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%.
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.
Why This Calculator Matters
Percentage calculations underpin countless everyday decisions, from evaluating sale discounts to understanding loan interest rates to interpreting statistical data. While the math itself is straightforward, applying the right formula to the right situation requires understanding the specific context — whether you need percentage change, percentage difference, markup, margin, or a weighted average. Using the wrong formula leads to incorrect conclusions that can cost money or misrepresent data.
Our tools are designed to be fast, accurate, and educational. Each calculator not only produces the result but shows the formula and intermediate steps so you understand the math behind the answer. This transparency helps students learn the concepts, professionals verify their work, and everyone build stronger numerical intuition over time. Bookmark the calculators you use most often for instant access whenever percentage math comes up in your daily life.