plus42-decimal ☆

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Description:
RPN calculator based on HP-42S

Type: Cask | Latest Version: 1.3.13@0 | Tracked Since: Dec 28, 2025

Links: Homepage | formulae.brew.sh

Category: Productivity

Tags: calculator rpn scientific hp42s mathematics productivity

Install: brew install --cask plus42-decimal

About:
Plus42 Decimal is a powerful RPN calculator application that faithfully emulates the HP-42S scientific programmable calculator. It offers high-precision decimal arithmetic, making it ideal for engineering, scientific, and financial calculations where accuracy is paramount. The application includes a full-featured programmable environment and supports extensive binary and decimal number handling.

Key Features:

High-precision decimal arithmetic engine
Full HP-42S function and programming compatibility
Support for binary numbers and hexadecimal operations
Large display showing stack, registers, and status
Extensive user programmability with custom functions

Use Cases:

Scientific and engineering calculations requiring high precision
Financial modeling and currency computations
Learning and practicing RPN (Reverse Polish Notation) logic
Legacy HP-42S program execution and development

Alternatives:

Free42 – Plus42 offers decimal arithmetic and extended features, while Free42 focuses on binary floating-point emulation.
Numi – Numi is a modern macOS calculator with a focus on natural language input, whereas Plus42 is a dedicated RPN emulator.

Version History

Detected	Version	Rev	Change	Commit
Jan 13, 2026 7:35pm	1.3.13	0	VERSION_BUMP	7867258e
Sep 15, 2025 12:47pm	1.3.10	0	VERSION_BUMP	60dac019