Tip Calculator JavaScript Code

This code provides a user-friendly web-based tip calculator. It calculates the tip amount based on the bill amount, service quality, and the number of people sharing the bill. The core functionality lies in the “calculateTip()” method, which computes the tip and displays it. It’s helpful for quickly determining the appropriate tip amount in various dining situations.

This calculator simplifies the process of calculating tips. It can be integrated into various contexts, including restaurant websites, food delivery apps, and hospitality websites. Moreover, the design of the calculator widget can be customized with custom CSS according to your website/app template.

How to Create Tip Calculator with JavaScript Code

1. Copy the following HTML code and paste it into your HTML document where you want the tip calculator to appear.

<div id="container">
  <h1>Tip Calculator</h1>
  <div id="calculator">
    <form>
      <p>How much was your bill?
        <p>
          $ <input id="billamt" type="text" placeholder="Bill Amount">

          <p>How was your service?
            <p>
              <select id="serviceQual">
            <option disabled selected value="0">-- Choose an Option --</option>
            <option value="0.3">30&#37; &#45; Outstanding</option>
            <option value="0.2">20&#37; &#45; Good</option>
            <option value="0.15">15&#37; &#45; It was OK</option>
            <option value="0.1">10&#37; &#45; Bad</option>
            <option value="0.05">5&#37; &#45; Terrible</option>
        </select>

    </form>
    <p>How many people are sharing the bill?</p>
    <input id="peopleamt" type="text" placeholder="Number of People"> people
    <button type="button" id="calculate">Calculate!</button>

  </div>
  <!--calculator end-->
  <div id="totalTip">
    <sup>$</sup><span id="tip">0.00</span>
    <small id="each">each</small>
  </div>
  <!--totalTip end-->

</div>

2. Now, add the following CSS code to style the calculator. You can apply custom CSS styles to the HTML elements to match the calculator’s appearance to your website’s design.

body {
  font-family: Roboto;
  background: #8E0E00;
  /* fallback for old browsers */
  background: -webkit-linear-gradient(to left, #8E0E00, #1F1C18);
  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to left, #8E0E00, #1F1C18);
  /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

#container {
  height: 525px;
  width: 360px;
  margin: 100px auto;
  background: #f7f7f7;
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
  border-radius: 20px;
  -webkit-border-radius: 20px;
  -moz-border-radius: 20px;
}

#container h1 {
  background: #1F030C;
  color: white;
  margin: 0;
  padding: 10px 100px;
  text-transform: uppercase;
  font-size: 18px;
  font-weight: normal;
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
}

p {
  padding-left: 20px;
}

form input[type="text"] {
  width=90px;
}

input {
  padding-left: 20px;
}

#billamt {
  font-size: 14px;
  /*color: #2980b9;*/
  color: #red;
  background-color: #f7f7f7;
  width: 60%;
  padding: 5px 5px 8px 8px;
}

#billamt:focus {
  background: #fff;
  border: 3px solid #2980b9;
  outline: none;
}

#peopleamt {
  width: 60%;
  padding: 5px 5px 8px 8px;
  margin-left: 20px;
  color: #red;
  background-color: #f7f7f7;
  font-size: 14px;
}

.dollarSign {
  display: inline;
}

#serviceQual {
  padding: 13px 13px 20px 20px;
  margin-left: 20px;
  font-size: 25px;
}

button {
  text-transform: uppercase;
  font-weight: bold;
  display: block;
  margin: 30px auto;
  background: #AD133A;
  border-radius: 5px;
  width: 200px;
  height: 50px;
  font-size: 17px;
  color: white;
}

button:hover {
  background: #4c2827;
  border-bottom-color: #111;
}

button:active {
  position: relative;
  top: 1px;
}

#totalTip {
  font-size: 30px;
  margin-top: 5px;
  text-align: center;
}

#totalTip:before {
  content: "Tip amount";
  font-size: 20px;
  font-weight: bold;
  display: block;
  text-transform: uppercase;
}

#totalTip sup {
  font-size: 20px;
  top: -18px;
}

#totalTip small {
  font-size: 20px;
  font-weight: bold;
  display: block;
}

3. Copy the following JavaScript code and place it within a <script> tag in your HTML document, typically within the <head> or at the end of the <body> section.

//Calculate Tip
function calculateTip() {
  var billAmt = document.getElementById("billamt").value;
  var serviceQual = document.getElementById("serviceQual").value;
  var numOfPeople = document.getElementById("peopleamt").value;

  //validate input
  if (billAmt === "" || serviceQual == 0) {
    alert("Please enter values");
    return;
  }
  //Check to see if this input is empty or less than or equal to 1
  if (numOfPeople === "" || numOfPeople <= 1) {
    numOfPeople = 1;
    document.getElementById("each").style.display = "none";
  } else {
    document.getElementById("each").style.display = "block";
  }

  //Calculate tip
  var total = (billAmt * serviceQual) / numOfPeople;
  //round to two decimal places
  total = Math.round(total * 100) / 100;
  //next line allows us to always have two digits after decimal point
  total = total.toFixed(2);
  //Display the tip
  document.getElementById("totalTip").style.display = "block";
  document.getElementById("tip").innerHTML = total;

}

//Hide the tip amount on load
document.getElementById("totalTip").style.display = "none";
document.getElementById("each").style.display = "none";

//click to call function
document.getElementById("calculate").onclick = function() {
  calculateTip();

};

That’s all! hopefully, you have successfully created the Tip Calculator Javascript Code. If you have any questions or suggestions, feel free to comment below.

Asif Mughal

I code and create web elements for amazing people around the world. I like work with new people. New people new Experiences.
I truly enjoy what I’m doing, which makes me more passionate about web development and coding. I am always ready to do challenging tasks whether it is about creating a custom CMS from scratch or customizing an existing system.