KoalaCalc is a free multi-purpose calculator for Mac OS X. In its compacted state, it looks similar to the standard calculator that comes with Mac OS X. However, simply click the 'advanced features' box and KoalaCalc comes to life to become one of the most advanced scientific, conversion, statistical and expression calculators available.
The list of features includes:
Updated on Sep 26 2012
Note: This is a 32-bit application and it will not work on macOS Catalina or later