Discount Calculator
Calculate discount amounts and final prices with percentage or dollar-off discounts.
How It Works
- 1
Enter the original price
Type the item's original price. Choose between percentage discount (% off) or dollar discount ($ off) mode.
- 2
Set the discount amount
Enter the discount percentage or dollar amount. The calculator instantly shows savings and final price.
- 3
Compare deals
Switch between modes to compare different discount offers. See the effective savings percentage.
Worked example: 30% off a $120 item
A retail price of $120 marked 30% off, with no extra coupons stacked.
- Discount amount = 120 ร 0.30 = $36.00.
- Sale price = 120 โ 36 = $84.00.
- Savings percent = (36 รท 120) ร 100 = 30%.
- Check with a flat $36 off: same final price; a second 10% off $84 would be stacked, not 40% off the original.
You save $36 and pay $84. Stacked discounts multiply, they do not add.
Discount formulas
discount = price ร (percent รท 100) sale = price โ discount savings % = (discount รท price) ร 100
- price
- original (pre-discount) price
- percent
- markdown rate (e.g. 30 for 30%)
- discount
- dollars saved
- sale
- amount due after the markdown
Two sequential discounts of 20% then 10% equal 28% off overall (0.8 ร 0.9 = 0.72), not 30%. Use the percentage calculator for percent-change math that is not a retail markdown.
Sale price on a $100 item
| Markdown | You save | You pay |
|---|---|---|
| 10% | $10 | $90 |
| 20% | $20 | $80 |
| 25% | $25 | $75 |
| 40% | $40 | $60 |
| 50% | $50 | $50 |
How Discounts Are Calculated
Discounts are the most common price adjustment consumers encounter. A percentage discount is calculated by multiplying the original price by the discount rate: 25% off $80 means $80 ร 0.25 = $20 savings, final price $60. The 'Rule of 100' from marketing psychology suggests that percentage discounts feel larger for items under $100, while dollar amounts feel larger for items over $100. Our calculator supports both percentage-off and dollar-off modes, instantly showing the discount amount, final price, and effective savings percentage. This makes it useful for comparing deals across stores and evaluating coupon values.
Common pitfalls
Stacked discounts do not add. 30% off followed by 20% off is not 50%. The math is 0.7 x 0.8 = 0.56, a 44% total discount. A $100 item ends at $56, not $50.
'Up to X% off' is a ceiling, not the storewide rate. A sale advertised as 'up to 70% off' usually means one item in the back is 70% off and the rest are 10-20%. Read the tag, not the banner.
BOGO 50% off equals 25% off the total only when you buy exactly two equal items. Buy one at $100, second at $50 is $150 for $200 of merchandise. If you only needed the first item, you paid full price.
Returns refund the price you paid, not the current price. Return a $50 item bought on a 50% sale during a 70% markdown and the refund is $50, not the new sale price. Some stores issue store credit at a different rate at clerk discretion.
Coupon stacking rules vary by retailer. Target and CVS publish formal policies (one manufacturer coupon plus one store coupon per item); many grocery chains have no written rule and enforce one-per-transaction. Check before the register.
Frequently Asked Questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage (as a decimal), then subtract from the original price. For example, 25% off $80: $80 ร 0.25 = $20 discount, final price = $60.
How do I calculate what percentage I'm saving?
Divide the discount amount by the original price and multiply by 100. For example, saving $15 on a $60 item: ($15 รท $60) ร 100 = 25% savings.
Is a percentage discount or dollar discount better?
It depends on the price. The "Rule of 100" suggests: for items under $100, a percentage discount feels larger; for items over $100, a dollar amount feels larger. For example, "25% off" sounds better than "$5 off" on a $20 item.
How do stacked discounts work?
Apply each discount to the current price in order. 20% off then 10% off a $100 item is $80 after the first cut and $72 after the second (28% total), not $70. Enter one combined rate only when the store literally advertises a single rate.
Is "$20 off" better than "20% off"?
It depends on the sticker price. $20 off beats 20% when the item costs less than $100; 20% wins above $100. On $80, $20 off leaves $60 while 20% leaves $64. On $150, 20% leaves $120 while $20 off leaves $130.
When should I use the discount calculator vs the tip or percentage calculators?
Use discount for sale price and savings on a retail sticker. Use tip when you are adding gratuity to a bill. Use percentage for part-of-whole, percent-of, or percent-change problems that are not a markdown.
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Calculation record
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