# Qalculate!

Qalculate! library and CLI

Repository: https://github.com/Qalculate/libqalculate
Canonical: https://ross.abutalabs.com/products/qalculate
Homepage: https://qalculate.github.io/
Language: C++
License: GPL-2.0
License Family: copyleft
Last push: 2026-08-23T18:41:12+00:00
Link (homepage): https://qalculate.github.io/

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 81, longevity 100
- inputs: {"age_days": 3744, "days_push": 10, "days_rel": 51, "gap_med": 49, "n_releases_24m": 14}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2633, forks 192 (observed 2026-08-28T04:07:06.167703+00:00)

## What it is
Qalculate! is a multi-purpose cross-platform desktop calculator library (libqalculate) with a CLI program (qalc) and GTK/Qt frontends. It combines everyday calculation tools with advanced features like symbolic math, unit conversion, arbitrary precision, and plotting.

## Use cases
- convert units and currencies from the command line
- solve equations and compute integrals symbolically
- calculate with arbitrary precision and uncertainty propagation
- do quick percent and everyday calculations
- plot mathematical functions
- embed a powerful math engine in other applications

## When to choose
- you need a powerful calculator with symbolic algebra and unit handling
- you want a CLI calculator for scripting or quick terminal math
- you need a C++ math evaluation library with a rich function library

## When to avoid
- you need a full computer algebra system like Mathematica or SymPy for heavy symbolic work
- you need a simple four-function calculator with minimal dependencies
- you need matrix-heavy numerical computing like MATLAB or NumPy

## Facets
- artifact type: library
- maturity: active
- function: math, cli, gui
- domain: mathematics, education, cross-platform
- platform: windows, cli, cross-platform, cpp
- tags: calculator, symbolic-math, unit-conversion, arbitrary-precision, currency-conversion, scientific-calculator, command-line, linux, macos

## Member repositories
- Qalculate/libqalculate (main) score 93
- Qalculate/qalculate-gtk (frontend) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:06.167703+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:19:34.596139+00:00, confidence not recorded.
  - readme: https://github.com/Qalculate/libqalculate (fetched 2026-08-28T04:07:06.167703+00:00, sha a851f65d3987)
  - homepage: https://qalculate.github.io/ (fetched 2026-08-29T10:02:18.535055+00:00, sha 95e6fec823b4)
- Data as of 2026-08-30T08:39:29.467469+00:00.