Free discount calculator
Find the amount you save, the sale price, or the discount percentage from two prices. You can also work backward to estimate an original price.
A discount calculator applies a percentage or fixed amount to a price. For example, 20% off $100 saves $20, so the sale price is $80.
Choose one of three calculations and enter your numbers. Results update when the inputs are valid and are formatted in your selected currency.
Calculator
The selected currency controls formatting only. No currency conversion is performed.
The calculator uses the original price as the base for percentage discounts. It shows the discount amount separately from the price left to pay.
Discount Amount = Original Price × Discount Percentage ÷ 100
For $100 at 20% off, $100 × 20 ÷ 100 = $20 savings.
Sale Price = Original Price − Discount Amount
Subtract the $20 savings from $100 to get a sale price of $80.
Discount Percentage = ((Original Price − Sale Price) ÷ Original Price) × 100
If a price falls from $100 to $80, the $20 savings is 20% of the original price.
Original Price = Sale Price ÷ (1 − Discount Percentage ÷ 100)
$80 after a 20% discount means $80 ÷ 0.80 = $100 originally.
Reversing a discount is different from subtracting the same percentage from an increased price. The percentage uses a different base: $100 increased by 20% becomes $120, and then a 20% decrease from $120 gives $96. To reverse the increase, divide $120 by 1.20 to return to $100.
These examples show each formula with straightforward prices and amounts.
Discount amount = $100 × 20 ÷ 100 = $20
Sale price = $100 − $20 = $80
Fixed discount = $15
Sale price = $60 − $15 = $45
Savings = $100 − $80 = $20
Discount percentage = $20 ÷ $100 × 100 = 20%
Sale price = $80; discount = 20%
Original price = $80 ÷ (1 − 0.20) = $100
Quick answers about discount amounts, sale prices, and the calculations above.
Multiply the original price by the discount percentage and divide by 100. For example, 20% of $100 is $20 in savings.
Subtract the discount amount from the original price. A $20 discount on $100 gives a sale price of $80.
Subtract the sale price from the original price, divide the savings by the original price, then multiply by 100. For example, saving $20 on a $100 item is a 20% discount.
Divide the sale price by one minus the discount rate as a decimal. For example, $80 after a 20% discount means $80 ÷ 0.80 = $100 original price.
Yes. A 100% discount reduces the sale price to zero. You cannot reverse a 100% discount to find a unique original price because every original amount would become zero.
Yes. In Calculate sale price mode, choose Fixed amount and enter the amount to subtract. It cannot be greater than the original price.
No. This calculator shows the price after a discount before sales tax and other charges. Tax rules and rates vary; use the applicable rate separately.
No. Currency selection changes the currency formatting only. The amount is not converted and no exchange rate is applied.
This calculator applies the entered discount directly to the entered original price. It does not include tax, shipping, other offers, or retailer-specific terms. The displayed result is a mathematical estimate; final prices can depend on how a seller applies discounts and rounds amounts.