Discount Calculator — Calculate Sale Prices
Our free discount calculator shows you exactly how much you save on sale items. Enter the original price and discount percentage to instantly see the discounted amount and final sale price. For stacked promotions, use the double discount feature to apply two consecutive discounts. Need to find the original price before a discount was applied? Our reverse calculator works backwards from the sale price and discount percentage to reveal the original price.
The double-discount mode exists because stacked promotions do not add up the way shoppers assume. An extra 20% off an item already reduced by 30% is not 50% off — it is 44%, because the second discount applies to the already-reduced price. That difference is worth real money on a large purchase, and it is the reason retailers advertise stacked percentages rather than a single one. The reverse mode works the other way, recovering the original price from a sale tag so you can check whether the advertised saving is genuine.
How to use Discount Calculator
- Enter the original price and discount percentage.
- See the savings amount and final price instantly.
- Use "Double Discount" to apply two consecutive discounts.
- Use "Find Original Price" to reverse-calculate from a sale price.
Features
- Basic discount calculator — Enter price and percentage to see final price and savings.
- Double/stacked discount — Apply two consecutive discounts correctly.
- Reverse calculator — Find the original price from a sale price and discount.
- Tax calculator — Add sales tax to the discounted price.
- Shows savings amount and percentage — See exactly how much you save.
- Real-time results — Instant calculation as you type.
Frequently Asked Questions
How do I calculate a percentage discount on a price?
Multiply the original price by the discount percentage divided by 100, then subtract from the original price. For example, 25% off $80: discount = $80 × 0.25 = $20, final price = $80 - $20 = $60. Our calculator does this instantly.
How do double discounts work?
The second discount applies to the already-reduced price, not the original. So 30% off + 20% off is NOT 50% off. Our calculator correctly applies sequential discounts and shows the true total savings percentage.
How do I find the original price before a discount?
Use the formula: Original Price = Sale Price / (1 - Discount%). For example, if an item costs $60 after 25% off: $60 / 0.75 = $80 original price. Enter the sale price and discount in our reverse calculator.
Why is 30% off plus 20% off not 50% off?
Because the second discount is applied to the already-discounted price, not to the original. On a 100 item, 30% off gives 70, and 20% off that gives 56 — a total saving of 44%, not 50%. Discounts multiply rather than add, which always works out in the retailer's favour.
How can I tell if a sale price is a real discount?
Use the reverse mode to recover the implied original price from the sale price and the advertised percentage, then compare that against what the item actually sold for before. If the recovered original is higher than the historical price, the reference price was inflated ahead of the sale, which is a common tactic and illegal in several jurisdictions.