Discount Calculator

Stacked discounts are applied sequentially, not added together. A 30% discount followed by an additional 20% discount does NOT equal 50% off. First, 30% is taken off the original price, then 20% is taken off the already-reduced price: 0.7 × 0.8 = 0.56, meaning you pay 56% of the original — a 44% total discount.

Use the 'Calculate Original Price' mode. If you know the sale price and the discount rate, the original price = sale price / (1 - discount rate). For example, if an item is $60 after a 25% discount: $60 / (1 - 0.25) = $60 / 0.75 = $80 original price.

Discount rate is the percentage reduced from the original (selling) price. Markup is the percentage added above the cost (purchase) price. They produce different numbers: a $50 cost item sold at $100 has a 100% markup but a 50% discount returns it to cost. Retailers use markup for pricing; consumers see discount rates in sales.