Math & Everyday
Discount Calculator
Enter an original price and a discount percentage to see the final sale price and how much you save — with optional stacking of a second discount for clearance deals.
Quick answer: Stacked discounts apply one after another, not added: 50% then 20% off is 60% off the original price, not 70%.
How it works
1. Enter the original price and discount
Start with the item's original price and the discount percentage being offered. A 25%-off sale means you pay 75% of the original. The calculator works from these two inputs.
2. Compute the sale price
Multiply the original price by one minus the discount as a decimal. A $80 item at 25% off is 80 x (1 - 0.25), which equals $60. The amount you save is the original price minus this final price.
3. Stack or compare discounts
For stacked discounts, apply them in sequence rather than adding the percentages — 20% off then an extra 10% off is not 30% off, it is 28% off the original. The calculator shows the final price and total savings so you can compare deals accurately.
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage to get the savings, then subtract it from the original price for the sale price.
How do stacked discounts work?
Stacked discounts apply one after another, not added together. 50% then 20% off is 0.5 × 0.8 = 40% of the original price, not 30% off.
Does this include sales tax?
No — it shows the pre-tax sale price. Add your local sales tax to the result for the final checkout total.