To create a calculator with HTML, CSS, and JavaScript, you will need to create an HTML document that defines the structure and layout of the calculator using HTML elements, style the calculator using CSS, and create the calculator's functionality using JavaScript.

HTML: Create the structure of the calculator using HTML elements such as a “form” for the overall calculator, “div” elements for the calculator's display and buttons, and “input” elements for the buttons.

CSS: Style the calculator using CSS to give it a desired look and feel.

JavaScript: Use JavaScript to create the calculator's functionality such as handling button clicks, performing calculations, and updating the display.

Here is an example of how you might structure the HTML for a basic calculator:

This is just a basic example, you can add more functionality and improve the design as you see fit.