About Discount Calculator
A discount reduces a price by a percentage of that price. This calculator applies the first discount, then the additional discount to the already reduced price, then adds tax: final = price × (1 − d1 ÷ 100) × (1 − d2 ÷ 100) × (1 + tax ÷ 100). Savings and the effective discount are measured before tax. Stacked discounts multiply and do not add, so 20% plus 10% is 28% off, not 30%.
How to use Discount Calculator
- Fill in "Original price", "Discount", "Additional discount" and "Tax after discount".
- The result appears below and updates as you type.
- Copy the result with the copy button, or download it as a file where that is offered.
Questions about Discount Calculator
Is 20% off plus an extra 10% off the same as 30% off?
No. The second discount applies to the reduced price. On a price of 100, 20% off leaves 80 and 10% off that leaves 72, an effective discount of 28%.
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