Discount Calculator
Work out a sale price, the amount you save and the real percentage off — including stacked discounts and tax.
- Final price
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- You save
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- Discount
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- Price after discount
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Breakdown
How it works
Type the original price and the discount — the sale price, the money you save and the effective discount percentage update as you type. To calculate a 20% discount the tool multiplies the price by 0.80, so €100 minus 20% is €80.00 and you save €20.00. Switch the mode to Fixed amount off when the shop advertises "$15 off", or to Discount % from original and sale price to work backwards and find out what percentage off a sale price really is — handy for checking whether a "half price" tag is honest.
Two discounts can be stacked: enter the first percentage and an extra percentage, and they are applied one after the other the way shops actually do it (20% then an extra 10% is 28% off in total, not 30%). The optional tax / VAT field is added after the discount, which is how sales tax is normally charged. Every number is calculated in your browser with plain JavaScript — no ads, no sign-up, no data sent anywhere — and Copy or Download gives you the full breakdown as plain text.
Frequently asked questions
How do I calculate a 20% discount?
Multiply the original price by 0.80 — that is 100% minus the 20% discount. A $100 item at 20% off costs $80.00 and you save $20.00. Enter the price and 20 in the Discount % field and this calculator does it as you type, including the amount saved.
How do I work out what percentage off a sale price is?
Subtract the sale price from the original price, divide by the original price and multiply by 100. Switch the mode to "Discount % from original and sale price", enter both figures, and the effective percentage off appears instantly — $175 down from $250 is 30% off.
Can I stack two discounts, like 20% off plus an extra 10%?
Yes. Enter the first percentage and then the extra percentage in the stacked field. Discounts are applied one after the other the way shops actually do it, so 20% then an extra 10% is 28% off in total, not 30% — the calculator shows the true combined discount.