Sale Calculator

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Sale Price Calculator

Calculation Results:

Discount Amount: $0.00

Price After Discount: $0.00

Sales Tax Amount: $0.00

Final Price: $0.00

function calculateSalePrice() { var originalPrice = parseFloat(document.getElementById('originalPrice').value); var discountPercentage = parseFloat(document.getElementById('discountPercentage').value); var salesTaxPercentage = parseFloat(document.getElementById('salesTaxPercentage').value); var resultDiv = document.getElementById('saleResult'); var discountAmountDisplay = document.getElementById('discountAmountDisplay'); var priceAfterDiscountDisplay = document.getElementById('priceAfterDiscountDisplay'); var salesTaxAmountDisplay = document.getElementById('salesTaxAmountDisplay'); var finalPriceDisplay = document.getElementById('finalPriceDisplay'); if (isNaN(originalPrice) || isNaN(discountPercentage) || isNaN(salesTaxPercentage)) { resultDiv.innerHTML = '

Error: Please enter valid numbers for all fields.

'; return; } if (originalPrice < 0) { resultDiv.innerHTML = '

Error: Original Item Price cannot be negative.

'; return; } if (discountPercentage 100) { resultDiv.innerHTML = '

Error: Discount Percentage must be between 0 and 100.

'; return; } if (salesTaxPercentage < 0) { resultDiv.innerHTML = '

Error: Sales Tax Percentage cannot be negative.

'; return; } var discountAmount = originalPrice * (discountPercentage / 100); var priceAfterDiscount = originalPrice – discountAmount; var salesTaxAmount = priceAfterDiscount * (salesTaxPercentage / 100); var finalPrice = priceAfterDiscount + salesTaxAmount; discountAmountDisplay.innerHTML = 'Discount Amount: $' + discountAmount.toFixed(2); priceAfterDiscountDisplay.innerHTML = 'Price After Discount: $' + priceAfterDiscount.toFixed(2); salesTaxAmountDisplay.innerHTML = 'Sales Tax Amount: $' + salesTaxAmount.toFixed(2); finalPriceDisplay.innerHTML = 'Final Price: $' + finalPrice.toFixed(2); }

Understanding the Sale Price Calculator

Whether you're a shopper looking for a great deal or a business owner setting prices, understanding how discounts and sales tax affect the final cost of an item is crucial. Our Sale Price Calculator simplifies this process, allowing you to quickly determine the true cost of a product after all reductions and additions.

How Sale Prices Are Calculated

The calculation of a sale price involves a few straightforward steps:

  1. Original Price: This is the starting price of the item before any discounts are applied.
  2. Discount Percentage: This is the percentage by which the original price is reduced. For example, a 20% discount means you save 20% of the original price.
  3. Discount Amount: This is the actual monetary value of the discount. It's calculated by multiplying the Original Price by the Discount Percentage (converted to a decimal).
    Formula: Discount Amount = Original Price × (Discount Percentage / 100)
  4. Price After Discount: This is the price of the item once the discount has been subtracted, but before any sales tax is added.
    Formula: Price After Discount = Original Price – Discount Amount
  5. Sales Tax Percentage: This is the percentage of tax applied to the discounted price. Sales tax is typically calculated on the price after any discounts have been applied.
  6. Sales Tax Amount: This is the monetary value of the sales tax. It's calculated by multiplying the Price After Discount by the Sales Tax Percentage (converted to a decimal).
    Formula: Sales Tax Amount = Price After Discount × (Sales Tax Percentage / 100)
  7. Final Price: This is the total amount you will pay, including the discounted price and the sales tax.
    Formula: Final Price = Price After Discount + Sales Tax Amount

Practical Examples

Let's walk through a couple of examples to illustrate how the calculator works:

Example 1: A Standard Discount

  • Original Item Price: $100.00
  • Discount Percentage: 20%
  • Sales Tax Percentage: 7%

Calculation:

  • Discount Amount = $100.00 × (20 / 100) = $20.00
  • Price After Discount = $100.00 – $20.00 = $80.00
  • Sales Tax Amount = $80.00 × (7 / 100) = $5.60
  • Final Price = $80.00 + $5.60 = $85.60

Example 2: A Larger Discount with No Sales Tax

  • Original Item Price: $250.00
  • Discount Percentage: 40%
  • Sales Tax Percentage: 0% (common for certain items or states)

Calculation:

  • Discount Amount = $250.00 × (40 / 100) = $100.00
  • Price After Discount = $250.00 – $100.00 = $150.00
  • Sales Tax Amount = $150.00 × (0 / 100) = $0.00
  • Final Price = $150.00 + $0.00 = $150.00

Using the Sale Price Calculator helps you quickly verify these calculations, ensuring you always know the exact cost of your purchases or the net revenue from your sales.

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