How to use the discount calculator
- Enter the original price.
- Enter the discount percentage.
- Add an extra discount if the deal stacks (for example, “an extra 10% off sale items”).
- Add sales tax to see the final amount at the checkout.
Stacked discounts don’t add up
“25% off, then an extra 10% off” is not 35% off. The second discount applies to the already-reduced price: 25% off $80 is $60, and 10% off $60 is $54. That’s 32.5% off in total. The calculator shows the true combined saving.
The formula
sale price = price × (1 − discount ÷ 100) × (1 − extra ÷ 100). Tax, if you add it, is then charged on the sale price.
Examples
You pay $60.00 and save $20.00
You pay $58.32 · total saving 32.5%