function calculateSalePrice() {
var originalPriceInput = document.getElementById("originalPrice");
var discountPercentageInput = document.getElementById("discountPercentage");
var originalPrice = parseFloat(originalPriceInput.value);
var discountPercentage = parseFloat(discountPercentageInput.value);
if (isNaN(originalPrice) || isNaN(discountPercentage) || originalPrice < 0 || discountPercentage < 0) {
document.getElementById("discountAmountResult").textContent = "Invalid Input";
document.getElementById("finalSalePriceResult").textContent = "Invalid Input";
return;
}
var discountAmount = originalPrice * (discountPercentage / 100);
var finalSalePrice = originalPrice – discountAmount;
document.getElementById("discountAmountResult").textContent = discountAmount.toFixed(2);
document.getElementById("finalSalePriceResult").textContent = finalSalePrice.toFixed(2);
}
// Run calculation on page load with default values
window.onload = calculateSalePrice;
Understanding the Sale Price Calculator
The Sale Price Calculator is a straightforward tool designed to help you determine the final cost of an item after a discount has been applied. Whether you're a shopper looking to verify a deal or a business owner setting promotional prices, understanding how to calculate a sale price is a fundamental skill.
What is a Sale Price?
A sale price is the reduced price of a product or service, typically offered for a limited time as part of a promotion or clearance event. It's the amount a customer pays after any discounts have been subtracted from the original, full price.
How Does the Calculator Work?
Our Sale Price Calculator uses a simple two-step process:
Calculate the Discount Amount: This is determined by multiplying the original price by the discount percentage (converted to a decimal).
Calculate the Final Sale Price: This is found by subtracting the calculated discount amount from the original price.
The Formula:
The core formulas used are:
Discount Amount = Original Price × (Discount Percentage / 100)
Final Sale Price = Original Price - Discount Amount
Example Scenarios:
Let's look at a few practical examples:
Example 1: A New Gadget
Imagine you want to buy a new smartphone that originally costs $799.00. A store is offering a 15% discount.