Caliber

A graphical calculator built with C++ and Qt6. Covers every calculation mode a STEM student needs — from basic arithmetic to university-level solvers across 22 modes.

Website · Releases · Issues

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Modes

Mode	Description
Basic	Arithmetic with live expression preview
Scientific	Trig, logarithms, powers, constants (π, e), DEG/RAD/GRAD
Programming	HEX/DEC/OCT/BIN, bitwise ops, 8–64 bit width, bit visualizer
Date	Date difference, add/subtract durations, age calculator, day of week
Conversion	13 unit categories + live currency conversion via API
Equations	Linear, quadratic, system solver (Gaussian), matrix operations
Graphing	2D/3D plotter, polar/parametric, zoom/pan/trace, integral shading, derivative overlay, intersections
Statistics	Descriptive stats, distributions, hypothesis testing, regression, ANOVA, chi-square, histogram
Calculus	Symbolic differentiation, integration (single/double/triple), limits, Taylor series, root finder
Financial	Compound interest, loans, NPV/IRR, percentage calculations
Number Theory	Primes, GCD/LCM, modular arithmetic, base conversion, sequences
Electrical	Ohm's law, RLC circuits, voltage dividers, op-amps, dB, phasors, power factor
Digital Logic	Truth tables, K-maps, number systems, flip-flops, adders, MUX/DEMUX, IEEE 754
Vectors	Arithmetic, dot/cross products, magnitude, angle, projection, line/plane equations
Physics	Kinematics, Newton's laws, energy, projectile motion, waves, thermodynamics, electrostatics
Chemistry	Molar mass, ideal gas law, pH, dilution, thermochemistry
Civil/Mech	Beam analysis, stress/strain, fluid mechanics, heat transfer, gears
Advanced Math	Complex numbers, linear algebra, series, triangle solver, polynomials, set theory
Discrete Math	Graph theory (BFS/DFS/Dijkstra), combinatorics, relations, recurrence, Boolean algebra
MCS	Asymptotic analysis, Master Theorem, floating point, formal logic, hashing
Signal Processing	DFT, filter design, sampling/Nyquist, convolution, transfer functions
Control Systems	Transfer functions, Routh-Hurwitz, PID tuning, steady-state error, state space

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Features

Solvers

• Step-by-step breakdowns across multiple modes (equations, calculus, statistics, vectors, etc.)
• Keyboard input — type directly using keyboard/numpad in Basic, Scientific, and Programming modes
• Live expression preview — see results as you type

Graphing

• 2D: Multiple functions, zoom/pan/trace, derivative overlay (f'), integral shading, intersection finder
• 3D: Surface plotter (requires OpenGL), auto-rotation, multiple surfaces
• Polar and parametric plotting modes
• Export plots as PNG/JPEG

Themes

• 9 built-in themes: Light, Dark, Midnight, Dracula, Nord, Monokai, Solarized, High Contrast, Follow System
• Custom Gradient Theme — pick any two colors, auto-derives all UI colors with luminance-based contrast
• Community themes — drop .qss files in ~/.config/Caliber/themes/
• Accent color override via View menu

Interface

• Resizable sidebar — drag to resize, shows full mode names
• History panel — search, filter, pin entries, export to TXT/CSV
• Formula Book — searchable reference with ~80 formulas across all modes
• Per-mode formula filtering — shows only formulas relevant to current mode
• Global solver search bar — jump to any mode+tab instantly
• Smooth mode transitions — cross-fade animation between modes
• Font size control — 10–18pt, persisted in settings

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Installation

Download the package for your platform from the Releases page.

Platform	Package	Install method
Ubuntu / Debian	caliber-2.0.0.deb	sudo dpkg -i caliber-2.0.0.deb
Fedora / RHEL	caliber-2.0.0.rpm	sudo rpm -i caliber-2.0.0.rpm
Arch Linux	PKGBUILD	makepkg -si
Any Linux	caliber-2.0.0.tar.gz	Extract and run
Windows	Caliber-2.0.0-Setup.exe	Run installer
Windows (portable)	Caliber-2.0.0-Windows-x64.zip	Extract and run caliber.exe
macOS	Caliber-2.0.0.dmg	Open and drag to Applications

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Linux — build from source

# Fedora / Ultramarine
sudo dnf install qt6-qtbase-devel qt6-qtcharts-devel qt6-qtdatavis3d-devel

# Ubuntu / Debian
sudo apt install qt6-base-dev qt6-charts-dev

mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
cmake --build . --parallel $(nproc)
sudo cmake --install .

Windows — build from source

windows\build.bat C:\Qt\6.8.0\msvc2019_64

macOS — build from source

brew install qt create-dmg librsvg
bash package/build_macos.sh

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Keyboard Shortcuts

Shortcut	Action
Ctrl+1 – Ctrl+7	Switch to mode 1–7
Ctrl+H	Toggle history panel
Ctrl+F	Toggle formula book
Ctrl+Shift+S	Theme: Follow System
Ctrl+Shift+L	Theme: Light
Ctrl+Shift+D	Theme: Dark
Enter	Calculate
Backspace	Delete last character
Escape	Clear

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Stack

• C++17
• Qt6 (Widgets · Charts · DataVisualization · Network)
• CMake 3.16+

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License

See LICENSE.