This is a C# built Excel add-in (XLL) which provides unit conversions based on a database of unit types. It parses units from a string and converts them to a common SI form. From there, it can convert to any desired output form that is dimensionally consistent with the input.
This add-in was created at a time when I was doing a significant amount of engineering work in various units.
Full documentation available as PDF.
Example of formula input and result
Form to display and edit current unit database.
Form to change the database location
