free42-decimal ☆

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Description:
HP-42S calculator simulator

Type: Cask | Latest Version: 3.3.11@0 | Tracked Since: Dec 17, 2025

Links: Homepage | formulae.brew.sh

Category: Productivity

Tags: calculator rpn scientific simulation hp42s education

Install: brew install --cask free42-decimal

About:
Free42 is a precise simulation of the HP-42S RPN scientific calculator, faithfully replicating its functionality and appearance. The Decimal version uses decimal arithmetic to provide exact results, making it ideal for financial and engineering calculations where floating-point errors are unacceptable. It runs as a native application on macOS and includes features like unit conversions and a programmable equation library.

Key Features:

Exact decimal arithmetic for error-free calculations
Faithful HP-42S feature replication including programming
Native macOS application with a high-resolution display
Comprehensive unit conversion and physical constants libraries

Use Cases:

Financial calculations requiring exact decimal precision
Engineering and scientific problem-solving with RPN
Learning and using the classic HP-42S calculator logic
Running legacy HP-42S programs and software

Alternatives:

hp42s – A different emulator implementation, may not have native macOS UI
free42-binary – The binary floating-point version of Free42, less precise for financial use
emacs-free42 – Runs Free42 within Emacs, for users who prefer an editor-integrated workflow

Version History

Detected	Version	Rev	Change	Commit
Jan 13, 2026 7:04pm	3.3.11	0	VERSION_BUMP	a777f40d
Sep 15, 2025 11:39am	3.3.8	0	VERSION_BUMP	fb2ef123