Discount Calculator

Enter the original price and the discount percentage. The calculator immediately shows your savings, sale price, and effective discount. For a simple 25% off $80, you see $60 with $20 in savings.

Stacked discounts (a coupon on top of a sale): toggle the "Stack a second discount" option and enter the second percentage. The calculator applies the second discount to the already-reduced price, then shows you the step-by-step math. This is how most "extra 10% off sale items" coupons actually work — they are not added to the original discount.

Sales tax: toggle on "Add sales tax" to apply a tax rate to the post-discount price. Sales tax is typically calculated on what you actually pay, not on the original price. If you do not know your local rate, use our Sales Tax Calculator first.

The effective discount percentage in the result panel is the true total reduction from the original price — important for comparing stacked-discount deals to flat percentage-off offers.

The discount amount is the dollars you save. The sale price is what you pay (before any tax). The effective discount percentage tells you the true total reduction from the original price.

Stacked discounts always produce a smaller total reduction than the simple sum of percentages suggests. The math: 20% off + extra 10% off = 1 − (1 − 0.20)(1 − 0.10) = 1 − 0.72 = 28% off. The reason: the second discount applies to the smaller, already-reduced price, so 10% of $80 ($8) is less than 10% of $100 ($10).

Retailers and credit-card cashback programs use stacking to make discounts sound bigger than they are. "Buy one, get one 50% off" sounds like a great deal — but it is only a 25% discount on two items, smaller than a flat 30% off everything.

On the seller side: discounts compound fast against your margin. If you have a 50% gross margin and offer 25% off, your margin drops to 33% — losing one third of your gross profit per sale. At 40% off, you are down to 17% gross margin, and at 50% off you are breaking even before operating costs. Plan promotional pricing carefully against your true margin.

Sales tax on discounted items: in most US jurisdictions, tax applies to what you actually pay (the post-discount price). Exception: some states tax the pre-discount price when the coupon is reimbursed by the manufacturer rather than the retailer. This is rare and primarily relevant in CPG (cereal coupons, etc.).

For programmatic discount pages, we also have dedicated calculators for the most-searched percentages: 10% off, 15% off, 20% off, 25% off, 30% off, 40% off, 50% off, and 75% off. They are coming in Phase 2 of this site.