APCalculator 20150111 for Mac can be downloaded from our website for free. The application is included in Theming Tools. This Mac download was checked by our built-in antivirus and was rated as malware free.
From the developer:
Though APCalculator (Arbitrary Precision Calculator) is initially set to 64 decimal digits internal precision, with 32 decimal digits displayed, this calculator can be set to any desired precision. Initial operating mode is RPN, which approximates the user interface of the HP-48/49 series calculators. Numeric display, even while entering numbers, features standard digit grouping.
You may want to check out more Mac applications, such as Cisdem WindowManager for Mac or Scrapbook with Neko, which might be similar to APCalculator.