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Stacked discounts multiply β 20% then 10% equals 28% off in total, not 30%.
Estimates only β not financial advice.
That "50% OFF" tag looks simple, but sale math trips up smart people every day: how much do you actually save, what is the final price after tax, and does an extra 10% off really mean 30% total? Our free Discount Calculator answers all of it instantly. Enter the original price and the discount percentage to see your savings and the final price β or work backwards from a "was/now" price pair to reveal the true discount percentage hiding behind the marketing.
Retailers design sale labels to feel generous; this tool lets you check the arithmetic before you buy. It handles single discounts, reverse calculations, and stacked discounts (computed the honest way β sequentially, not added), with an optional tax add-on so the number on screen matches the number at the register. Everything runs in your browser, free, with no sign-up. As always, results are estimates for reference β not financial advice.
The classic case. Enter the original price and the discount percentage, and the tool shows two numbers that matter: you save (the dollar amount) and final price (what you pay). A $120 jacket at 25% off saves you $30 and costs $90. Simple β but worth verifying, because mislabeled sale tags are more common than shoppers think.
See a "Was $89, now $62" label and want the real percentage? Enter both prices and the tool computes the discount: ($89 β $62) Γ· $89 = 30.3%. This mode is your defense against anchor pricing β the retail trick of showing an inflated "original" price to make the discount look bigger. The percentage never lies, even when the label is designed to impress.
Here is where most people get it wrong. A "20% off, plus an extra 10% off at checkout" deal is not 30% off. Discounts apply one after another: 20% off $100 leaves $80, then 10% off $80 leaves $72 β a total saving of 28%, not 30%. The tool applies each discount in sequence and shows the true combined percentage, so coupon-stackers and clearance hunters always know the real deal. Need the raw percentage math? Our Percentage Calculator walks through it.
Understanding the psychology makes the calculator more useful. Retailers routinely display a high "reference price" next to the sale price because shoppers judge a deal by the gap, not by the absolute price. "Was $200, now $99" feels like a steal even if the item rarely sold at $200. Limited-time banners, countdown timers, and "extra % off" coupons all amplify the feeling of a bargain. None of this is necessarily dishonest β but the only number that matters is the final price compared to what competitors charge for the same item. Run the was/now pair through the reverse mode, then compare the final price elsewhere before deciding.
A discount tells you the pre-tax price; the register tells you the rest. Toggle the tax add-on, enter your local sales tax or VAT rate, and the tool adds it to the discounted price so there are no surprises at checkout. Shopping across borders? Our Currency Converter keeps foreign sale prices in your own currency, and the Tip Calculator handles the other checkout math β splitting bills and adding gratuities.
Example 1 β the straightforward sale. A $250 pair of headphones is 35% off. Savings = $87.50, final price = $162.50. With 8% sales tax toggled on, the register total is $175.50.
Example 2 β checking the label. A store advertises "Was $140, now $98 β 30% off!" Reverse mode: (140 β 98) Γ· 140 = 30.0%. The label is honest this time β but now you know how to check every time.
Example 3 β the coupon stack. A $200 coat is 25% off, and you have a 15%-off coupon for sale items. Sequential math: $200 β $150 β $127.50. Total discount = 36.25%, not 40%. On a $200 purchase, the naive "add the percentages" mistake would mislead you by $7.50.
Example 4 β the sneaky re-anchor. A gadget is "Was $79, now $59" at one store and "$59, save 25%" at another. Reverse mode confirms both are the same 25.3% discount β the second store just skipped the theater. Buy on final price, not on presentation.
A discount only saves money if you were going to buy the item anyway. Behavioral research consistently shows that sale framing increases spending: shoppers buy things they do not need because the discount feels like the product. Before any purchase, ask two questions the calculator cannot answer: "Would I buy this at full price?" and "Is this the best final price available?" If the answer to the first is no, the discount is 100% off something you should not buy at all.
The calculator computes exact arithmetic from your inputs, but it cannot verify that the "original price" a retailer shows is genuine β inflated reference prices are a labeling issue, not a math issue. It also does not account for shipping costs, membership fees, cashback quirks, or currency conversion spreads on cross-border orders. Use it as a fast, honest check on the numbers in front of you β an estimate for smarter shopping, not financial advice.
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Is 20% off plus 10% off equal to 30% off? No. Discounts apply sequentially: 20% off $100 = $80, then 10% off $80 = $72, for a true total of 28%. Never add discount percentages together.
How do I find the original price from a sale price? Divide the sale price by (1 β discount). A $72 item at 28% off was originally $72 Γ· 0.72 = $100.
Should tax be calculated before or after the discount? In almost all jurisdictions, sales tax applies to the discounted price β which is exactly how this tool's tax add-on works.
Why do stores show "up to 70% off"? Because the headline percentage usually applies to a handful of clearance items, while most of the store is discounted far less. Always run the specific item's was/now prices through the reverse mode instead of trusting the banner.
Are the results financial advice? No. The tool performs standard discount arithmetic. Spending decisions are yours; for significant financial planning, consult a qualified professional.
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