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Build an Age Calculator with HTML, CSS & JavaScript

1.7K views
Nov 13, 2025
40:59

Build an Age Calculator with HTML, CSS & JavaScript In this comprehensive tutorial, we are building a fully functional and stylish Age Calculator from the ground up using HTML, CSS, and JavaScript. You will learn how to create a clean, modern web application that allows users to input their birth date and instantly receive their exact age. We'll start by structuring our project with semantic HTML, then move on to styling it with CSS to achieve a centered container with a soft shadow, rounded corners, and interactive button effects. Finally, we'll bring the calculator to life with JavaScript, handling date input, performing accurate age calculations that account for the current month and day, and dynamically displaying the result on the page. Throughout this step-by-step guide, you will gain practical experience with core web development concepts. We'll cover essential topics like setting up a project folder in Visual Studio Code, linking external CSS and JavaScript files, and using event listeners to make the application interactive. You'll also learn important JavaScript logic for working with the Date object, comparing dates, and conditionally updating the displayed text to ensure grammatical correctness. This project is perfect for beginners looking to solidify their understanding of how HTML, CSS, and JavaScript work together to create a dynamic user experience. By the end of this video, you will have a complete, portfolio-ready project and a deeper understanding of front-end development. This tutorial is designed to be easy to follow, with clear explanations for every line of code. If you find this guide helpful, please consider supporting the channel by leaving a like and subscribing for more web development tutorials. Let me know in the comments what other projects you would like to build in future videos! Source Code: https://www.100jsprojects.com/project/age-calculator #JavaScript #WebDevelopment #CodingForBeginners timestamp: 0:00 - Preview - Age Calculator 1:22 - HTML - Age Calculator 10:07 - CSS - Age Calculator 22:53 - JavaScript - Age Calculator

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Build an Age Calculator with HTML, CSS & JavaScript | NatokHD