A cross-platform scientific and programmer calculator built with Electron, supporting both algebraic and RPN entry modes.
by Richard Lesh
Algebraic Mode — Standard infix expression entry with parentheses and operator precedence.
RPN Mode — Classic 4-level stack (T, Z, Y, X) with Enter to push, stack lift on new input after operations, and full stack manipulation (swap, roll up, roll down, drop).
- 2nd (alt/option key) toggles alternate functions: sin⁻¹, cos⁻¹, tan⁻¹, sinh⁻¹, cosh⁻¹, tanh⁻¹, log₂, 2ˣ, logᵧ, xʸ
- Rad/Deg toggles angle mode for trigonometric functions
- EE enters scientific notation exponent
- Base switching: 8 (octal), 10 (decimal), 16 (hexadecimal)
- Binary display: 64-bit binary view with nibble grouping (toggle show/hide)
- ASCII/Unicode toggle buttons
- Digits ≥ base are automatically disabled
- Alt/Option key toggles second functions RoL RoR, X RoL Y, X RoR Y
| Operation | Description |
|---|---|
| AND | Bitwise AND |
| OR | Bitwise OR |
| XOR | Bitwise exclusive OR |
| NAND | Bitwise NAND (NOT AND) |
| NOR | Bitwise NOR (NOT OR) |
| XNOR | Bitwise XNOR (NOT XOR) |
| NOT | Bitwise complement |
| NEG | Two's complement negation |
| << / >> | Shift left/right by 1 |
| X<<Y / X>>Y | Shift left/right by Y bits |
| RoL / RoR | Rotate left/right (64-bit) |
| mod | Modulo |
| flip₈ | Byte-reverse (8-bit) |
| flip₁₆ | Word-reverse (16-bit) |
| 00 | Append 0x00 to input |
| FF | Append 0xFF to input |
| Format | Description |
|---|---|
| Auto | Shortest representation (like %g) |
| Fixed | Fixed-point (like %f) |
| Scientific | Scientific notation (like %e) |
| Engineering | Scientific with exponents as multiples of 3 |
Select 0–15 decimal places. Applies to Fixed, Scientific, and Engineering formats. In Auto mode, precision controls significant digits when set.
- Enter: Pushes current value onto stack (duplicates X into Y)
- Stack lift: After operations, typing a new number lifts the stack (previous result moves to Y)
- After Enter: Stack lift disabled — next typed number replaces X without lifting
- C: Clears X only; button changes to AC to clear entire stack
- x↔y: Swap X and Y registers
- R↓: Roll stack down (X → T, T → Z, Z → Y, Y → X)
- R↑: Roll stack up (T → X, X → Y, Y → Z, Z → T)
- drop: Remove X, shift stack down, T fills with 0
| Key | Action |
|---|---|
| 0–9 | Digit entry |
| . | Decimal point |
| + - * / | Arithmetic operators |
| Enter or = | Evaluate / Enter (RPN) |
| Backspace | Delete last digit |
| Escape | Clear |
| ( ) | Parentheses (algebraic only) |
| A–F | Hex digits (programmer, base 16) |
- Mode: Algebraic / RPN
- Layout: Scientific / Programmer
- Precision: 0–15 decimal places
- Display: Auto / Fixed / Scientific / Engineering
- Node.js (v18 or later)
- npm
git clone https://github.com/richlesh/BengalCalc.git
cd BengalCalc
npm installnpm start# All platforms and architectures
npm run dist:all
# Individual builds
npm run dist:mac:x64 # macOS Intel
npm run dist:mac:arm64 # macOS Apple Silicon
npm run dist:win:x64 # Windows x64
npm run dist:win:arm64 # Windows ARM64
npm run dist:linux:x64 # Linux x64
npm run dist:linux:arm64 # Linux ARM64Output files are placed in the dist/ folder.
BengalCalc/
├── main.js # Electron main process
├── calc-engine.js # Calculator engine (RPN + algebraic)
├── index.html # Main calculator window
├── styles.css # Calculator styles
├── settings.html # Settings window
├── settings.js # Settings module (load/save)
├── about.html # About dialog
├── license_dialog.html # License key entry
├── splash.html # Splash screen
├── config.json # App configuration
├── package.json # npm/electron-builder config
├── app_icon.png/.icns/.ico # App icons
├── sign-mac.sh # macOS code signing script
└── .github/workflows/ # CI/CD workflows
Generate a license key for a user:
python3 generate_license_key.py user@example.comGNU General Public License v3.0 — see LICENSE for details.
© 2026 Richard Lesh