How to Calculate Discount

Discount Calculator

function calculateDiscount() { var originalPriceInput = document.getElementById("originalPrice").value; var discountPercentageInput = document.getElementById("discountPercentage").value; var originalPrice = parseFloat(originalPriceInput); var discountPercentage = parseFloat(discountPercentageInput); if (isNaN(originalPrice) || originalPrice < 0) { document.getElementById("discountedPriceResult").textContent = "Please enter a valid original price."; document.getElementById("amountSavedResult").textContent = ""; return; } if (isNaN(discountPercentage) || discountPercentage 100) { document.getElementById("discountedPriceResult").textContent = "Please enter a valid discount percentage (0-100)."; document.getElementById("amountSavedResult").textContent = ""; return; } var amountSaved = originalPrice * (discountPercentage / 100); var discountedPrice = originalPrice – amountSaved; document.getElementById("discountedPriceResult").textContent = "$" + discountedPrice.toFixed(2); document.getElementById("amountSavedResult").textContent = "$" + amountSaved.toFixed(2); }

Understanding and Calculating Discounts

Discounts are a common part of everyday shopping, offering a reduction in the original price of a product or service. Whether you're a consumer looking for a good deal or a business owner setting promotional prices, understanding how to calculate discounts is a fundamental skill. This guide and calculator will help you quickly determine savings and final prices.

What is a Discount?

A discount is a deduction from the usual cost of something, typically given for prompt payment or to a particular category of buyer. It's usually expressed as a percentage off the original price. For example, "20% off" means you pay 20% less than the item's standard price.

How to Calculate a Discount

Calculating a discount involves two main steps: first, finding the amount of the discount, and second, subtracting that amount from the original price to get the final discounted price.

Step 1: Calculate the Discount Amount

To find out how much money you save, you multiply the original price by the discount percentage (expressed as a decimal).

Formula: Discount Amount = Original Price × (Discount Percentage / 100)

Step 2: Calculate the Discounted Price

Once you have the discount amount, subtract it from the original price to get the final price you'll pay.

Formula: Discounted Price = Original Price – Discount Amount

Practical Examples

Let's walk through a couple of examples to solidify your understanding:

Example 1: A Shirt on Sale

• Original Price: $50.00
• Discount Percentage: 20%

Discount Amount = $50.00 × (20 / 100) = $50.00 × 0.20 = $10.00
Discounted Price = $50.00 – $10.00 = $40.00

You save $10.00, and the shirt costs $40.00.

Example 2: A New Gadget

• Original Price: $299.99
• Discount Percentage: 15%

Discount Amount = $299.99 × (15 / 100) = $299.99 × 0.15 = $44.9985 (round to $45.00)
Discounted Price = $299.99 – $45.00 = $254.99

You save approximately $45.00, and the gadget costs $254.99.

Using the Discount Calculator

Our easy-to-use Discount Calculator above simplifies this process. Simply enter the "Original Price" of the item and the "Discount Percentage" being offered. Click "Calculate Discount," and the tool will instantly display both the "Discounted Price" (what you'll pay) and the "Amount Saved" (how much you're saving).

This calculator is perfect for quickly checking sale prices, comparing deals, or planning your budget for discounted purchases.