Shops present discounts in whatever way looks largest, so "30% off then an extra 20%" is not 50% off — it is 44%. This calculator gives the real sale price, the cash saved, and handles a second stacked discount so you can compare offers honestly.
The second discount applies to the already-reduced price, not the original. 30% then 20% leaves 0.7 × 0.8 = 0.56 of the price, which is a 44% discount.
Subtract the sale price from the original, divide by the original, and multiply by 100. The percentage calculator does this in one step.
No. Enter the pre-tax price for a pre-tax result, or the tax-inclusive price to get a tax-inclusive result. Use the sales tax calculator to add tax afterwards.
Halve the original price in your head. If the advertised price is meaningfully above that, the discount is being applied to an inflated reference price.
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