You pay
$90.00
was $120.00
You save
$30.00
25% off the original
You pay
75%
of the original price
Discount amount
$30.00
the first 25% off
Price per $100
$75.00
a quick way to compare deals
How the Discount Calculator Works
The formula
The amount you save is the original price times the discount: saved = original × (percent ÷ 100), and the sale price is the original minus that. The shortcut worth remembering is that the final price is original × (1 − percent ÷ 100) — so 25% off means you pay 75%.
Stacked discounts multiply
This is where shops quietly win. An extra 10% off an item already reduced by 20% is not 30% off. The second discount applies to the reduced price, so you get 0.8 × 0.9 = 0.72 — a 28% discount. The gap widens as the numbers grow: 50% and then another 50% is 75% off, not free. Enter a second discount above and the breakdown shows each step.
Judging whether a deal is good
A percentage is only as meaningful as the price it is taken from. A headline 70% off an inflated "was" price can be worth less than 20% off a genuine one, so compare the final price against what the item normally sells for elsewhere rather than trusting the discount on the label.
Frequently asked questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage divided by 100 to get the amount you save, then subtract that from the original price. For example, 30% off $80 is $80 × 0.30 = $24 saved, leaving a final price of $56. A shortcut: the final price is the original × (1 − percent ÷ 100).
How do two stacked discounts work?
Stacked discounts multiply, they do not add. An extra 10% off an item already reduced by 20% is not 30% off — it is 0.8 × 0.9 = 0.72, so 28% off. The second discount applies to the already-reduced price, which is always smaller than the original.
How do I find the percentage off from two prices?
Subtract the sale price from the original, divide by the original, and multiply by 100: percent off = (original − sale) ÷ original × 100. An item down from $50 to $35 is (50 − 35) ÷ 50 × 100 = 30% off.
Is the discount applied before or after tax?
Discounts are normally applied to the pre-tax price, with sales tax or VAT then calculated on the reduced amount — so a discount also reduces the tax you pay. This calculator works with pre-tax figures; add tax to the final price shown if you need the amount at the till.
What does a discount of 50% off really save?
Exactly half the original price. It is worth checking the original against the usual selling price though: a large advertised discount from an inflated 'was' price can be worth less than a smaller discount from a genuine one.