Calculate sale prices, savings amounts, and final costs after single or stacked percentage discounts.
Type the full price of the item before the discount.
Type the discount percentage or fixed dollar amount off.
See the discounted price and total amount you save.
Enter an original price and either a single discount percentage or a sequence of percentage discounts. The calculator reports the reduced price and how much the buyer saves compared with the original amount. Stacked discounts are applied one after another to the remaining balance. They are not simply added together: a 20% discount followed by 10% leaves 72% of the original price, producing an effective discount of 28%, not 30%.
A concrete input and expected output from the current implementation.
Input
Original price: $80.00 Discounts: 25%, then 10%
Expected output
Final price: $54.00 Total savings: $26.00
The first discount reduces $80.00 to $60.00. The second removes 10% of $60.00, or $6.00, leaving $54.00; $80.00 minus $54.00 gives $26.00 in total savings.
For one discount, the entered percentage is divided by 100 and multiplied by the original price to find the savings. With original price P and discount d, savings equal P x d/100, while the sale price equals P x (1 - d/100). The two resulting amounts should add back to the original price.
Each stacked percentage applies to the price left by the preceding discount. For two discounts, the final price is P x (1 - d1/100) x (1 - d2/100). Additional discounts add more factors. Reordering percentage-only discounts leaves the same mathematical final price, although cent rounding at individual steps can sometimes affect a retailer's total.
No. A 30% discount followed by 20% does not equal 50% off. The first leaves 70% of the price, and the second leaves 80% of that remainder. Multiplying 0.70 by 0.80 leaves 56% of the original price, so the effective discount is 44%.
No, not from percentage-discount inputs alone. The result represents the original price after the specified percentage reductions. Sales tax, shipping charges, fees, and coupons such as $5 off require additional calculations. Their order can matter because a seller may apply them before or after discounts according to its own rules.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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