Find the sale price
Multiply the original price by the discount rate to find the savings. At 25% off an $80 item, the discount is $20 and the sale price is $60. The tool rounds the sale subtotal to cents.
Discount Calculator
See what a sale really costs. Calculate the discount first, then add an optional tax rate to the sale price.
Discount Calculator
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How to use this calculator
Add tax after the discount
Enter a tax rate if you want an estimated checkout total. With a $60 sale price and 8.25% tax, tax is $4.95 and the total is $64.95. Tax is calculated on the rounded discounted subtotal.
Compare offers using the final price
Use the same original price for competing percentage offers. Shipping, fixed-dollar coupons, and other checkout fees are not included. A lower advertised percentage does not always imply a lower total when the starting prices differ.
Understand stacked discounts
Two discounts are usually applied one after the other. An $80 item reduced 25% becomes $60; another 10% off that is $54, not $52. For a second discount, enter the first sale price as the new original price. Actual store and tax rules may differ.
A LITTLE MORE CLARITY
Common questions
Does the tool find my local sales tax?
No. Enter the rate you want to use; the calculator does not determine local rates or whether an item is taxable.
Can I calculate 100% off?
Yes. A 100% discount reduces the sale subtotal to zero. Any fees outside this calculation are not included.
About this tool
Created by Marchelle Cook at Roof & Ratio. These calculations run in your browser; entered values are not uploaded or saved by the calculator. Report a calculation issue with an example so we can review it.
Guide updated October 23, 2026. Displayed decimal results may be rounded; exact fraction and integer results are identified in the answer.