The UnitConverter application provides unit conversioncapability. It allows conversion betweeen arbitrary unit expressions as well as quantity expressions including temperature-like unit conversions. These features are made possible by the use ofa UnitConversion database. The UnitConverter application also makes it possible to manipulate the UnitConversion database. You can defineyour own quantities, units and unit systems. You can perform dimensional analysis. This is quite simply the most powerful conversion program out there.