Discount Calculator

The discount calculator works out the price after a discount and the amount you save. Enter the item price and the discount percentage – the result appears instantly. Three modes: a simple discount, a reverse calculation (restore the price before the discount from the final price), and "discount on discount" for when a store applies two discounts in a row. All calculations happen on your device.

How to use the calculator

"Discount" mode: enter the price and the percentage off. The result panel shows the final price in large type plus a "you save" line with the amount and the percentage. The percentage slider is handy for browsing: drag it and you immediately see what the item costs at 10, 20 or 30% off. "Price before discount" mode works the other way round: enter the price the store shows and the discount – the calculator restores the original price so you can see the real saving. "Discount on discount" mode calculates a chain of discounts: the first is applied, then the second – to the already reduced price.

How the discount is calculated

The discount is always taken from the item price, never from the already discounted price. The formula is simple: savings = price × percent ÷ 100, final price = price − savings. Example: an $80 item with 25% off – savings $20, final price $60. The reverse calculation uses price before discount = final ÷ (1 − percent ÷ 100): if the price is $60 after a 25% discount, the original was $60 ÷ 0.75 = $80. You cannot just add the percentage back to the final price – that gives the wrong number.

Why two discounts do not add up

When a store says "−20% and an extra −10%", many people expect a total of 30%, but that is not how it works. The second discount applies to the price already reduced by the first: $80 − 20% = $64, then $64 − 10% = $57.60. The total saving is $22.40, an effective discount of 28%, not 30%. The gap seems small, but on expensive purchases it is real: on a $2,000 item "−30%" would save $600, while the actual −28% saves $560. The calculator shows the effective percentage so you see the true benefit.

What to watch for during sales

A discount from a price that never existed is a classic marketing trick: the store keeps an inflated "old" price for a month and then "cuts" it back to the usual level. So compare the final price with prices at other stores, not with the size of the advertised discount. Read the fine print: the discount may not apply to part of the range, may not combine with a promo code, or may work only when you buy two items. And remember returns: if you change your mind, you get back what you actually paid, not the "old" price.

This calculator is for information only. The terms of discounts are set by the seller and stated in the store's offer.