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
calculators.dev
Sale price
80 × 25
Shopping list
- You save
- $20.00
Est. total
$60.00
Estimate — confirm w/ supplier · calculators.dev
Reviewed by the calculators.dev team · Last updated 2026-06-23
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.