Discount Calculator
Original price, percent off, done. Add a second stacked discount ("extra 20% off clearance") and tax to see the real checkout total.
e.g. "extra 20% off sale items"
You pay
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You save
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Effective discount
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Stacked discounts don't add up — literally
"25% off, plus an extra 20% off" is not 45% off. The second discount applies to the already-reduced price: $80 → $60 after 25%, then → $48 after the extra 20%. Total effective discount: 40%, not 45%. Retailers know most shoppers add the numbers; now you're not most shoppers.
Quick mental math for the checkout line
- 10% off: move the decimal — $47.90 → $4.79 off.
- 25% off: quarter the price and subtract, or × 0.75.
- 30% off: 3 × the 10% figure.
- Stacked: multiply the "keep" fractions: 25% + extra 20% off = 0.75 × 0.80 = pay 60%.
Is the "deal" actually a deal?
Compare against the lowest recent price, not the inflated "was" price. A genuine benchmark: many retailers cycle 20–30% promotions frequently, so a 40%+ effective discount on something you already planned to buy is usually strong; 10–15% off is marketing noise.
Frequently asked questions
Does tax apply before or after the discount?
After, virtually everywhere — you pay tax on the amount actually charged. This calculator applies tax to the discounted price.
How do I compare "$15 off" vs "20% off"?
Convert the dollar amount to a percentage of the price: $15 off an $80 item is 18.75%, so 20% off wins. On a $60 item, $15 off is 25% and beats it.
What about "buy one get one 50% off"?
Across two identical items, that's 25% off the total. BOGO-free is 50% off the pair — but only if you genuinely wanted two.