Welcome to the Sales Tax Calculator, a modern and intuitive web application designed to simplify your financial calculations. Built with pure HTML, CSS, and JavaScript, this tool provides a seamless experience for quickly determining the tax on any purchase. Whether you're shopping online, managing business expenses, or planning a budget, this calculator offers accurate, real-time computations with a clean and responsive interface that works perfectly on any device.

This application goes beyond basic arithmetic by offering interactive features like visual tax breakdowns, preset tax rates, and a persistent calculation history. With its user-friendly design and powerful functionality, the Sales Tax Calculator transforms a routine task into an efficient and visually engaging process, helping you make informed financial decisions with ease and confidence.

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Key Features:

• Real-time Calculation. Instant tax computation as users enter values or adjust sliders.

• Interactive Tax Rate Control. Visual slider with percentage and dollar amount display for precise tax rate adjustments.

• Quick Tax Presets. One-click selection of common tax rates, including tax-free, low, standard, high, and luxury rates.

• Visual Breakdown Chart. Graphical representation showing the proportion of tax versus subtotal using color-coded bars.

• Calculation History. Automatic saving of previous calculations with click-to-reload functionality.

• Location Tagging. Optional location field to organize and identify calculations by geographic area.

• Responsive Design. Fully adaptive layout that works seamlessly on mobile, tablet, and desktop devices.

• Persistent Storage. Calculation history is preserved between browser sessions using localStorage.

• Keyboard Shortcuts. Productivity shortcuts including Ctrl/Cmd + Enter to calculate and Escape to reset.

• Modern UI Elements. Clean interface with hover effects, smooth transitions, and intuitive visual feedback.

Technologies Used:

• HTML5 – Semantic markup for structured and accessible content

• CSS3 – Modern styling using Grid, Flexbox, custom properties, and responsive techniques

• Vanilla JavaScript – Pure JavaScript for all interactive functionality

• Font Awesome – Icon set for visual cues and interface elements

• Google Fonts – Inter font family for modern, clean typography

• LocalStorage API – Client-side storage for saving calculation history

• Intl.NumberFormat API – Built-in JavaScript API for accurate currency formatting

How to Use:

1. Enter the purchase amount in dollars using the input field or adjust the default value.

2. Set the tax rate using the interactive slider or select one of the preset tax buttons.

3. (Optional) Add a location name to tag the calculation for future reference.

4. Click Calculate Tax or press Ctrl/Cmd + Enter to compute the tax.

5. Review the detailed breakdown showing subtotal, tax rate, tax amount, and total.

6. View the visual chart illustrating the proportion between subtotal and tax.

7. Access previous calculations by clicking any item in the history section.

8. Click Reset or press Escape to clear inputs and restore default values.

9. Review your automatically saved calculation history (up to the last 10 entries).

Sample Screenshots of the Project

Landing Page

Sample Calculation

How to Run?

• Download the provided source code zip file.
• Extract the downloaded zip file.
• Open the html file and you are now ready to go!

Video Demonstration for Installation/Setup:

Conclusion:

In conclusion, the Sales Tax Calculator demonstrates how modern web technologies can transform everyday tasks into efficient, engaging experiences, providing users with not just accurate calculations but also valuable insights through visualizations and historical tracking—all within a single, self-contained application that marries functionality with elegant design.

That's it! I hope this "Sales Tax Calculator Using HTML, CSS and JavaScript" will assist you on your  programming journey, providing value to your current and upcoming project.

For additional tutorials and free source codes, explore our website.

Enjoy Coding :>>