Engineering Calculator

Numi is a beautiful text calculator for Mac.

Open Source

Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.

SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .

Qalculate! is a multiplatform multi-purpose desktop calculator.

Open Source

fxSolver is an free online math solver, equation library, graphing calculator and science/engineering problem helper. To get started, add some formulas, fill in any input variables and press "Solve."

PTC Mathcad PTC Mathcad is Engineering Math Software That Allows You to Perform, Analyze, and Share Your Most Vital Calculations.

Tiny, powerful, free mathematical program with WYSIWYG editor and complete units of measurements support.

A smart notepad with a built in calculator

Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.

RealCalc Scientific Calculator

PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...

The smart calculator that does more! Convert units, get real-time currency rates, define variables, and tackle complex math with ease—all in one app.

Blockpad is spreadsheet software re-imagined for engineering. It gives engineers a better way to create, manage, and share critical calculations.