Percentage Off Calculator
Enter an original price and a discount percentage to see the sale price and how much you save. Optionally add sales tax to see the total to pay.
| Original price | $ |
| Discount | % |
| Sales tax (optional) | % |
Result
Your result will appear here.
How it works
Multiply the original price by the discount percentage to get savings, subtract from the original price for the sale price. If tax applies to the discounted price (most places do), add it after discounting.
Formula
Savings = price × (discount% ÷ 100)
Sale price = price − savings
Total = sale price × (1 + tax% ÷ 100)
Worked example
$100 at 20% off saves $20, so the sale price is $80. At 8% tax on the discounted price, that's $6.40 tax for a total of $86.40.
Assumptions
Discount applies to the listed price before tax. Tax is calculated on the discounted amount (this matches most US sales tax rules). Enter 0 for tax if not needed.
Reading the result
Sometimes stores say 'up to X% off' - the calculator is for a single percentage off a single item price. Compare the final price including tax, not just the discount percentage.
For general information only. Local tax rules may vary.
How to use the Percentage Off Calculator
It takes a few seconds, and every figure is calculated in your browser.
- Enter the original price.
- Enter the discount percentage.
- Enter the sales tax (optional).
- Press Calculate — the result appears in the dark panel beside the form.
- Use Copy, CSV, Share or Print under the result if you want to keep it.
Percentage Off Calculator — frequently asked questions
What formula does the Percentage Off Calculator use?
Savings = price × (discount% ÷ 100) Sale price = price − savings Total = sale price × (1 + tax% ÷ 100)
How does the Percentage Off Calculator work?
Multiply the original price by the discount percentage to get savings, subtract from the original price for the sale price. If tax applies to the discounted price (most places do), add it after discounting.
What assumptions and limitations should I know about?
Discount applies to the listed price before tax. Tax is calculated on the discounted amount (this matches most US sales tax rules). Enter 0 for tax if not needed.
Can you walk through a worked example?
$100 at 20% off saves $20, so the sale price is $80. At 8% tax on the discounted price, that's $6.40 tax for a total of $86.40.
Last updated 10 November 2026 · Formula, worked example and assumptions are documented above, and every result is calculated in your browser.