converting metric to imperial units and vice-versa.
On-Line Measures Converter
Length, area, mass and weight, volume and capacity, temperature, angles, force, torque, electricals, cloth sizes, and some others.
Online Unit Converter
Personalizable, free, and available in five languages. It converts distance and length, area, capacity and volume, pressure, temperature, and speed.
Process Associates of America
Features tools for finding engineering conversion factors.
Ron's Hard Conversion Tools
Online unit conversion calculators for volume, distance, weight, and temperature units. Also includes number conversion (decimal, hex, and binary) and a tool to convert characters to or from ASCII codes.
Science Made Simple
Online metric converter gives U.S. customary and metric 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.
SI Units
Reference information on the International System of Units (SI).
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