Qalculate!
Hanna Knutsson
Download from the vendor
qalculate.github.io
A desktop calculator that understands units: you can type an expression such as force times lever arm with mixed units and get the result in the unit you want. It includes physical constants, arbitrary-precision arithmetic, uncertainty propagation and interval arithmetic, symbolic operations such as solving equations, differentiation and integration, and plotting. It replaces the pocket calculator for quick checks and unit conversions. Available with GTK and Qt interfaces and on the command line.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | Open-source licence (GPL-2.0). Free for any purpose including commercial work, with no time limit, no registration and no licence key. |
| Platforms | Linux, macOS, Windows |
| Engineering field | Architecture, Civil Engineering, Electrical & Electronics, Mechanical Engineering |
| Tool type | Engineering Calculators |
| Vendor site | qalculate.github.io |
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Last verified: 2026-10-05
