Build a Tip Calculator in Vanilla JavaScript: a beginner DOM project

A tip calculator is a great first DOM project. It requires user input, real-time calculation, and clean output — but no API calls, no data storage, no complexity you don't control. By the end of this post you'll have a working tip calculator that handles bill splitting too. The math Before writing any code, get the arithmetic right: tip amount = bill × (tip% / 100) total = bill + tip amount per person = total / number of people That's it. The calculator is just this formula wired to input fields