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The savings are the original price multiplied by the discount percentage divided by 100. Subtracting the savings from the original price gives the sale price you pay. A stacked second discount applies to the already-discounted price, not the original — so two 25% discounts equal 43.75% off, not 50%.
A percentage discount calculator uses two steps. First the savings: discount amount = original price × discount% ÷ 100. Then the sale price: original price − savings.
Worked example: 25% off $80. Savings = $80 × 25 ÷ 100 = $20, so the sale price is $60. What is 25% off $80? You save $20 and pay $60. What is 50% off $100? You save $50 and pay $50. To calculate a discount on a price, you only ever need those two lines — the discount formula never changes. The discount rate is simply the percentage taken off the original price — 25% off means a 25% discount rate.
How to calculate 20% off a price in your head? Find 10% by moving the decimal one place left, then double it: 20% off $80 is 2 × $8 = $16 off, so you pay $64. How to calculate 30% off a price? Triple the 10%: $24 off $80, pay $56.
Faster still: multiply by the complement. 20% off means you pay 80%, so $80 × 0.8 = $64. 25% off is × 0.75, 30% off is × 0.7, 50% off is × 0.5. These discount mental math shortcuts work on any price — a 10% move-decimal habit covers most sale signs you'll ever see. Or simply multiply by the complement: 30% off = ×0.7 (x0.7), 25% off = ×0.75, 20% off = ×0.8.
Is 20% off plus 10% off the same as 30% off? No — stacked discounts multiply, they don't add. The second discount applies to the already-discounted price. Effective discount = 1 − (1 − a) × (1 − b).
Worked: 20% then 10% off $100. After 20% the price is $80; 10% off $80 is $8, so you pay $72 — an effective discount of 28%, not 30%. How do you calculate three stacked discounts? Extend the chain: 1 − (1−a)(1−b)(1−c). Does the order of percentage discounts matter? No — multiplication is commutative, so 20%-then-10% equals 10%-then-20%. Can a fixed coupon stack with percentage discounts? Usually yes: apply the percentage first, then subtract the fixed amount — $20 off after 25% off $100 is $100 → $75 → $55. A successive discounts calculator applies each discount to the running total, one after another. The result is the equivalent single discount — the one number that replaces the whole stack. Percentage vs fixed coupon stacking works the same way: take the percentage off first, then subtract the fixed coupon.
What discount is a 2 for 1 deal really worth? If you wanted two anyway, it's 50% off each — but if you only wanted one, the "free" item isn't a saving at all. A 3 for 2 deal is a 33.3% effective discount per item (you pay for 2, get 3). A BOGO 50% off the second item is 25% off the pair. Always value multi-buy deals against what you'd actually have bought: the effective discount only counts on items you wanted.
This discount chart doubles as a quick percent-off reference:
A percent off reference table for a $100 item — scale proportionally for any price:
| Discount | You save | You pay | |---|---|---| | 10% off | $10 | $90 | | 15% off | $15 | $85 | | 20% off | $20 | $80 | | 25% off | $25 | $75 | | 30% off | $30 | $70 | | 40% off | $40 | $60 | | 50% off | $50 | $50 | | 60% off | $60 | $40 | | 70% off | $70 | $30 | | 75% off | $75 | $25 |
How to find the discount percentage between two prices? Discount% = (original − sale) ÷ original × 100. A $120 jacket selling for $90 is (120−90)÷120×100 = 25% off.
Is the discount applied before or after sales tax? Before — legitimate stores discount the price, then add tax on the discounted amount. If tax appears to be discounted too, the receipt math is wrong. The same rule covers GST and VAT in other countries — tax is added after the discount, never discounted itself.
Spot fake "was" prices: a discount is only real against a price the item actually sold at. Percent off vs markdown — same thing; "markdown" is retail jargon for a price reduction. How to find the original price before a discount? Reverse it: original = sale price ÷ (1 − discount%). A $60 sale price after 25% off means the original was $60 ÷ 0.75 = $80. Results here are exact to the cent for the inputs given; pick any currency from the selector — the math is currency-agnostic. The starting number is the list price — also called the marked price or selling price.
It means the price is reduced by that percentage of the original price. 25% off a $80 item removes $20, so you pay $60.
Multiply the price by (100 − discount%) ÷ 100. For 25% off $80: $80 × 0.75 = $60.
They multiply: apply the first discount, then the second to the reduced price. Effective discount = 1 − (1−a)(1−b). 20% + 10% gives 28% off, not 30%.
No. The second discount applies to the already-reduced price, so 20% then 10% off $100 leaves $72 — a 28% effective discount.
2 for 1 is 50% off per item if you wanted both; 3 for 2 is 33.3% off per item. Value them against what you'd actually have bought.
Before. Tax is calculated on the discounted price. A receipt that discounts the tax itself has wrong math.
Divide the sale price by (1 − discount%): original = sale ÷ (1 − discount%). $60 after 25% off means the original was $80.
Discount% = (original − sale) ÷ original × 100. $120 marked down to $90 is a 25% discount.
No — (1−a)(1−b) = (1−b)(1−a), so the effective discount is identical either way.
Usually yes: the percentage applies first, then the fixed amount is subtracted. 25% off $100 plus a $20 coupon: $100 → $75 → $55.
Yes — the calculator rounds to two decimals using standard rounding, so the figures match what a register computes for the given inputs.
Yes. Choose your currency at the top; the symbol updates everywhere and the math is identical in every currency.
No — stacked discounts multiply. Apply each to the running total: 20% then 10% off $100 gives $72, a 28% effective discount, not 30% off.
No — retailers decide whether promotions stack. Many exclude combining coupons with sale prices, so check the offer terms before assuming both apply.