2024-07-23 00:00:00 PowerCalc is inspired by the Hewlett-Packard calculators, using RPN logic. User guide: https://sites.google.com/view/powercalc-user-guide/home Be warned, if you are looking for a "normal" calculator and you have no idea how an HP calculator works or what Reverse Polish Notation (RPN) is, then you may need a couple of hours to get used to the new way of thinking when operating this calculator. However, many who tried RPN prefer how this system makes it easier to organize a calculation, store intermediate results, and to make programs. Google "RPN tutorial" and get started, don't complain that this isn't a normal calculator.