I built a simple interest calculator as a small side project to practice handling user inputs and calculation logic using vanilla JavaScript.
The goal was to keep it clean, simple, and easy to use.
Features
- Calculates simple interest instantly
- Clean and minimal UI
- Responsive layout for mobile
- Built using HTML, CSS, and vanilla JS
Why I built it
Many interest calculators online try to do too much at once.
I wanted a focused tool that:
- Does one thing well
- Is easy to understand
- Can be reused in small projects
Implementation overview
- HTML for form inputs and structure
- CSS for spacing, layout, and responsiveness
- JavaScript for:
- Interest calculation logic
- Input validation
- Real-time result updates
No formulas. No math lecture.
Live demo & source code
Live demo: (https://yuvronixstudio.github.io/interest-calculator/)
Source code: (https://github.com/YuvronixStudio/interest-calculator/)
What I learned
- Simpler tools are easier to test and improve
- Clear input labels reduce user errors
- Small projects are great for sharpening fundamentals
I’m continuing to build small, practical web tools
and share what I learn along the way.
Feedback or suggestions are welcome.
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