How it works
How to use this discount calculator
- Choose Single discount or Stacked discounts.
- Enter the original price and the first rate. For stacked mode, enter the second rate.
- Read the sale price, the amount saved, and—when stacked—the equivalent single discount.
Formula
The calculation formula
Sale price = Original × (1 − Discount % ÷ 100)01
Convert each discount from a percent to a remaining-price factor.
02
Multiply the original price by those factors in order.
03
Subtract the sale price from the original to see the amount saved.
Worked examples
Example calculations
Single discount
$80 × (1 − 25 ÷ 100) = $60. You save $20.
Stacked discounts
$100 × 0.80 × 0.90 = $72. That is 28% off in total, not 30%. Each rate must be between 0% and 100%.
When to use it
Common use cases
- Apply a single percent-off ticket
- Stack a coupon after a sale price
- See why 20% then 10% is not 30% off
Limits
Assumptions and limits
- Discounts apply sequentially to the remaining price. They are not added as percents.
- Tax, shipping, and rebates after the sale are not included.
- Currency display uses USD rounding to 2 decimal places.
Questions
Frequently asked questions
Why is 20% then 10% not 30% off?
The second discount applies to the already reduced price. $100 × 0.80 = $80, then $80 × 0.90 = $72, which is 28% off.
Should I enter tax?
Enter the pre-tax price if the store discounts before tax. Enter the taxed amount only if the markdown is taken on that total.
Sources
Sources and review
- Investopedia — discount
A discount as a reduction from the listed price; successive rates multiply remaining factors
Accessed August 25, 2026