Discount Calculator
Pick from 4 calculation modes. Compute the final price after a discount, work backwards from a sale price, find the original from a sale + percent, or stack multiple discounts (e.g. 20% then 10%) and see the compound effect.
All calculations are done in your browser. Nothing is sent to a server.
How to use this discount calculator
- Choose the mode: Original+%, Original+Sale, Sale+%→Original, or Stacked discounts.
- Enter the relevant prices/percentages.
- For stacked: add up to 6 discount rates that apply successively.
- Review the original, total discount, effective % off and final price. Copy with one click.
Frequently asked questions
How does stacked discount work?
Discounts compound multiplicatively. 20% + 10% off is not 30% — it's 0.8 × 0.9 = 0.72, so 28% total off.
How do I calculate a 20% discount?
Multiply the original price by 0.20 to get the discount amount, then subtract from the original. €100 × 0.20 = €20 off, final price €80.
How do I find the original price from a sale price and discount %?
Use the 'Sale + % → Original' mode. Formula: original = sale / (1 − rate/100).
Are stacked discounts at the till the same as a single equivalent discount?
Mathematically yes, but the order matters for tax. Most EU jurisdictions apply VAT after all discounts, so 20% + 10% off €100 leaves €72 net, then VAT is added on that. In some US states tax is calculated on the original price — check your local rules.