JavaScript: Calculate the volume of a sphere

Last update on July 18 2025 12:59:15 (UTC/GMT +8 hours)

JavaScript DOM: Exercise-10 with Solution

Sphere Volume Calculator

Write a JavaScript program to calculate sphere volume.

Sample Output of the form :

volume sphere html form

Sample Solution:

HTML Code:

<!-- Declaration of HTML document type -->
<!doctype html>
<!-- Start of HTML document -->
<html lang="en">
<head>
<!-- Declaring character encoding -->
<meta charset="utf-8">
<!-- Setting title of the document -->
<title>Volume of a Sphere</title>
<!-- Internal CSS styling -->
<style> 
    /* Styling body to have padding at the top */
    body{padding-top:30px;}
    /* Styling label and input elements to display as block */
    label,input{display:block;} 
</style>
</head>
<!-- Start of body section -->
<body>
<!-- Paragraph explaining the purpose of the form -->
<p>Input radius value and get the volume of a sphere.</p>
<!-- Form for inputting radius and displaying volume -->
<form action="" method="post" id="MyForm">
    <!-- Label and input field for entering radius -->
    <label for="radius">Radius</label><input type="text" name="radius" id="radius" required>
    <!-- Label and input field for displaying volume -->
    <label for="volume">Volume</label><input type="text" name="volume" id="volume">
    <!-- Submit button for calculating volume -->
    <input type="submit" value="Calculate" id="submit">
</form>
<!-- End of body section -->
</body>
<!-- End of HTML document -->
</html>

JavaScript Code:

// Function declaration for volume_sphere
function volume_sphere()
 {
  // Variable to hold the volume
  var volume;
  // Getting the radius value from the input field
  var radius = document.getElementById('radius').value;
  // Taking absolute value of radius to ensure it's positive
  radius = Math.abs(radius);
  // Calculating the volume of the sphere
  volume = (4/3) * Math.PI * Math.pow(radius, 3);
  // Rounding the volume to 4 decimal places
  volume = volume.toFixed(4);
  // Setting the calculated volume in the volume input field
  document.getElementById('volume').value = volume;
  // Returning false to prevent form submission
  return false;
 } 
// Attaching volume_sphere function to window.onload and form submit event
window.onload = document.getElementById('MyForm').onsubmit = volume_sphere;

Output:

Flowchart:

Live Demo:

See the Pen javascript-dom-exercise-10 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

Write a JavaScript function that calculates the volume of a sphere using user-provided input for the radius.
Write a JavaScript function that validates the input radius to ensure it is a positive number before calculating the sphere volume.
Write a JavaScript function that converts the calculated sphere volume to a string formatted to two decimal places.
Write a JavaScript function that dynamically updates a result div with the sphere's volume when a form is submitted.

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