Free online tool
Discount Calculator
Enter the original price and discount to see the sale price, dollars saved and optional tax.
How the discount is calculated
The math is simple but easy to fumble under time pressure: savings = price × discount / 100, and sale price = price − savings. This tool does the arithmetic instantly so you can compare deals side by side while you shop, quote a client a promotional rate without spreadsheet gymnastics, or double-check that a headline "70% off" price on a landing page is actually 70% off.
Why an optional tax field
In many countries the shelf price already includes VAT or GST, but in the United States sales tax is added at checkout. Include your local rate to see the true amount you'll pay. The tool applies tax to the discounted price, which is what most jurisdictions actually charge — you are taxed on the price you paid, not the sticker price you didn't pay.
Buying tips
A discount is only a bargain if you would have bought the item at full price anyway. Retailers routinely inflate the "original" price before a sale to make the discount look larger — check the price history on a tool like Keepa or CamelCamelCamel before celebrating a deal. And remember that shipping, warranty upsells, and payment-plan interest can quietly erase a 20% headline discount.
+Does this work with multiple discounts?
For stacked discounts, apply them sequentially — this tool handles one discount at a time, which matches how most stores actually calculate them.
+Can I use a different currency?
The math is currency-agnostic; the display uses USD symbols. Multiply your local price directly — the percentage stays the same.
+What is a 'true' discount?
It's the discount off the item's real market value, not the marked-up sticker price. Always compare to what the item usually costs elsewhere.
Why two discounts stacked together don't simply add up
Calculating a sale price is straightforward multiplication: original price times (1 minus discount as a decimal). The part that trips people up is when a store advertises two discounts applied one after another, because percentages off a shrinking price are not the same as adding the percentages together.
Retail pricing psychology leans on this gap between intuition and arithmetic constantly, from stacked coupon promotions to clearance racks marked '50% off, then an extra 20% off' — both feel generous, but the actual combined saving is consistently smaller than shoppers estimate in their heads.
The stacking trap
If an item is marked 30% off and then an extra 10% off at checkout, most people assume that's 40% off total. It isn't — the second discount applies to the already-reduced price, so the combined effect is closer to 37%. Retailers rely on this psychology to make stacked promotions look more generous than the arithmetic actually delivers.
Worked example
A jacket priced at 120 gets 30% off first, dropping it to 84. Then a further 10% off that 84 knocks off 8.40, landing on a final price of 75.60. Compare that to a naive 40% off 120, which would incorrectly suggest 72 — a difference of 3.60 that adds up across a whole shopping cart.
Add a third discount to the mix — say a 5% loyalty coupon applied last — and 75.60 drops by another 3.78 to 71.82, still notably above the naive 'add all three percentages' guess of 66.
Working backward from a sale tag
This calculator also helps in reverse: if you know the discounted price and the percentage off, you can recover the original price by dividing the sale price by (1 minus the discount as a decimal). A jacket marked at 75.60 after 30% off implies an original price of 75.60 divided by 0.7, which checks out at 108 — useful for spotting inflated 'original' prices some retailers display before a fake markdown.
A quick check before you check out
Always run stacked promotions through the actual sequential math, or a calculator like this one, before assuming the advertised total; this tool gives an accurate estimate of the final price, but sales tax, shipping, or store-specific coupon rules can still shift what you actually pay at checkout, so it's a shopping aid rather than a guarantee of the receipt total.
Comparing percentage-off versus fixed-amount coupons
A '20% off' coupon and a '20 off' coupon behave very differently depending on the cart total: on a 60 purchase, 20% off saves 12, while a flat 20 off saves more. On a 200 purchase, the percentage coupon saves 40, comfortably beating the flat 20. Comparing both types side by side, rather than assuming the bigger printed number wins, usually reveals which coupon actually saves more for your specific cart.
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