Here’s a Temperature Converter built using HTML, CSS, and JavaScript. This simple app allows users to convert temperatures between Celsius (°C), Fahrenheit (°F), and Kelvin (K).
Features:
Convert temperature between Celsius, Fahrenheit, and Kelvin.
Real-time conversion as the user types
Simple, clean, and responsive UI
No external libraries pure HTML, CSS, and JavaScript
Full Code (HTML, CSS, JavaScript)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Temperature Converter</title>
<style>
body {
font-family: Arial, sans-serif;
background-color: #f4f4f4;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.container {
background: #fff;
padding: 20px;
border-radius: 10px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
text-align: center;
width: 320px;
}
h2 {
margin-bottom: 15px;
}
.input-group {
margin-bottom: 10px;
}
label {
font-weight: bold;
display: block;
}
input {
width: 100%;
padding: 8px;
margin-top: 5px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 16px;
text-align: center;
}
</style>
</head>
<body>
<div class="container">
<h2>Temperature Converter</h2>
<div class="input-group">
<label for="celsius">Celsius (°C)</label>
<input type="number" id="celsius" oninput="convertFromCelsius(this.value)">
</div>
<div class="input-group">
<label for="fahrenheit">Fahrenheit (°F)</label>
<input type="number" id="fahrenheit" oninput="convertFromFahrenheit(this.value)">
</div>
<div class="input-group">
<label for="kelvin">Kelvin (K)</label>
<input type="number" id="kelvin" oninput="convertFromKelvin(this.value)">
</div>
</div>
<script>
function convertFromCelsius(value) {
let celsius = parseFloat(value);
if (!isNaN(celsius)) {
document.getElementById('fahrenheit').value = (celsius * 9/5 + 32).toFixed(2);
document.getElementById('kelvin').value = (celsius + 273.15).toFixed(2);
} else {
clearFields();
}
}
function convertFromFahrenheit(value) {
let fahrenheit = parseFloat(value);
if (!isNaN(fahrenheit)) {
document.getElementById('celsius').value = ((fahrenheit - 32) * 5/9).toFixed(2);
document.getElementById('kelvin').value = ((fahrenheit - 32) * 5/9 + 273.15).toFixed(2);
} else {
clearFields();
}
}
function convertFromKelvin(value) {
let kelvin = parseFloat(value);
if (!isNaN(kelvin)) {
document.getElementById('celsius').value = (kelvin - 273.15).toFixed(2);
document.getElementById('fahrenheit').value = ((kelvin - 273.15) * 9/5 + 32).toFixed(2);
} else {
clearFields();
}
}
function clearFields() {
document.getElementById('celsius').value = "";
document.getElementById('fahrenheit').value = "";
document.getElementById('kelvin').value = "";
}
</script>
</body>
</html>
How It Works?
1. User enters a temperature in any field (Celsius, Fahrenheit, or Kelvin).
2. The script instantly converts and updates the other two fields.
3. Formulas Used for Conversion:
– Celsius to Fahrenheit: `(C × 9/5) + 32`
– Celsius to Kelvin: `C + 273.15`
– Fahrenheit to Celsius: `(F – 32) × 5/9`
– Fahrenheit to Kelvin: `((F – 32) × 5/9) + 273.15`
– Kelvin to Celsius: `K – 273.15`
– Kelvin to Fahrenheit: `((K – 273.15) × 9/5) + 32`
4. If the input is empty or invalid, the fields are cleared automatically.