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One discount, two discounts, tax

Discount Calculator see the real saving

Enter the price and the discount. Add a second reduction for the "extra 20% at the till" deals, and a tax rate to see the number you will actually pay.

Short answerLast edited October 31, 2026

The Discount Calculator works out the final price after one or two discounts and any sales tax, and shows how much you actually save. Two successive discounts of 20% and 10% give a total reduction of 28%, not 30%.

How it works

1

Enter the price

Add the original price and the discount.

2

Add a second discount

If a code stacks on top, add it here.

3

Read the saving

See the final price and how much you save.

Stacked discounts add up to less

Two discounts multiply, they do not add. The second one applies to the price that is left, not to the original price — and that is where the extra money in the advert evaporates.

AdvertTotal savingWhat you pay on $100
20% off20%$80.00
20% then 10%28%$72.00
20% then 20%36%$64.00
30% then 20%44%$56.00
50% then 50%75%$25.00
Buy one get one free50%$50.00

How stores phrase it

"Up to 70% off"

Means one item in the shop is 70% off. Everything else is discounted less, or not at all. The figure that matters is the one on the tag of the thing you want.

"Extra 20% off the sale price"

A real additional reduction, but calculated on the already reduced price. On a $100 item marked down 40% and then an extra 20%, you pay $48 — a 52% saving, not 60%.

"Was $199, now $129"

Meaningful only if the item was genuinely sold at $199. Many countries require a reference period of 30 days for the "was" price; not every shop respects it.

Multi-buy

Three for the price of two is a 33% saving on the items you wanted anyway, and a 100% cost on the fourth one you did not. Buy the deal only when you would have bought the quantity at full price.

Before you tap buy
  • Compare the unit price, not the pack price
  • Check the same item elsewhere for ten seconds
  • Add shipping before deciding
  • Ask whether you would buy it at full price
  • Remember the return window
How do I work out the original price?
Divide the sale price by (100 − discount) ÷ 100. A $70 price at 30% off means 70 ÷ 0.7 = $100 before the discount.
Why is 20% + 20% not 40% off?
Because the second discount applies to the reduced price. The real saving is 36%.
Should the discount be applied before tax?
Usually yes: shops discount the net price and charge tax on the result, which is what this tool models.
What is a good discount?
One that beats the price you would pay elsewhere. Ten percent on a rarely discounted item is often better than fifty percent on something marked up first.
Does it handle currencies?
The tool uses a plain currency symbol and does not convert between currencies.

The Arithmetic Retailers Count On You Skipping

Discounts are designed to be felt rather than calculated. The bigger the number on the red sticker, the less the shopper checks it.

Anchor prices

A "was" price sets the ceiling in your head. When the sale price sits close under it, the decision feels easy even if the item costs more than it did last month elsewhere.

Charm pricing

$19.99 does not round to $20 in the mind, it rounds to $19. The one cent is not the point — the leftmost digit is.

Bundle arithmetic

Three for two is 33% off the bundle. A "buy two, get 20% off" is 10% off each item. When two offers compete, convert both to a single percentage before you choose.

A price is a question

Discounts are the seller's offer, not a fact about value. If you already have a price in mind, work backwards: divide the amount you are willing to pay by the discount factor and you will see immediately whether the sale is real. The percentage calculator handles any variant of that question, and the tip calculator takes the same approach to a restaurant bill.

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Quick facts

  1. Two discounts are not added together: 20% then 10% is 28% off, because the second applies to the already reduced price.
  2. A discount is usually applied before sales tax, so the tax is charged on the lower price, which lowers the amount you pay in tax as well.
  3. The SI defines the kilo as exactly 1000 and the centi as exactly one hundredth, which is why conversions are exact, not approximate.BIPM
  4. Since 2019 the kilogram is defined by a fixed value of the Planck constant, not by a metal cylinder in Paris.BIPM

Questions people ask

Are two discounts added together or applied one after another?
They are applied one after another. A 20% discount followed by a 10% discount leaves 80% × 90% = 72% of the price, which is a 28% total reduction. Adding them would wrongly give 30%.
How do I work out the sale price?
Multiply the original price by one minus the discount rate. A 60 item at 25% off costs 60 × 0.75 = 45. To add sales tax, multiply the sale price by one plus the tax rate.
Is a 50% off sale a better deal than buy one get one free?
Not always. Buy one get one free gives the same item for half price only if you need two of it. Compare the price per unit you actually use, and remember that a discount on a higher price can still cost more than a smaller discount on a lower one.

What this page is about

  • SI units

    The International System of Units maintained by the BIPM, with the metre, kilogram, second and their prefixes defined exactly.

Official sources cited on this page

  1. The International System of Units (SI Brochure)BIPM

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