Discount and Sale Price Calculator
Automatically calculate a sale price, find the discount percentage from two prices, and correctly combine successive discounts.
This choice applies to every calculator; amounts are not converted.
Discount calculation
Choose what you want to calculate: price after discount, discount percentage, or successive discounts.
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How does this tool work?
This discount calculator determines a price after a reduction, the amount saved, the discount percentage from an original and final price, and the real effect of two successive discounts.
In price-after-discount mode, the calculator applies the percentage to the original price and calculates both savings and final price.
In reverse mode, it compares the original and final prices to find the actual discount percentage.
With successive discounts, the second discount applies to the already reduced price: 20% followed by 10% therefore equals an effective 28% discount, not 30%.
How to use this tool
Choose the mode
Select the calculation that matches your situation.
Enter the known values
Enter original price, discount, final price, or second reduction depending on the mode.
Read the result
Final price, savings and percentage are recalculated automatically.
Compare before deciding
Use the savings and final price to evaluate the offer accurately.
Discount calculation formulas
A percentage discount always applies to a defined price base.
Discount amount
Savings = Original price × Discount / 100
This is the amount deducted from the original price.
Price after discount
Final price = Original price × (1 − Discount / 100)
A 20% discount is equivalent to multiplying the original price by 0.80.
Find the percentage
Discount = (Original price − Final price) / Original price × 100
This formula finds the actual reduction between two prices.
For successive discounts, each reduction applies to the price obtained after the previous discount.
See the detailed explanationWhy do two discounts not simply add up?
The second reduction applies to an already reduced price, not the original price.
- −20% then −10% = −28% overall
- The second percentage uses a smaller base
Discount, margin and selling price
A promotion lowers the selling price and can significantly change the margin actually earned.
- Discounted price ≠ unchanged margin
- Check margin before a promotion
Use cases
Sales and promotions
Instantly calculate the final price of a discounted item.
Compare an offer
Find the real discount percentage between an old and a new price.
Combine two discounts
Correctly calculate promotions applied one after another.
Prepare a commercial price
Measure the impact of a discount on a selling price before applying it.
Examples
20% off €100
Savings: €20; final price: €80.
Input
€100 · 20% discountTwo successive discounts
Final price: €72; effective reduction: 28%.
Input
€100 · −20% then −10%Tips and best practices
- For a 30% discount, multiplying the price directly by 0.70 is often the quickest calculation.
- Do not simply add two percentages when they are applied successively.
- For a business, compare a commercial discount with the remaining margin after the reduction.
Sources and references
- Weisstein E.W., Percent (opens in a new tab), Wolfram MathWorldPage in English
Frequently asked questions
How do I calculate a 20% discount?
Multiply the original price by 0.20 to find the savings, then subtract them. You can also multiply the price directly by 0.80.
How do I find the discount percentage?
Subtract the final price from the original price, divide the difference by the original price, then multiply by 100.
Do discounts of 20% and 10% equal 30%?
No. The second discount applies to the already reduced price. A 20% discount followed by 10% gives an overall reduction of 28%.
Can a discount be 100%?
Yes. Mathematically, a 100% discount reduces the final price to zero.
Does a discount reduce margin?
Usually yes if costs remain unchanged, because the selling price falls while purchase or production cost does not.
How do I find the original price from the sale price?
Divide the sale price by 1 minus the discount as a decimal. An item shown at €60 after a 25% discount originally cost 60 ÷ 0.75 = €80. Adding 25% to €60 would give €75, which is wrong.
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