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Discount Calculator

Private: nothing leaves your browser

  • You pay -
  • You save -
  • Discount -
  • List price -
  • Final price -

Work out what you pay after a percentage off, or go the other way: from the amount you paid back to the original price, or from two prices to the discount that was really given. Every case shows the amount saved as well as the total.

About this discount calculator

A sale price is easy to work out and surprisingly easy to be misled by. The three modes here answer the three questions that actually come up in a shop: what will this cost after the discount, what was it before the discount if this is what I paid, and is the sticker on this shelf really the percentage it claims. The last one catches inflated list prices, which is the most common trick in a sale.

The amount saved is shown next to every answer, because a percentage on its own hides the size of the deal. Thirty percent off a small purchase and five percent off a large one can be the same money, and the rupee figure is the one worth comparing. For a percentage question with no price attached, the percentage calculator answers four of them side by side.

How to calculate a discount

  1. Pick the mode that matches your question with the buttons at the top.
  2. Take a percent off: enter the list price and the discount to get the sale price.
  3. I paid this much: enter what you paid and the discount to recover the original price.
  4. What percent off is it: enter both prices and read the real discount. A price above the list price is reported as a markup.
  5. Press Copy breakdown for all four figures as plain text.

Common questions about discounts

How do I find the original price from what I paid?
Divide what you paid by 1 minus the discount as a decimal. Paying 3249 after 35 percent off means the list price was 3249 divided by 0.65, which is 4998.46. Multiplying the paid amount by 1.35 instead is the common mistake and gives a number that is too low, because the discount was taken off the larger price.

Do two discounts add up?
No. Twenty percent off and then a further ten percent off is not thirty percent off, it is twenty eight. The second discount applies to the already reduced price. To check a stacked offer, run the first discount here, then put the answer back in as the list price and run the second.

Is the discount worked out before or after GST?
A trade discount shown on the invoice comes off the taxable value first, and GST is then charged on the reduced amount. This calculator works on whatever prices you give it, so if your figures already include GST the answer includes it too. To separate the tax, use the GST calculator on the result.

What if the final price is higher than the list price?
Then it is a markup, not a discount, and it is labelled as one rather than shown as a negative percentage. The percentage is still measured against the list price, so 100 rising to 125 is a 25 percent markup. This is worth checking whenever an old price looks suspiciously round.

Are my prices sent anywhere?
No. The arithmetic is JavaScript running on this page, so the prices stay on your own device. Nothing is uploaded, logged or saved, and the page keeps working with your connection switched off.

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