Discount Calculator
Calculate sale prices, savings, and stacked discounts
Calculate Your Discount
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How to Calculate a Discount
To calculate a discounted price, multiply the original price by (1 - discount/100). For example, a $120 item at 25% off: $120 × (1 - 0.25) = $120 × 0.75 = $90. You save $30. Our calculator also factors in sales tax to show you the true final price.
Double Discount Trap
A common misconception: a 20% off coupon on a 30% sale item is NOT 50% off. The 20% applies to the already-reduced price. So $100 at 30% off = $70, then 20% off $70 = $56. That's 44% off, not 50%.
Helpful context
Discount math looks simple until multiple promotions, coupons, or stacked percentages are involved. A dedicated calculator helps you separate the original price, the amount saved, and the final amount due so you can compare offers cleanly. It is particularly useful when two stores advertise different sale structures that sound similar but produce different final totals.
Practical example
The Discount Calculator page is also a good double-check when you are moving between calculator results and spreadsheet work. Many people know the rough idea of the math but still make small setup errors when a value needs to be rounded, reformatted, or interpreted in context. Keeping the explanation tied to the specific discount calculator workflow makes those mistakes easier to catch.
How to Calculate Discounts
Calculating a discount is straightforward: multiply the original price by the discount percentage (as a decimal), then subtract the result from the original price. For example, a 25% discount on a $80 item: $80 × 0.25 = $20 off, so the sale price is $60.
Stacking discounts: When stores offer "an additional 20% off sale prices," the discounts multiply — they don't add. A $100 item at 30% off is $70, then an additional 20% off the sale price is $70 × 0.80 = $56. That's a total savings of 44%, not 50%.
Is it really a deal? Retailers frequently inflate original prices to make discounts appear larger. A "60% off" sale sounds incredible, but if the original price was artificially high, you may not be saving much. Compare the sale price to prices at other retailers, not just to the listed "original" price.
Tip for shoppers: The "price per unit" is more useful than the sticker price when comparing deals. A 24-oz bottle for $4.99 ($0.21/oz) is a better deal than a 12-oz bottle for $2.99 ($0.25/oz), even though the smaller bottle has a lower sticker price.