The Free Software Foundation's "units" unit conversion and calculation utility. GNU units converts quantities expressed in various scales to their equivalents in other scales. Units can only handle multiplicative scale changes. For example, it cannot convert Celsius to Fahrenheit but it can convert temperature differences between those temperature scales. The units are defined externally in an extensive, well annotated data file that defines over 2000 units. You can also provide your own data file. WWW: http://www.gnu.org/software/units/ Note that this port will install the utility with a 'g' prefix, e.g. gunits, but the texinfo documentation will refer to it without the 'g' prefix.