Overview: Upgrade your web project or browser experience with the Pro Expandable Scientific Calculator. Unlike standard calculators that look clunky and outdated, this tool features a premium “Slide-to-Expand” UI. It begins as a compact standard calculator for everyday math and smoothly expands sideways to reveal advanced scientific functions when needed.

Key Features:

• Dual-Mode UI: Starts as a 340px standard calculator; expands to 540px for scientific mode with a smooth CSS transition.

• Natural Expression Logic: Type complex formulas exactly as you would write them on paper (e.g., sin(30) + log(100)).

• Smart Math Engine:

  • Auto-converts degrees to radians for Trigonometry.

  • Handles π and e constants.

  • Supports parenthesis ( ) nesting for complex order of operations.

  • includes precision fixing to avoid common JS float errors (e.g., 0.1 + 0.2).

• Horizontal Scrolling Display: Never lose track of your long equations; the screen scrolls automatically as you type.

• 100% Pure Code: Built with vanilla HTML, CSS, and JavaScript. No Bootstrap, jQuery, or React dependencies required.

What’s Included:

• Source Code (index.html, style.css, script.js)

Perfect For:

• Student & Educational Portals

• Financial & Mortgage Dashboards