Download: http://archive.info-mac.org/sci/calc/iunit.hqx
iUnit is a powerful unit conversion utility. It converts between over 500
different units of distance, mass, volume, velocity, density, currency, and
other types of units. iUnit also includes the values of many physical
constants.
iUnit is shareware, with a $20.00 registration fee.
Info-Mac
The original online Mac user community. Bringing Mac users together since 1984.