This class makes unit conversion verry simple. You only have to call one function to convert a value from one unit to another.
It is also verry simple to add your own units to the class using xml.
Currently the class supports following units:
- Area
- Data
- Energy
- Length
- Time
- Volume
- Weight
But I am willing to add any units, just post a comment 
You can view the documentation online at:
http://jerodev.net84.net/uconv/doc/