Discount Calculator
Final price, amount saved, and stacked discounts.
Discount Calculator gives the final price and the amount saved from a price and a percentage off, works backwards from a sale price to the discount rate, and handles stacked discounts — where 20% then a further 10% is not 30%. Sales tax can be layered on top. All local arithmetic.
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Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.
How to use Discount Calculator
- Enter the original price and the discount.
- Add a second discount or a tax rate if they apply.
- Read the final price, the saving and the effective rate.
Questions about Discount Calculator
Why is "20% off then 10% off" not 30% off?
The second discount applies to the already-reduced price. 100 → 80 → 72, an effective 28%. Stacked discounts always come out lower than their sum, which is why retailers like advertising them that way.
Does the order of discounts matter?
No, multiplication is commutative: 0.8 × 0.9 equals 0.9 × 0.8. The order only matters when one of them is a fixed amount rather than a percentage.
Discount before or after tax?
Almost everywhere, the discount applies to the pre-tax price and tax is charged on the reduced amount. The tool follows that order and lets you switch it if your jurisdiction differs.
Can I work out the discount rate from the old and new price?
Yes. Enter the original price and the price on the label, and the tool returns the percentage off along with the amount saved. That is the mode for shops that advertise a price rather than a rate.
Does it work offline while I am in a shop?
Yes. Everything is computed in the page, so once it has loaded it keeps working with no signal — which is the usual state of a supermarket aisle. Adding it to your home screen makes it open like an app.
Is Discount Calculator really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use Discount Calculator?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.