Discount Calculator
Calculate a sale price, savings, effective discount, quantity total, stacked percent coupon, fixed coupon, and reverse original price.
What this discount calculator does
A discount calculator answers the practical shopping question: what will the item cost after a percent-off sale, coupon, or quantity purchase. This page keeps the arithmetic transparent and uses dollars for examples.
- Enter the original price before the sale.
- Enter the main discount percent.
- Add an optional percent coupon or fixed dollar coupon.
- Set a quantity to see the order total.
- Switch to reverse mode when you know the sale price and want the original price.
Discount formulas
finalPrice is the sale price, price is the original price, and d is the discount percent.
savings is the dollar amount saved, price is the original price, and finalPrice is the sale price.
finalPrice is the price after two percent discounts, price is the original price, d1 is the first discount, and d2 is the second discount.
effectiveDiscount is the combined percent reduction after sequential discounts.
originalPrice is the price before the sale, discountedPrice is the known sale price, and d is the discount percent.
Coupons, tax and advertised savings
The calculator treats coupons as arithmetic inputs. It does not verify whether a listed original price was a real market price, whether a sale claim is fair, or whether sales tax, shipping, minimum order rules, and exclusions change the checkout total.
| Input | How it is applied | What to check |
|---|---|---|
| Percent coupon | Applied to the already discounted price | Percentages do not simply add |
| Fixed coupon | Subtracted as a dollar amount | Store rules may require a minimum order |
| Quantity | Multiplies the per-item totals | Bulk pricing or per-item coupon limits can differ |
| Sales tax and shipping | Not included unless you add them manually | Checkout totals can be higher |
Frequently Asked Questions
Sources and References
- 16 CFR Part 233 - Guides Against Deceptive PricingElectronic Code of Federal Regulations
- Advertising and Marketing on the Internet: Rules of the RoadFederal Trade Commission
Calculations are based on the listed reference sources. Links open in a new tab.