Discount Calculator
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Find the sale price and savings from any discount percentage. Supports stacked discounts and tax calculations.
Discount Calculator
You Pay
$0
About This Tool
What This Tool Does
Enter the original price and discount percentage, and instantly see the final price and how much you save. Optionally stack a second discount or add sales tax to see the true checkout total.Stacked Discount Math
Stacked discounts do not add up the way most people expect. A 20% discount followed by another 10% discount is not 30% off — it's 28% off, because the second discount applies to the already-reduced price.final = original × (1 − d1) × (1 − d2)Real-World Tips
Always check whether tax is computed before or after the discount — in most jurisdictions, tax is on the post-discount price, but some regions (and some membership warehouses) calculate it differently.Frequently Asked Questions
Why isn't '20% off + extra 10%' the same as 30% off?
Because the second discount applies to the already-reduced price. 20% off $100 = $80. Another 10% off $80 = $72. That's only 28% off the original — not 30%.
Is the tax always calculated after discounts?
In most US states and many countries, yes — tax applies to the actual amount you pay after discounts. A few places calculate tax on the original price. Check your local rules if it matters.
Can I use this for buy-one-get-one (BOGO) offers?
BOGO offers are effectively a 50% discount on the second item. If both items are the same price, the total is a 25% discount on the pair. For mixed-price BOGO, use the price of the more expensive item as 'original' and the cheaper as 'free'.