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Discount Calculator

Enter the original price and the discount to see what you pay and how much you save. Work from a percentage off or a fixed amount off, add a second discount that applies to the reduced price, and include sales tax. If you already know both prices, switch to “Original and sale price” to find the percentage taken off.

Calculate a discount

What do you know?
%

Applied to the price after the first discount, such as an extra 10% off a sale price.

%

Added after the discount. Leave blank for none.

Fill in the fields above to see the result.

How to use it

  1. Choose what you know

    Pick “Percent off” or “Amount off” to calculate a sale price, or “Original and sale price” to find the discount.

  2. Enter the prices

    Type the original price and the discount. Optionally add a second discount and a tax rate, and choose a currency for the display.

  3. Read the result

    The tool shows what you pay, how much you save and the percentage that represents, the price after the discount and the tax.

  4. Check the working

    The steps underneath show each stage of the calculation, so you can compare it with a receipt or a price tag.

Example: an extra discount on a sale item

A jacket is priced at 120 with 30% off, and a voucher takes a further 10% off the sale price. Choose “Percent off”, enter 120 and 30, tick “Add a second discount” and enter 10. The price falls to 75.60, a saving of 44.40, which is 37% off the original, not 40%.

Why two discounts do not add up

A second percentage is taken off the already-reduced price, so the total saving is smaller than the two percentages added together.

Examples of two stacked discounts and their combined effect
First discountSecond discountTotal off the originalNot
10%10%19%20%
20%10%28%30%
30%10%37%40%
50%20%60%70%

Limits and limitations

  • Calculations are made in whole cents, and each step (each discount, then tax) is rounded half up to the nearest cent, as a till would. A shop that rounds differently, or only once at the end, can differ by a cent.
  • Tax is added after the discount as a single percentage. The tool does not handle prices that already include tax, tax that varies by item, or tiered rates.
  • Discounts of more than 100%, negative prices and discount amounts larger than the price are rejected.
  • Currency choice changes only the symbol and layout. No exchange rates are used and amounts are not converted.
  • The tool does not know a shop's rules, such as whether vouchers can be combined or whether a discount applies to every item.

Frequently asked questions

How do I calculate a percentage discount?

Multiply the price by the discount percentage divided by 100 to get the saving, and subtract it from the price. A 25% discount on 80 saves 0.25 × 80 = 20, so you pay 60.

How do I find the discount percentage from two prices?

Subtract the sale price from the original price, divide by the original price and multiply by 100. If something dropped from 80 to 60, the saving of 20 is 25% of 80, so it is 25% off.

Is tax added before or after the discount?

This tool adds tax after the discount, which is how most sales tax works: you pay tax on the price you actually pay. Rules differ by place and by type of discount, so check your receipt.

Are my numbers stored or sent anywhere?

No. What you type is processed by JavaScript running in your browser and is not sent to a server. The page itself still loads from a web server like any website. This site can load advertising or analytics scripts, but only after you accept them in the cookie notice. They are separate from the tools, which never pass the files or text you work with to them.

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