Das Unit Converter is an easy-to-use freeware program that can handle virtually all of your unit conversion needs. With over 2000 units, over 80 categories, and with the ability to add more (units and categories), you may never need to use an online converter or a search engine for unit conversions again! Some features include (full list): Online updating, world currency, conversion history, customizable outputs, support for math operations and functions, and much more. Das Unit Converter is 100% free software and 100% spyware, adware, and virus free.