Free42

Free42 is a scientific calculator that brings the legendary HP-42S to your Android device. Whether you're an engineer, student, or professional who relies on advanced calculations, this faithful re-implementation delivers the precision and functionality of the original without requiring any proprietary files.

Experience full HP-42S compatibility with a complete, modern rewrite built from the ground up. Access hundreds of mathematical functions, matrix operations, and programming capabilities that professionals have trusted for decades. The integrated printer simulation—reimagining the HP-82240—lets you view and manage calculation history directly on your screen.

Free42 is built on open-source principles, released under the GNU General Public License. All code is either public domain or licensed compatibly, ensuring transparency and community trust. Whether you're solving complex equations, running statistical analyses, or writing custom programs, Free42 delivers calculator power with no hidden dependencies.

Download Free42 today and get professional-grade calculation tools completely free.