Build a Simple Calculator using HTML, CSS & JavaScript (Beginner Project)
⚡ Build a Simple Calculator using HTML, CSS & JavaScript (Beginner Project)
Hello everyone 👋
Welcome back!
In this project, we will build a simple calculator using HTML, CSS, and JavaScript. This is perfect for beginners to understand logic and DOM manipulation 💻
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🌟 What You Will Learn
- HTML structure
- CSS styling
- JavaScript logic
- Event handling
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🧱 Step 1: HTML Code
<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
</head>
<body>
<div class="calculator">
<input type="text" id="result" disabled>
<button onclick="clearResult()">C</button>
<button onclick="deleteLast()">DEL</button>
<button onclick="appendValue('/')">/</button>
<button onclick="appendValue('7')">7</button>
<button onclick="appendValue('8')">8</button>
<button onclick="appendValue('9')">9</button>
<button onclick="appendValue('*')">*</button>
<button onclick="appendValue('4')">4</button>
<button onclick="appendValue('5')">5</button>
<button onclick="appendValue('6')">6</button>
<button onclick="appendValue('-')">-</button>
<button onclick="appendValue('1')">1</button>
<button onclick="appendValue('2')">2</button>
<button onclick="appendValue('3')">3</button>
<button onclick="appendValue('+')">+</button>
<button onclick="appendValue('0')">0</button>
<button onclick="calculate()">=</button>
</div>
<script src="script.js"></script>
</body>
</html>
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🎨 Step 2: CSS Code
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background: #222;
}
.calculator {
background: #333;
padding: 20px;
border-radius: 10px;
}
input {
width: 100%;
height: 40px;
margin-bottom: 10px;
text-align: right;
}
button {
width: 50px;
height: 50px;
margin: 5px;
}
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⚡ Step 3: JavaScript Code
let result = document.getElementById("result");
function appendValue(value) {
result.value += value;
}
function clearResult() {
result.value = "";
}
function deleteLast() {
result.value = result.value.slice(0, -1);
}
function calculate() {
try {
result.value = eval(result.value);
} catch {
result.value = "Error";
}
}
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🎯 Output
👉 A working calculator that can:
- Add ➕
- Subtract ➖
- Multiply ✖
- Divide ➗
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⭐ Tips
- Don’t just copy—understand logic
- Try adding new features
- Change design
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📌 Conclusion
This was a simple calculator project using JavaScript.
Perfect for beginners to build real coding skills 🚀
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📢 Also Read
- JavaScript Interview Questions
- Python Programs
- Web Development Basics
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👉 Follow for more coding projects 💻
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