Discount Calculator
Calculate the new price and how much you save when a discount percentage is taken off.
How to use the discount calculator
- Enter the original price of the item.
- Enter the discount percentage — the calculator shows the new price and how much you save.
How the discount is calculated
The calculator first finds how much the discount is worth, then subtracts this from the original price:
New price = Original price − You save
If an item originally costs 1,200 and has a 25 % discount, you save 1,200 × 0.25 = 300, and the new price becomes 1,200 − 300 = 900.
Two successive discounts do not add up
Twenty percent off followed by a further twenty percent is not forty percent, but thirty-six. The reason is that the second discount is calculated from the already reduced price, not from the original. On an item at 1,000, that gives 800 after the first reduction and 640 after the second — against 600 if the discounts really had amounted to forty percent combined.
The effect always favours the seller, and the gap widens with the size of the discounts. Fifty percent twice gives a seventy-five percent reduction, not a hundred — obvious on reflection, but not when the sign says «50 % + an extra 50 %». The order makes no difference, however: the result is the same whichever discount is applied first.
Frequently asked questions
How do I calculate the total discount with several discounts in a row?
Discounts applied one after another (e.g. 20 % then 10 %) don't simply add up to 30 %. Calculate the first discount, then use the new price as the starting point for the next discount in the calculator.
How do I find the discount percentage if I know the new and old price?
Use the Percentage Calculator's "% change" tab — it shows the percentage decrease between two prices.