See the final price after a percentage discount, how much you save, and stack a second discount or sales tax.
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How to use the Discount Calculator
- Enter the original price and the discount percentage.
- Optionally add a second discount (e.g. an extra 10% off coupon) and a sales tax rate.
- Read the final price and the total amount you save.
About this tool
Stores often advertise stacked discounts like “40% off, plus an extra 20% off at checkout”. Those don’t add up to 60% — the second discount applies to the already-reduced price, so the real saving is 52%. This calculator applies discounts in sequence, exactly as a checkout would, and then adds sales tax if you enter one.
Sale price = original × (1 − discount ÷ 100)
Frequently asked questions
How do I calculate 20% off a price?
Multiply the price by 0.8 (that is, 1 − 0.20). A $50 item at 20% off is $40.
Why isn’t 30% off plus 20% off the same as 50% off?
Because the second discount applies to the reduced price. $100 → 30% off → $70 → 20% off → $56, which is 44% off in total, not 50%.
Is tax applied before or after the discount?
After. Sales tax is charged on the amount you actually pay, which is the discounted price.