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How to Use the Discount Calculator
Sale signs shout the percentage, but what matters is the price you actually pay. Enter the original price and the discount percentage, add a second discount if the shop stacks one, and add tax if you want the checkout total, then press Calculate Sale Price. You get the price after each discount, the total saved, the effective discount and the final price with tax.
The insight most shoppers miss is that stacked discounts do not add up. A 25% discount plus a further 10% off is not 35% off: the second discount applies to the already-reduced price, giving 32.5% off in total. The effective discount row in the result shows the true figure, so a deal that looks like 35% off is priced honestly here.
One caveat: the final price assumes tax is charged on the discounted price, which is the usual shop practice, but tax rules vary by country and product. Also judge the deal by the final price, not the claimed percentage — a big discount on an inflated original price can still cost more than the same item elsewhere.
For any other percentage problem, such as working out what percentage one number is of another, try our Percentage Calculator, and for splitting a bill with a tip, use the Tip Calculator.
Frequently Asked Questions
How do you calculate a discount price?
Sale price = original price x (1 - discount / 100). A 25% discount on 1,000 gives 1,000 x 0.75 = 750, so you save 250. The amount saved is simply original price minus sale price.
Are two discounts added together?
No. Discounts apply one after another, not added up. A 25% discount followed by 10% off gives 1,000 x 0.75 x 0.90 = 675, a total saving of 32.5%, not 35%. This calculator applies the second discount to the already-discounted price, as shops do.
Is tax charged on the original or the discounted price?
In most shops tax is charged on the price you actually pay, after discounts. That is why this calculator applies tax last, on the discounted price. Rules vary by country and product, so check your receipt if the tax looks different.
What is the difference between a discount and a coupon?
A discount lowers the listed price by a percentage; a coupon usually takes a fixed amount off or a percentage off at checkout. Both end at the same question this calculator answers: what do you actually pay, and how much did you save?
How can I check a sale is genuine?
Compare the sale price with the same item's price at other shops and over time. A large claimed discount on an inflated original price can still be a poor deal, so judge the final price you pay, not the percentage claimed.
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