Whether you are shopping retail clearance sales, negotiating wholesale purchasing contracts, or auditing e-commerce promotional markdowns, this discount calculator delivers immediate, accurate mathematical clarity. It computes your exact dollar savings, discounted sale price, reverse original list price, and total checkout cost including sales tax. Understanding the exact arithmetic behind single and stacked discounts prevents checkout surprises and ensures you capture maximum genuine purchasing value.
To calculate a discount percentage, divide the dollar savings by the original price and multiply by 100: Discount % = (Dollar Savings / Original Price) × 100. For example, if a $50 shirt is reduced by $10, the discount rate is ($10 / $50) × 100 = 20%.
Consecutive promotions (such as 20% storewide plus a 10% loyalty voucher) apply sequentially to the dwindling balance rather than concurrently to the starting price. On a $100 purchase, 20% cuts the balance to $80, and the subsequent 10% deducts $8, yielding a $72 price. The total savings is $28 (28%), not $30 (30%).
Divide the sale price by 1 minus the discount rate expressed as a decimal: Original Price = Sale Price / (1 - Discount / 100). For instance, if you paid $60 for an item marked 40% off, Original Price = $60 / (1 - 0.40) = $60 / 0.60 = $100.
In most jurisdictions, retail sales tax is assessed strictly on the final discounted sale price agreed upon at the cash register, because that represents the actual gross taxable transaction. Some exceptions exist for manufacturer rebates where the seller is reimbursed externally.
While often used interchangeably in everyday speech, a discount typically refers to a temporary promotional price reduction for a customer or order (e.g., promo codes, cash discounts), whereas a markdown represents a permanent downward repricing of inventory on the shelf to stimulate liquidation.
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Calculate promotional sales prices, savings percentages, and final tax-inclusive invoices.
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