Shopping and pricing
Discount, percent off to sale price.
Pick what you want to find. Optionally add a sales tax rate to see the total at the till.
Sale price = original price x (1 - discount %). Savings = original - sale. 25% off $80.00 is a $60.00 sale price and $20.00 saved.
Your numbers
Result
Worked example
A jacket is $80.00 and the sign says 25% off. Savings are $80.00 x 0.25 = $20.00, so the sale price is $60.00. In reverse, a $60.00 sale price on an $80.00 original is (80 - 60) / 80 = 25% off. And if you only know the $60.00 sale price and the 25% discount, the original was 60 / 0.75 = $80.00.
How it works
A discount is a percentage of the original price. The sale price is what remains: original x (1 - discount). To find the original from a sale price, divide by (1 - discount), which is why 100% off cannot be reversed. The optional tax rate is whatever you enter, applied to the sale price; check your local rules on whether tax is charged before or after a store coupon. For several discounts in a row see the discount stacking calculator. This is arithmetic on your inputs only, with no outside data.
Sources and basis (retrieved 2026-10): arithmetic on your inputs using the standard textbook definitions of markup (profit / cost) and gross margin (profit / price). No outside data or third-party figures are used.
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Quick reference table
| Percent off | Sale price on $100 | You save | Increase needed to get back to $100 |
|---|---|---|---|
| 5% | $95.00 | $5.00 | 5.26% |
| 10% | $90.00 | $10.00 | 11.11% |
| 15% | $85.00 | $15.00 | 17.65% |
| 20% | $80.00 | $20.00 | 25.00% |
| 25% | $75.00 | $25.00 | 33.33% |
| 30% | $70.00 | $30.00 | 42.86% |
| 40% | $60.00 | $40.00 | 66.67% |
| 50% | $50.00 | $50.00 | 100.00% |
| 60% | $40.00 | $60.00 | 150.00% |
| 75% | $25.00 | $75.00 | 300.00% |
Common mistakes
- Subtracting the percentage from the price as if it were dollars. 25% off $80 is $20 off, not $25 off.
- Reversing a discount by adding the same percentage back. After 25% off, you need a 33.33% increase to return to the original price.
- Adding two discounts together. 20% off then 10% off is 28% off in total, not 30%.
- Comparing the percent off on different original prices. A smaller percentage off a lower original price can cost less in dollars.
FAQ
How do you calculate a discount?
Multiply the original price by the discount as a decimal to get the savings, then subtract it from the original. 30% off $50 is $15 saved and a $35 sale price.
How do I find the percent off from two prices?
Subtract the sale price from the original, divide by the original and multiply by 100. $80 down to $60 is 20 / 80 = 25% off.
How do I find the original price before a discount?
Divide the sale price by 1 minus the discount as a decimal. A $60 sale price after 25% off is 60 / 0.75 = $80.
Is 20% off then 10% off the same as 30% off?
No. The second discount applies to the reduced price, so the total is 28%. Use the discount stacking calculator for several discounts in a row.