Discount Calculator
Calculate discounted prices with single or stacked discounts and tax.
Result
Fill in the fields above, then press Calculate.
The Discount Calculator helps you understand the true final price after applying discounts and taxes. It handles stacked discounts (where each discount applies to the already-reduced price) and shows the impact of tax timing (applied before or after discounts). Essential for comparing deals and understanding your actual savings.
Examples
Simple 25% Off
A $80 item at 25% off: $80 x (1 - 0.25) = $60. You save $20.
Stacked Discounts
A $100 item with 20% off then 10% off: $100 x 0.80 = $80, then $80 x 0.90 = $72. Total savings: $28 (28% effective discount, not 30%).
Frequently Asked Questions
Is 20% off plus 10% off the same as 30% off?
No. Stacked discounts are applied sequentially. 20% off then 10% off gives an effective discount of 28%, not 30%. The second discount applies to the already-reduced price.
Should tax be applied before or after discount?
In most US jurisdictions, sales tax is applied to the final sale price (after discount). However, some states or situations may differ. Check your local tax rules.
How do I calculate the original price from the sale price?
Divide the sale price by (1 - discount%). For example, if the sale price is $60 after 25% off: $60 / 0.75 = $80 original price.
Result
Your result appears here and follows you as you scroll.
Quick Tips
- •Stacked discounts do not simply add up. A 20% + 10% discount is 28%, not 30%.
- •Some stores apply tax before discounts, costing you more in taxes.
- •Compare the final price across stores, not just the discount percentage.