Best matchRelated: input valuesBeginner
BMI Calculator
Read form values and use them in the project logic.
Build a bmi calculator →Basic Calculator
Build a basic calculator with HTML, CSS, and JavaScript while practicing click events and DOM selection.
Beginner20–30 minutesHTML5CSS3JavaScript
You’ll practice
Click EventsDOM SelectionDOM Content Updates
01 — What you’ll build
Basic Calculator
This project shows you how HTML, CSS, and JavaScript work together in a basic calculator. You’ll take user input, perform a calculation, and display a clear result, then practice click events, DOM selection, and DOM content updates as you build the complete project from scratch.
02 — Included
- Click-based interactions
- Basic Calculator interface
- Responsive HTML and CSS layout
- Complete source code and live demo
03 — You’ll practice
- Handle user clicks
- Select HTML elements from the DOM
- Update content on the page
- Read and update form values
- Control behavior with conditions
- Perform calculations with JavaScript
Recommended knowledge: Basic HTML and CSS, JavaScript variables and number operations, DOM selection and form events, DOM selection and click events.
Complete project files
Build It from the Source Code
This project runs directly in the browser with HTML, CSS, and JavaScript.
- 1Create 3 files
- 2Copy the code
- 3Run
index.html
Before you run it
- Keep all project files together in the same folder.
Project structure
basic-calculator/
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Basic Calculator</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="calculator">
<input type="text" id="result" readonly>
<div class="buttons">
<button class="clear">C</button>
<button class="operator">/</button>
<button class="operator">*</button>
<button class="operator">-</button>
<button class="number">7</button>
<button class="number">8</button>
<button class="number">9</button>
<button class="operator">+</button>
<button class="number">4</button>
<button class="number">5</button>
<button class="number">6</button>
<button class="equals">=</button>
<button class="number">1</button>
<button class="number">2</button>
<button class="number">3</button>
<button class="number">0</button>
<button class="decimal">.</button>
</div>
</div>
<script src="index.js"></script>
</body>
</html>
JS Related Projects
Practice with Related Projects
Practice input values, javaScript calculations, and conditional logic with these related projects.
Best match
Related: JavaScript calculations
Age Calculator
Turn JavaScript calculations into clear visual results.
Build an age calculator →
Related: conditional logic
Number Counter
Use conditions to control how the interface behaves.
Build a number counter →Related: input valuesBest match
BMI Calculator
Read form values and use them in the project logic.
Build a bmi calculatorRelated: JavaScript calculations
Age Calculator
Turn JavaScript calculations into clear visual results.
More challenging
Build an age calculatorRelated: conditional logic
Number Counter
Use conditions to control how the interface behaves.
More challenging
Build a number counter