Discount Calculator
Discount calculator: sale price after a percent off, the original price, or the discount percentage, plus how much you save.
Pfinal = P · (1 − d)
How to use this calculator
- Choose the quantity you want under “Solve for”.
- Type the known values and pick their units: any combination works.
- The result updates as you type. Open “Show the steps” to see the substitution.
Find the final price after a percentage discount, the original price before a sale, or what percentage off you are actually getting.
For two stacked discounts, apply them one after the other: 20 % then 10 % off is a 28 % total discount, not 30 %.
Results are estimates for information only and do not constitute financial advice. Your lender’s or bank’s figures may differ.
Formula
Pfinal = P · (1 − d)
| Symbol | Quantity | Units |
|---|---|---|
| P | Original price | $, €, £ |
| d | Discount | %, × |
| Pfinal | Sale price | $, €, £ |
Worked example
Given: P = 80.00 $ · d = 25 %
Pfinal = P · (1 − d)
Result: Pfinal = 60.00 $
Sale price for different values of Original price
| P · Original price | Pfinal · Sale price |
|---|---|
| 40.00 $ | 30.00 $ |
| 60.00 $ | 45.00 $ |
| 72.00 $ | 54.00 $ |
| 80.00 $ | 60.00 $ |
| 88.00 $ | 66.00 $ |
| 100.00 $ | 75.00 $ |
| 120.00 $ | 90.00 $ |
| 160.00 $ | 120.00 $ |
Other values as in the worked example.
Frequently asked questions
What is 25 % off $80?
$80 × (1 − 0.25) = $60; you save $20.
How do I find the discount percentage?
d = 1 − sale price ÷ original price. From $50 to $40: 1 − 0.8 = 20 % off.
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