Discount Calculator

A discount calculator tells you what you will actually pay after a sale price is applied — and, if you like, after sales tax is added back on top. It removes the guesswork from "25% off" signs and helps you compare deals across shops. How to use it: enter the original price and the discount percentage. If your region adds sales tax at the register, enter the tax rate too — it is applied to the discounted price, which is how most checkouts work. Pick a display symbol ($, €, £, kr or none) purely for readability; the math is the same in any currency. The formulas: discount amount = price × (discount ÷ 100); discounted price = price − discount amount; tax amount = discounted price × (tax ÷ 100); final price = discounted price + tax amount. So a $100 item at 20% off costs $80, and with 25% tax the final price is $100.

The price before any discount.

Applied to the discounted price, as at most checkouts. Leave empty for no tax.

Frequently Asked Questions

Multiply the original price by the discount percentage divided by 100, then subtract that from the price. A $100 item at 20% off: 100 × 0.20 = $20 discount, so you pay $80.

At almost every checkout, tax is charged on what you actually pay — the discounted price. This calculator follows that convention: an $80 discounted price with 25% tax comes to $100 final.

Sequential discounts multiply rather than add. 20% then 10% leaves you paying 0.80 × 0.90 = 72% of the original — a 28% total discount, not 30%. Run the calculator twice, feeding the first result into the second.

Percentages work identically in every currency, so the symbol is purely cosmetic. Choose $, €, £, kr, or no symbol — the numbers do not change.

No. A 100% discount already makes the item free; anything beyond that would mean the shop pays you. The calculator accepts discounts from 0 to 100 percent.