calculationType
Discount Calculator
Calculate discount amounts and final sale prices. Perfect for shopping, comparing deals, and finding actual savings on purchases.
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Discount Calculator | Calculate Sale Price & Savings Amount
Calculate discount amounts and final sale prices. Perfect for shopping, comparing deals, and finding actual savings on purchases.
Key values: $120 original · 25% off · sale price = $90
Stacked Discounts: 20% Off, Then Additional 10% Off
A $200 item has 20% off, then an additional 10% off the sale price. Is this the same as 30% off?
Key values: $200 · 20% + 10% · final = $144, not $140
Discount Calculation
A 25% discount on a $120 item: Sale price = $120 × 0.75 = $90.
Stacked Discounts
When discounts are applied sequentially (e.g., “20% off, then an extra 10% off”), they do not add up to 30%:
Example: $200 item with 20% off, then 10% off:
The effective discount is 28%, not 30%. The second discount applies to the already-reduced price.
Order doesn't matter: Multiplication is commutative, so 20% then 10% gives the same result as 10% then 20%.
Savings Perspective
Another way to think about discounts — your effective cost per dollar of original value:
| Discount | You pay | On a $100 item |
|---|---|---|
| 10% | $0.90 per $1 | $90 |
| 25% | $0.75 per $1 | $75 |
| 33% | $0.67 per $1 | $67 |
| 50% | $0.50 per $1 | $50 |
| 75% | $0.25 per $1 | $25 |
Frequently Asked Questions
How do I calculate the sale price after a discount?
Multiply the original price by . For example, 25% off $120: Sale price = \\$120 \times 0.75 = \\$90. This is faster than calculating the discount amount separately and subtracting.
Do stacked discounts add up?
No. Sequential discounts multiply, not add. 20% off then 10% off gives a total discount of 28%, not 30%. The math: , meaning you pay 72% of the original (28% off).
Does the order of stacked discounts matter?
No. Since multiplication is commutative, 20% then 10% gives the same result as 10% then 20%. Both yield a 28% total discount.
How do I find the original price from the sale price and discount?
Divide the sale price by . For example, if the sale price is $90 after 25% off: Original = \\$90 / 0.75 = \\$120. Do not add 25% to $90 — that gives $112.50, which is wrong.
How do I compare two different discount offers?
Convert both to the final price you would pay. For example, “30% off $100” gives $70, while “buy one get one 50% off on two $50 items” gives $75. Always compare the actual amount you spend, not just the percentage.
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