PCalc is described as 'The powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator. It includes an optional RPN mode and multi-line display, a choice of button layouts, an extensive set of unit conversions and constants, a' and is a Calculator in the education & reference category. There are more than 100 alternatives to PCalc for a variety of platforms, including Android, Windows, Web-based, iPhone and Mac apps. The best PCalc alternative is Wolfram Alpha, which is free. Other great apps like PCalc are SpeedCrunch, Fossify Calculator, Qalculate! and OpenCalc.