Discount Calculator
Enter a price and a percentage off to see what you will pay. Add a second discount to see why "25% plus an extra 10%" is not 35% off.
How the discount is calculated
Sale price = Original price × (1 − Discount ÷ 100)
A 25% discount on 80 saves 80 × 0.25 = 20, so you pay 80 × 0.75 = 60. The calculator works in any currency; amounts are shown rounded to two decimal places.
Stacked discounts do not add up
"25% off, plus an extra 10% at checkout" is not 35% off. The second discount is taken from the already-reduced price:
Final price = Price × (1 − d₁ ÷ 100) × (1 − d₂ ÷ 100)
On an 80 item: 80 × 0.75 = 60, then 60 × 0.90 = 54. You save 26, which is an effective discount of 32.5%, not 35%. The order of the two discounts does not change the final price, because multiplication gives the same result either way.
Sales tax and VAT
How tax appears on a price tag depends on where you are. In the United States and parts of Canada, sales tax is usually added at the till, so the tax field lets you add it after the discount. In the UK, the European Union, Australia and many other countries, shelf prices normally already include VAT or GST, so leave the tax field blank there. If you enter both a discount and tax, this calculator applies the discount first and the tax to the reduced price, which is how sales tax on discounted goods generally works, though coupon rules vary by jurisdiction.
Worked example with tax: the 54 price above plus 8% sales tax is 54 × 1.08 = 58.32.
Finding the percent off from two prices
Percent off = (Original − Sale) ÷ Original × 100
A jacket reduced from 120 to 90 is (120 − 90) ÷ 120 × 100 = 25% off.
Common questions
How do I find the original price from a sale price?
Divide the sale price by (1 − discount ÷ 100). If 60 is the price after 25% off, the original was 60 ÷ 0.75 = 80. The percentage calculator can do this with its "X is P% of what number" tool (60 is 75% of 80).
Is a bigger discount on a pricier item a better deal?
Not necessarily. Compare what you actually pay per unit you need. The unit price calculator compares pack sizes directly.
Why might the shop's total differ by a cent or two?
Shops may round at each step, round per item rather than per basket, or calculate tax per line. This calculator keeps full precision until the final display, so differences of a cent can occur.