Calculators
Discount Calculator
Compute the final sale price after one or two stacked percentage discounts, showing the total saved at every step.
Maths run locally in your browser.
Stacked Discounts Never Add Up — That Is the Point
A "30% + extra 20% off" is not 50% off: the second percentage applies to the already-reduced price, so it is 30% off, then 20% of the remaining 70% — a total of 44% off. Retailers rely on this asymmetry. The same math, in your favor, applies to successive price drops when deciding whether to buy now or wait.
The Formula Behind the Result
- Enter the original price and the first discount percentage.
- Optionally add a second stacked discount (like "extra 20% off the sale price").
- The result shows the final price, the amount saved per discount, and the combined effective discount.
- All math is displayed so you can check it against the store’s till.
Worked Example
Common Questions
Why is 30% + 20% not 50% off?
The second discount applies to the already-reduced price, so the effects multiply (0.7 × 0.8 = 0.56 → 44% total).
Does this include sales tax?
No. Discounts here apply to the pre-tax price. Apply your local tax rate to the final figure if you need the out-the-door price.
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