Currency: USD
Enter all amounts in USD. Changing currency keeps numbers unchanged; no exchange rate is applied.
- Final price with tax
- $80.00
- Price before tax
- $80.00
- Savings before tax
- $20.00
How it works
Reversing a discount needs a larger percentage
A 25% discount takes 80 down to 60. Returning from 60 to 80 requires a 33.33% increase, because the base is now smaller; use the original-price mode rather than adding the discount percentage back.
Why successive discounts do not simply add
A second percentage discount normally applies to the price remaining after the first reduction. Use the consecutive-discount mode to see that effect rather than adding the two percentages. The known-pair mode can work backward from a final price or saving. Keep the original price visible when comparing promotions so that a larger advertised percentage is not mistaken for a lower final cost.
Calculate: formula and assumptions
Discounted price = original×(1−discount rate)−fixed discount.
Enter amounts in the same currency. Tax and commission rules can vary by contract and jurisdiction.
Two consecutive discounts: formula and assumptions
Final price=original×(1−first discount)×(1−second discount).
Successive discounts multiply; they generally do not add.
Discount from a selected known pair: formula and assumptions
Final = original − savings = original × (1−discount).
Fixed savings and percentage discounts are distinct inputs. A zero final price with 100% off cannot identify the original price.
Worked example
Reference example currency: USD. These fixed examples do not change with your calculator preferences.
Using the Calculate example:
- Original price ($)
- 100
- Percentage discount (%)
- 20
- Additional fixed discount ($)
- 0
- Sales tax after discount (%)
- 0
Discounted price = original×(1−discount rate)−fixed discount.
Example result
Final price with tax: $80.00
Price before tax: $80.00
Savings before tax: $20.00
These are illustrative inputs. Change the values to explore a different scenario.
Formula references
- Investor.gov: financial tools (opens in a new tab)
- OpenStax: discounts, markups and sales tax (opens in a new tab)
References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.
Common questions
Do discounts of 20% and then 10% equal 30% off?
No. Each percentage acts on the current price, so a $100 item falls to $80 and then $72, for a 28% combined reduction.
Can I recover an original price from the sale price?
Use the known-pair mode with final price and percent off. A zero final price at 100% off cannot identify one original price.
Prepared by Finflo. See our methodology and editorial policy. Read the relevant professional-advice limitations.