Software · Utilities & files

Qalculate! (Qt UI)

Qalculate! (Qt UI) is a calculator, available on Windows and Linux.

Completely free
Windows and Linux
Open source
No account

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Flathub, Winget (Windows Package Manager)
License: GPL-2.0+ — Open source (copyleft)confirmed by Flathub, Winget (Windows Package Manager)
Open source: Yes
Commercial use: Yesconfirmed by Flathub, Official plan pages (pricing, licence, terms), Winget (Windows Package Manager)
Account required: Noconfirmed by Winget (Windows Package Manager)
Credit card required: Noconfirmed by Flathub, Winget (Windows Package Manager)
Watermark: Not applicable
Ads: not documented
Platforms: Windows and LinuxEstablished by Linux: Flathub · Windows: Winget
Publisher: Hanna Knutsson
Latest version: 5.13.0 (5 October 2026)
Latest activity: 27 October 2026
Source code: github.com/Qalculate/qalculate-qt

At a glance

Qalculate! (Qt UI) is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-2.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

About

Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation). Features include a large library of customizable functions, unit calculations and conversion, physical constants, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic, plotting, and a user-friendly interface.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 10 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 7 November 2026
Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from Flathub — AppStream (Flathub)

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