Discount Calculator

To calculate percent off, multiply the original price by the discount percentage divided by 100, then subtract from the original price. Formula: Discount Amount = Original Price × (Discount % / 100). Final Price = Original Price − Discount Amount.

To find the original price when you know the discounted price and discount percentage, use: Original Price = Discounted Price ÷ (1 − Discount % / 100). For example, if something costs $80 after a 20% discount: $80 ÷ 0.80 = $100 original price.

A stacked discount (also called stacked discount or chain discount) is when multiple discounts are applied one after another to a single item. For example, a 20% discount followed by a 15% discount on the reduced price. Unlike simple discounts, stacked discounts compound: 20% off $100 = $80, then 15% off $80 = $68, not $65.

To calculate discount with sales tax: first apply the discount to get the pre-tax price, then multiply by (1 + tax rate) to get the final amount. For example, $100 item, 20% off = $80, then 8% tax: $80 × 1.08 = $86.40 total.

Buy One Get One (BOGO) Free means you pay for one item but receive two. The effective discount is 50% per item. Calculate the per-item cost by dividing the price of one item by 2. For BOGO 50% Off (you pay full price for one, half off the second), the average discount is 25% per item.