Discount Calculator
Find the final price after a discount. Enter the original price and the percent off — add a second discount to see how stacked savings really work.
Example: with Original price $80 · Discount 25% · Extra discount 0% · Sales tax 0% → Final price: $60.00.
- You save$20.00
- Effective discount25.0%
- Price with tax$60.00
Computed by the calculator below using its default values. Change any input to see your own numbers.
Sale price vs savings
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Check it outWhy stacked discounts aren't additive
Two discounts don't simply add up. An extra 20% off an item already 25% off isn't 45% off — the second discount applies to the already-reduced price, giving a 40% effective discount. This calculator handles the stacking so you can see the true final price and savings.
How it’s calculated
Sale price = original × (1 − discount 1) × (1 − discount 2). Stacked discounts multiply, so they total less than their sum.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
A fixed-amount discount is subtracted before any extra percent discount is applied. Solving for the original price divides the known sale price by (1 − discount 1) × (1 − discount 2). The optional sales tax rate is applied only to the “Price with tax” row and never changes the pre-tax final price, savings, or effective discount.
Common mistakes
- Adding stacked discounts instead of multiplying them.
- Forgetting tax applies after the discount.
Frequently asked questions
Do 25% + 20% equal 45% off?
No — stacked discounts multiply, not add. 25% then 20% off is 40% off overall.
Is tax included?
The final price and savings are always pre-tax. Enter a sales tax rate above and the “Price with tax” row shows the tax-included total, or use our sales tax calculator separately.
How do I find the percent off from two prices?
Subtract the sale price from the original, divide by the original, and multiply by 100.