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.

Efficient, powerful, cross-platform, and multi-language

• SpeedCrunch displays results as you type. Select a partial expression to evaluate only that part.
• Previous inputs and results are shown in a scrollable history and can be easily recalled. Customizable syntax highlighting allows you to spot mistakes easily.
• If you prefer the old-school way, an optional on-screen keypad is available as well.
• SpeedCrunch comes with over 80 built-in mathematical functions. You can also define your own functions.
• Variables allow you to store your results. Perform calculations with up to 50 digits of precision, using complex numbers, numeral bases, unit conversions, and more.
• Auto-completion allows you to speed up your task.
• A built-in formula book allows you to review and insert commonly used formulas, such as the volume of a cone.
• Or insert one out of over 150 built-in scientific constants.
• SpeedCrunch is available for Windows, MacOS, and Linux, and comes in several languages.