Discount Calculator
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f8f9fa;
color: #333;
line-height: 1.6;
margin: 0;
padding: 20px;
}
.discount-calc-container {
max-width: 700px;
margin: 30px auto;
background-color: #ffffff;
padding: 30px;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}
h1, h2 {
color: #004a99;
text-align: center;
margin-bottom: 20px;
}
.input-group {
margin-bottom: 20px;
display: flex;
flex-wrap: wrap;
align-items: center;
}
.input-group label {
flex: 1 1 150px; /* Grow, shrink, basis */
min-width: 120px; /* Minimum width for label */
margin-right: 15px;
font-weight: 500;
color: #555;
}
.input-group input {
flex: 2 1 200px; /* Grow, shrink, basis */
padding: 10px 15px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1rem;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.input-group input[type="number"] {
text-align: right;
}
button {
display: block;
width: 100%;
padding: 12px 20px;
background-color: #004a99;
color: white;
border: none;
border-radius: 5px;
font-size: 1.1rem;
cursor: pointer;
transition: background-color 0.3s ease;
margin-top: 10px;
}
button:hover {
background-color: #003366;
}
#result {
margin-top: 30px;
padding: 20px;
background-color: #e9ecef;
border: 1px solid #dee2e6;
border-radius: 5px;
text-align: center;
}
#result h3 {
margin-top: 0;
color: #004a99;
}
#discountAmount, #finalPrice {
font-size: 1.5rem;
font-weight: bold;
color: #28a745;
}
#discountPercentageDisplay {
font-size: 1.1rem;
font-weight: bold;
color: #004a99;
}
.article-section {
margin-top: 40px;
padding-top: 20px;
border-top: 1px solid #eee;
}
.article-section h2 {
text-align: left;
margin-bottom: 15px;
}
.article-section p, .article-section ul {
margin-bottom: 15px;
}
.article-section li {
margin-bottom: 8px;
}
/* Responsive adjustments */
@media (max-width: 600px) {
.input-group {
flex-direction: column;
align-items: stretch;
}
.input-group label {
margin-right: 0;
margin-bottom: 8px;
}
.input-group input {
width: 100%;
flex: none;
}
.discount-calc-container {
padding: 20px;
}
}
Discount Calculator
Original Price ($)
Discount Percentage (%)
Calculate Discount
Calculation Results
Discount Amount: $0.00
Final Price: $0.00
You saved
Understanding and Calculating Discounts
Discounts are a common strategy used in retail and business to attract customers, clear inventory, or boost sales.
Understanding how to calculate discounts accurately is beneficial for both consumers and businesses.
Whether you're looking to see how much you're saving on a purchase or planning a promotional sale, this calculator and explanation will help.
How Discounts Work
A discount is a reduction in the usual cost of something. It's typically expressed as a percentage of the original price or as a fixed amount.
The most common type of discount is a percentage discount, which is what our calculator focuses on.
The Math Behind the Discount Calculator
To calculate a discount, you need two key pieces of information:
Original Price: The initial price of the item before any reduction.Discount Percentage: The rate of reduction, expressed as a percentage (e.g., 10%, 25%).
The calculation involves two main steps:
Calculate the Discount Amount:
To find out how much money is being discounted, you multiply the original price by the discount percentage (converted to a decimal).
Formula: Discount Amount = Original Price × (Discount Percentage / 100)
Calculate the Final Price:
To find the price you will actually pay, subtract the discount amount from the original price.
Formula: Final Price = Original Price – Discount Amount
Example Calculation
Let's say you want to buy a laptop that originally costs $1200 and is on sale with a 20% discount .
Step 1: Calculate Discount Amount
Discount Amount = $1200 × (20 / 100) = $1200 × 0.20 = $240
Step 2: Calculate Final Price
Final Price = $1200 – $240 = $960
So, you save $240, and the final price you pay for the laptop is $960.
Use Cases for a Discount Calculator
This calculator is useful for:
Shoppers: Quickly determine the exact savings and final price on sale items.Retailers: Plan promotional sales, set accurate discounts, and inform customers clearly.Budgeting: Estimate costs for purchases during sales events.
function calculateDiscount() {
var originalPriceInput = document.getElementById("originalPrice");
var discountRateInput = document.getElementById("discountRate");
var discountAmountSpan = document.getElementById("discountAmount");
var finalPriceSpan = document.getElementById("finalPrice");
var discountPercentageDisplay = document.getElementById("discountPercentageDisplay");
var savedAmountSpan = document.getElementById("savedAmount");
var originalPrice = parseFloat(originalPriceInput.value);
var discountRate = parseFloat(discountRateInput.value);
// Input validation
if (isNaN(originalPrice) || originalPrice < 0) {
alert("Please enter a valid original price (a non-negative number).");
originalPriceInput.value = ""; // Clear invalid input
return;
}
if (isNaN(discountRate) || discountRate 100) {
alert("Please enter a valid discount percentage between 0 and 100.");
discountRateInput.value = ""; // Clear invalid input
return;
}
// Calculations
var discountAmount = originalPrice * (discountRate / 100);
var finalPrice = originalPrice – discountAmount;
// Display results, formatted to two decimal places
discountAmountSpan.textContent = "$" + discountAmount.toFixed(2);
finalPriceSpan.textContent = "$" + finalPrice.toFixed(2);
// Show the saved percentage display if there's a discount
if (discountRate > 0) {
discountPercentageDisplay.style.display = "block";
savedAmountSpan.textContent = discountRate.toFixed(0); // Display whole percentage saved
} else {
discountPercentageDisplay.style.display = "none";
}
}