See what you will actually pay in a sale and how much you save. Enter the original price and the percent off — this discount calculator shows the final sale price and your saving. There is also a second calculator to find the percent off when you already know both prices.
About this discount calculator
This free discount calculator answers the two questions shoppers ask most. The first calculator takes an original price and a percent off and shows the final sale price plus exactly how much you save — handy for sales, coupons and clearance tags. The second works the other way round: enter the original price and the price you actually paid and it tells you the percentage discount, so you can check whether a "big sale" is really a bargain. It works with any currency because it only deals in numbers, and everything is calculated in your browser so nothing is sent anywhere.
Frequently asked questions
- How do I calculate a discount?
- Multiply the price by the percent off to get the saving, then subtract — 25% off $80 saves $20, so you pay $60.
- How do I find the percentage off?
- Use the second calculator — enter both prices and it shows the percent discount (e.g. $80 → $60 is 25% off).
- Does it work for any currency?
- Yes — it only works with numbers, so the result holds for any currency.
Where retail discounts get confusing
Retail discounts are fundamentally based on proportional reduction rather than absolute subtraction. The underlying formula relies on treating the original cost as a base whole and applying the markdown rate as a decimal multiplier. To find the savings amount, you multiply the initial price by the decimal equivalent of the percentage off, which converts the rate into a direct fraction of the total. Subtracting that product from the starting price yields the final transaction amount. This proportional approach ensures that the markdown scales accurately regardless of how large or small the initial price happens to be.
The mathematical convention originates from standard commercial arithmetic where percentages represent parts per hundred. When a store advertises a tiered promotion, such as stacking multiple coupons, shoppers often fall into the trap of simply adding the percentages together. For example, applying a twenty percent promotion followed by another ten percent discount does not equal a thirty percent total reduction. Each successive reduction applies strictly to the newly adjusted subtotal rather than the original baseline. Misunderstanding this compounding effect routinely leads consumers to miscalculate their expected savings at the register.
Another common error occurs when consumers confuse percentage discounts with markup calculations used by merchants. While a discount measures the reduction downward from a retail ceiling, markup calculates an increase upward from a wholesale baseline. Because the denominator shifts between the starting point and the ending point, a fifty percent markdown does not simply reverse a fifty percent markup on the same base number. Recognizing this inverse asymmetry helps clarify why clearance items marked down by extreme percentages still retain profit for the retailer.