Convert.net – Online Conversions
http://www.convert.net/

Convert.net is an online conversions calculator for a variety of unit measurements featuring natural language queries. You can use Convert.net to sum up a list of numbers, convert from pounds to kilograms, or evaluate any other mathematical expression. Convert.net can evaluate mathematical expressions involving basic arithmetic, advanced math and logic, and conversions of a large number of unit measurements in different fields. This will be added to the tools section of Research Resources Subject Tracer™ This will be added to Reference Resources Subject Tracer™ .