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Discount Calculator

Work out sale prices, stacked discounts and how much you actually save.

To calculate a discount, enter the original price and the percentage off. If a second "extra percent off" applies, it is calculated on the already-reduced price, which is how retailers actually stack offers — the combined saving is always less than adding the two percentages.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How do I combine two discounts?

Multiply, do not add. A 20% discount followed by a further 10% is not 30% — it is 0.8 × 0.9 = 0.72, so 28% off. Stacked discounts always total less than their sum.

What does the original price mean in a sale?

Legally it must be a price genuinely charged for a meaningful period, though enforcement varies. A "was" price that was never really charged is a pricing practice regulators in the UK and EU have repeatedly acted against.

How to use the discount calculator

  1. 1Set the original price.
  2. 2Set the discount.
  3. 3Set the extra discount.
  4. 4The result appears immediately — copy or download it.

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Put the working discount calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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