A sleek, single-file HTML calculator with a cyberpunk / retro-futuristic aesthetic. Zero dependencies, zero build tools — just open and use.
| Feature | Detail |
|---|---|
| Single file | One .html file — no npm, no bundler, no server needed |
| Full arithmetic | Addition, subtraction, multiplication, division |
| Smart display | Auto-scales font size for long numbers |
| Chained operations | Seamless operator chaining (e.g. 5 + 3 × 2) |
| Edge case handling | Division-by-zero shows ERR:DIV0 |
| Keyboard support | Full numpad + keyboard input (see below) |
| Ripple effects | Click/tap feedback on every button |
| Flash on equals | Cyan glow flash when result is computed |
| Animated background | Scrolling perspective grid |
| Live ticker | Status bar at bottom |
- Download
calculator.html - Open it in any modern browser (Chrome, Firefox, Edge, Safari)
- That's it — no internet connection required after the Google Fonts load
| Key | Action |
|---|---|
0–9 |
Digit input |
. |
Decimal point |
+ |
Addition |
- |
Subtraction |
* |
Multiplication |
/ |
Division |
Enter or = |
Calculate result |
Escape |
Clear / AC |
Backspace |
Delete last digit |
% |
Percent |
| Token | Value | Purpose |
|---|---|---|
--glow |
#00f0ff |
Primary cyan accent |
--glow2 |
#ff2d78 |
Equals button / orb |
--bg |
#050a0f |
Page background |
--panel |
#0a1520 |
Calculator body |
--mono |
Share Tech Mono | Display & buttons |
--head |
Orbitron | Logo & result number |
Works in all modern browsers. Requires:
- CSS custom properties (variables)
- CSS Grid & Flexbox
- ES6 JavaScript
- Change accent color: Edit
--glowin:rootto any hex color - Change size: Edit
width: 360pxon.shell - Dark/Light toggle: Swap
--bgand--panelto lighter values - Remove grid animation: Delete the
body::beforerule and its@keyframes gridMove
calculator.html
├── <style> — all CSS (variables, animations, layout, button styles)
├── <body> — HTML structure (shell, display, keypad, ticker)
└── <script> — calculator logic (state machine, keyboard listeners)
Free to use, modify, and distribute. No attribution required.