Discount Calculator
Calculate sale price, discount amount, and total savings from any percentage off. Optionally add sales tax to get the final checkout price.
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Frequently asked questions
How do I calculate percentage off?
Multiply the original price by the discount percentage divided by 100 to get the discount amount, then subtract. Example: 30% off $85 -> discount = $85 x 0.30 = $25.50 -> sale price = $85 - $25.50 = $59.50. Shortcut: multiply by the remaining percentage (70% of $85 = $59.50).
How do stacking discounts work?
When two discounts stack (20% off then an extra 10% off), apply them sequentially, not additively. A 20% + 10% stack is NOT 30% off. Example: $100 - 20% = $80, then $80 - 10% = $72. The combined saving is 28%, not 30%. This is why retailers advertise 'extra 10% off sale prices' rather than '30% off.'
Is the price shown before or after tax?
In the US, retail prices are displayed before sales tax. Sales tax is added at checkout and varies by state and product category. Use the Sales Tax % field to include your local rate. State-only rates range from 0% (Oregon, Montana, Delaware) to 9.55% (Tennessee), but combined state + local rates can exceed 11%.