Best matchRelated: input valuesIntermediate
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Build a currency converter →Weight Converter
Build a weight converter with HTML, CSS, and JavaScript while practicing setTimeout and input events.
Intermediate30–45 minutesHTML5CSS3JavaScript
You’ll practice
setTimeoutInput EventsDOM Selection
01 — What you’ll build
Weight Converter
In this project, we’re going to build a weight converter using HTML, CSS, and JavaScript. You’ll see how to convert a value and keep the result easy to understand. Along the way, you’ll practice setTimeout, input events, and DOM selection, so you can understand how the interface and JavaScript logic work together.
02 — Included
- Real-time input feedback
- Weight Converter interface
- Responsive HTML and CSS layout
- Complete source code and live demo
03 — You’ll practice
- Delay actions with setTimeout
- Respond to input changes
- Select HTML elements from the DOM
- Update content on the page
- Read and update form values
- Format numbers with toFixed
Recommended knowledge: Basic HTML and CSS, JavaScript functions and callbacks, Browser timers, JavaScript variables and number operations.
Complete project files
Build It from the Source Code
This project uses timed JavaScript updates.
- 1Create 3 files
- 2Copy the code
- 3Run
index.html
Before you run it
- Leave the tab open to see the timed behavior update.
Project structure
weight-converter/
<!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>Weight Converter</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<h1 class="heading">Weight Converter</h1>
<div class="input-container">
<label for="pounds">Pounds:</label>
<input type="number" id="input" class="input" step=".1" placeholder="Enter number">
</div>
<p>Your weight in kg is: <span id="result"></span></p>
<p class="error" id="error"></p>
</div>
<script src="index.js"></script>
</body>
</html>
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