How to use the Discount Calculator
- Enter the original price.
- Enter the discount percentage.
- Optionally add an extra discount and a tax rate.
- See the final price and total savings.
Discount formula
Sale price = Original price × (1 − Discount ÷ 100)
Example: a 2,499 item with 30% off costs 2,499 × 0.70 = 1,749.30, saving 749.70.
Stacked discounts are not added together
“40% off + extra 10%” is not 50% off. The extra 10% applies to the already reduced price, so the total discount is 1 − (0.60 × 0.90) = 46%. The calculator shows this effective discount for you.
Frequently asked questions
Is tax applied before or after the discount?
In most shops tax is charged on the discounted price, which is what this calculator does.