Discount Calculator
This discount calculator handles three common scenarios: calculating the final price when you know the original price and discount percentage; finding the discount percentage when you know both the original and sale prices; and applying multiple sequential discounts (common in wholesale, retail promotions, and stacked coupon codes). Note that multiple discounts do not simply add up — a 20% discount followed by a 10% discount equals a combined discount of 28%, not 30%.
Frequently Asked Questions
How do I calculate a discount percentage?
Discount % = ((Original Price − Sale Price) / Original Price) × 100. For example, if an item costs $120 originally and is sold for $90, the discount is ((120 − 90) / 120) × 100 = 25%.
Why don't multiple discounts add up?
Stacked discounts apply sequentially to the reduced price. A 20% off followed by 10% off: after the first discount, you pay 80% of original; the second discount applies to that 80%, leaving 72% of the original — a total saving of 28%, not 30%. Always calculate step by step.
What is the formula for final price after discount?
Final Price = Original Price × (1 − Discount% / 100). Example: $200 with a 15% discount → $200 × (1 − 0.15) = $200 × 0.85 = $170. Savings = $30.
What is a "stacked" discount?
Stacked or sequential discounts mean applying one discount after another. Common in retail (clearance + coupon), wholesale, or B2B pricing. The order does not matter for the final result — 20% then 10% gives the same result as 10% then 20%.