Plus42

Plus42 is a sophisticated and fully-featured calculator software that consolidates the capabilities of multiple specialized devices into one compact package. Inspired by the Free42 project, it is a faithful digital recreation of the legendary HP-42S programmable RPN calculator, which was produced until the late 1990s. It offers a complete suite of tools for engineers, scientists, students, and professionals, handling everything from basic arithmetic to advanced programming, complex equations, and statistical analysis. Its Reverse Polish Notation (RPN) logic provides an efficient, stack-based workflow that minimizes keystrokes and reduces errors. All this powerful functionality is delivered in a clean, intuitive interface, making high-precision computation accessible anywhere.