Discount Calculator
A “25% off” sticker tells you the discount but not the price you actually pay. This discount calculator does the subtraction for you: enter the original price and the percent off, and it returns the final sale price along with the dollar amount you save. Use it while shopping to check a sticker, compare two deals, or decide whether a coupon stacks up — it turns a percentage marketing claim into the real number at the register.
Calculate
Default result: $60.00
Discount Calculator · Materials
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Sale price
80 × 25
Shopping list
- You save
- $20.00
Est. total
$60.00
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Reviewed by the calculators.dev team · Last updated 2026-06-23
Formula reviewed against U.S. Federal Trade Commission — Comparing prices and advertised discounts (guidance on sale and reference pricing)
How to calculate
Type the original price, then the discount percentage. The calculator keeps the share of the price you still pay — for 25% off, that is 75% — and multiplies the price by it, so $80 × 0.75 = $60. The amount saved is simply the original price minus the sale price, here $20. Change either field and both numbers update live, which makes it quick to test what a deeper discount or a higher starting price does to the final cost.
sale price = original price × (1 − discount% ÷ 100), and amount saved = original price − sale price. The “1 −” keeps the fraction of the price you still pay: a 25% discount leaves 75%, so you multiply by 0.75. A 100% discount makes the item free; a 0% discount leaves the price unchanged.
Example calculation
A $80 item at 25% off keeps three-quarters of its price: $80 × 0.75 = $60. The discount removes $20, so the sale price is $60 and the saving is $20.
- salePrice
- $60.00
- saved
- $20.00
Assumptions
- A single discount is applied to a single price — stacked or “percent off then dollars off” promotions need to be entered one step at a time.
- The discount is capped at 100%, because a larger one would imply a negative price (the store paying you).
- Sales tax is not included; the sale price is pre-tax, so add tax separately for the checkout total.
Common mistakes
- Subtracting the percentage from the price as if it were dollars — 25% off $80 is not “$80 − $25”, it is $80 × 0.75.
- Applying two discounts by adding the percentages: 20% then 10% is not 30% off, because the second cut is taken on the already-reduced price.
- Forgetting tax, which is added back on top of the sale price at checkout and can erase part of the apparent saving.
Frequently asked questions
What is 25% off $80?
The sale price is $60 and you save $20. You keep 75% of the price: $80 × 0.75 = $60.
How do I calculate a sale price?
Multiply the original price by one minus the discount as a decimal. For 30% off, multiply by 0.70.
Do two stacked discounts add together?
No. A 20% discount followed by a 10% discount is about 28% off, not 30%, because the second discount applies to the already-reduced price.
Does this include sales tax?
No. The sale price is before tax. Use a sales tax calculator on the discounted price to get the final checkout amount.