Discount Calculator
Sale price, amount saved and the effective percentage off, including stacked discounts.
Discount Calculator for Sale Prices and Stacked Offers
A single discount is easy arithmetic. Stacked offers are where shoppers get caught out: "30% off, plus an extra 20% at the checkout" is not 50% off. The second discount applies to the already-reduced price, so the true saving is 44%.
This calculator shows the final price, the cash saved and the effective percentage off, with each step broken out so you can see exactly where the number comes from. Add a tax or VAT rate to get the amount you will actually be charged.
Key features
- Stacked discounts handled correctly — sequential, not additive, with the true effective rate shown.
- Tax and VAT — applied after discounts to give the real checkout total.
- Step-by-step working — every intermediate price is shown, not just the final answer.
- Cash saving and percentage — both, because they persuade differently.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: Discount Calculator
- Enter the original price
Use the pre-discount ticket price. - Enter the discount percentage
The final price and total saving appear immediately. - Add a second discount if one applies
The tool applies it to the already-reduced price and reports the genuine effective percentage. - Add tax if you need the checkout figure
Tax is applied last, after all discounts, which is how almost every retailer calculates it.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Calculators |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Is 30% off plus 20% off the same as 50% off?
No — it is 44% off. The second discount applies to the already-reduced price: £100 becomes £70, then £70 × 0.8 = £56. You save £44, not £50. Retailers rely on this being misread.
How do I find the original price from a sale price?
Divide the sale price by (1 − discount/100). An item at £45 after 40% off was £45 ÷ 0.6 = £75. Adding 40% to £45 gives £63, which is wrong.
Should tax be applied before or after the discount?
After, in virtually every jurisdiction — tax is charged on the amount actually paid. This calculator applies it last for that reason.
What is the difference between margin and markup?
Markup is profit as a percentage of cost; margin is profit as a percentage of selling price. A 50% markup on a £10 cost gives a £15 price, which is a 33% margin — the same money, two different percentages.