Toolkeel

Discount calculator

Check what you will really pay in a sale, including "extra 10% off" offers and tax at the till.

  • Free
  • Private
  • No sign-up
You pay

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You save

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Tax included above

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Total discount

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You pay —
You save —
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How to use it

  1. Enter the original price and the discount percentage.

  2. Add an extra discount or tax rate if the offer has one.

  3. Read the price you pay and how much you save.

About this tool

Stacked discounts multiply rather than add: 25% off and then an extra 10% off is a total discount of 32.5%, not 35%, because the second discount applies to the already reduced price. Tax is calculated on the discounted price, as shops normally do.

Good to know

  • Assumes percentage discounts; fixed-amount coupons are not included.
  • Prices are rounded to two decimals.

Frequently asked questions

How do I calculate 30% off a price?

Multiply the price by 0.70. For example, 30% off 150 is 105, saving 45.

Is 20% off plus an extra 10% off the same as 30% off?

No. It is 28% off in total, because the extra 10% applies to the already reduced price.

Should tax be added before or after the discount?

Normally after: the tax is charged on the discounted price, as this calculator does.

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Last updated 2026-10-20 by the Toolkeel team. How we build and check our tools.