Tip Calculator Using JavaScript

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Introduction of the Project

A tip calculator is a useful tool for quickly determining the appropriate amount to tip at a restaurant or for any other service. In this tutorial, we will be creating a simple tip calculator using JavaScript. This tip calculator will allow the user to enter the bill amount and tip percentage and will then calculate and display the tip amount and total bill (including tip).

This tutorial will cover the basics of JavaScript, including variables, prompt and alert boxes, and mathematical operations. By the end of this tutorial, you will have a solid understanding of how to create a tip calculator using JavaScript and will be able to customize it to suit your own needs. We will use HTML and CSS to build the GUI to make the project more interesting.



The objectives for creating Tip Calculator Using JavaScript are as follows:

  • To create a simple tip calculator that can be used to determine the tip amount and total bill value by using the bill value and percentage value.
  • To understand the basics of JavaScript and how it can be used to create interactive web applications.
  • To learn how to use variables, prompt and alert boxes, and mathematical operations in JavaScript.
  • To learn how to validate user input and provide feedback to the user in case of errors.
  • To understand how to format and display the output in a user-friendly way.
  • To learn how to customize the tip calculator to suit different needs and preferences.
  • To learn how to add additional functionality such as rounding or displaying the tip in different currencies.
  • To gain experience in problem-solving and thinking critically about how to develop a functional and user-friendly application.


  • Basic understanding of HTML and CSS, as the tip calculator will be implemented as a webpage.
  • Text editor, such as Notepad++ or Sublime Text, to write the JavaScript code.
  • Web browser, such as Chrome, Firefox, or Safari, to test the tip calculator.
  • Some basic knowledge of variables, loops, and functions in JavaScript would be helpful but not mandatory.

JavaScript is the programming language, we use HTML to structure the site, and we use CSS to design and layout the webpage.

Source Code


<!DOCTYPE html>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>Tip Calculator</title>
<label for="name"><b>ENTER AMOUNT</b></label><br>
<input type="text" id="amt" ><br>
<label for="number"><b>TIP PERCENTAGE</b></label><br>
<input type="text" id="perc" ><br>
<label for="email"><b>TIP AMOUNT</b></label>
<label for=""><b id="amount"></b></label>
<label for="pwd"><b>TOTAL BILL</b></label>
<label for="" ><b id="bill" ></b></label>
<button onclick="tipCalc()" class="tipbutton">CALCULATE TIP</button>
<script src="tip.js"></script>

CSS Code

font-family: Arial, Helvetica, sans-serif;
border: 1px solid #000000;
margin-bottom: 5px;
padding: 0px 15px 0 15px;
input[type=text], input[type=password]
width: 50%;
padding: 10px;
margin: 5px 0 22px 0;
display: inline-block;
border: none;
background: #F5F5F5;
border: 1px solid #e6e6e6;
margin-bottom: 15px;
background-color: #29a329;
color: white;
padding: 15px 20px;
margin: 10px 0px;
border: none;
cursor: pointer;
width: 50%;


function tipCalc(){
let tipAmount = document.getElementById("amt").value;
let tipPerc = document.getElementById("perc").value;
let tip = (tipAmount*tipPerc)/100;
let total = Number(tipAmount)+tip;
document.getElementById("amount").innerHTML = tip;
document.getElementById("bill").innerHTML = total;

Explanation of the Code

We have broken the code in three sections. First is HTML to make the basic structure of website. Next is to style the website using CSS, and last is calculating the tip with the entered bill amount and tip percentage using JavaScript.

1. It consists of 2 input fields with labels on them.

2. It consists of 2 Labels that denote the tip amount & total bill, respectively.

3. It has a button that calculates the tip.

4. The CSS file is meant for styling the HTML, where the container is provided with appropriate margin, padding, and font color, and font size.

Moving to the tip calculation process, we will apply the following:

1. It uses the amount entered and percentage data in the formula [Tip = (Entered Amount*Tip Percentage)/100] to calculate the Tip amount.

2. It stores the entered amount in a variable to be added to the tip amount to calculate the total amount needed to pay.


The main interface of this Java project will look like:

Tip Calculator Using JavaScript


We have successfully created a simple tip calculator using JavaScript. It extracts the amount and percentage data from the user & returns the tip amount and total amount to the user. It has a very user-friendly interface that makes it very easy to enter the bill value and have the total amount ready.


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