Units Calculator is a Web interface to the
GNU
Units utility which allows conversion among thousands of
physical units, constants, and currencies. Units Calculator
may be used to perform complex scientific and engineering
calculations involving physical units and guards against
common errors due to dimensional incompatibility. Units
Calculator is 100% compatible with GNU Units, but as a Web
application can be used from any platform with a Web browser.
Currency exchange rates and precious metal prices are updated
daily. See the Introduction
for a tutorial, or proceed directly to the
Expert page, which contains
a click-to-copy table of common units.