Discount Calculator
Calculate sale prices and savings quickly. Enter the original price and discount percentage to find the final price. Stack multiple discounts or add sales tax to see the complete picture.
Reviewed by the SparkCalc editorial team
How We Calculate This
Single discount: Final = Original × (1 - Discount%). Stacked: Final = Original × (1 - Discount1%) × (1 - Discount2%). Tax is applied after all discounts.
Sources: Legal Information Institute (Cornell Law) — 16 CFR Part 233, Guides Against Deceptive Pricing · Legal Information Institute (Cornell Law) — 16 CFR 233.1, Former price comparisons · Legal Information Institute (Cornell Law) — 16 CFR 233.2, Retail price comparisons
Frequently Asked Questions
How do stacked discounts work?
Stacked discounts are applied sequentially, not added together. A 30% off + 10% off doesn't equal 40% off. The second discount applies to the already-reduced price: $100 × 0.70 × 0.90 = $63 (37% total discount).
Should I calculate discount before or after tax?
Discounts are typically applied to the pre-tax price. Sales tax is then calculated on the discounted amount. This calculator follows that order.
Is 50% off twice the same as 100% off?
No! Two 50% discounts stack to 75% off: $100 × 0.50 × 0.50 = $25. You can never reach 100% with percentage discounts.
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