Discount Calculator
Is that deal actually a deal? Enter the price and discount to see the sale price, your savings — and the real total after tax.
Spotted a mistake or have an idea? — errors get fixed and credited publicly.
Last reviewed: July 20, 2026 · Formulas verified by automated tests before every release.
The formula
Savings = Price × Discount% ÷ 100 · Sale price = Price − Savings · Final = Sale × (1 + Tax% ÷ 100)
What stores won't emphasize
- "Up to 70% off" usually means one item at 70% and the rest at 10–20%. Calculate the specific item.
- Stacked discounts multiply: 30% + extra 20% = 44% total, not 50%.
- Anchored prices: a "was $199, now $99" deal is only good if $99 is a fair price today — the "was" may never have been real. Compare across stores, not against the tag.
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percent and divide by 100 — that is the amount you save. Subtract it from the original price to get the sale price: $80 at 25% off saves $20, so you pay $60.
How do stacked discounts work (extra % off sale price)?
They multiply, not add. 30% off plus an extra 20% off is not 50% — it is 44%: the second discount applies to the already-reduced price. Run the calculator twice to see the real final price.
Why does the calculator have a sales tax field?
In the US, listed prices usually exclude sales tax, and tax applies to the discounted price. Adding your local rate (e.g. 8.25%) shows what the register will actually charge.
Is 25% off the same as paying 75%?
Yes — sometimes flipping it makes mental math easier: 25% off $80 means paying 0.75 × 80 = $60.