Build a JavaScript BMI Calculator (Step-by-Step Beginner Guide)

Most beginners try to build complex apps too early. That’s where they get stuck. If you actually want to learn JavaScript, start with small, useful tools. One of the best beginner projects is a BMI (Body Mass Index) calculator. It teaches you: How to take user input How to perform calculations How to update the UI using JavaScript Let’s build one from scratch. Final Output (What We’re Building) We’ll create a simple app where: user enters weight (kg) user enters height (meters) clicks a button sees their BMI instantly 👉 (https://yuvronixstudio.github.io/simple-bmi-calculator/) Step 1: HTML Structure Start with a basic layout. Step 2: Basic Styling (CSS) Keep it simple and clean. Step 3: JavaScript Logic Now the important part. Why We Used parseFloat() HTML inputs always return values as strings. If you don’t convert them: You may get incorrect results in calculations. That’s why we use: Bonus: Improve UX (Optional) You can enhance your calculator by: showing BMI categories (Underweigh