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Discount Calculator

Find the sale price after a percentage discount, with optional sales tax on top.

The price before any discount.

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

About this tool

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.

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.

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