Discount Calculator
Find the final price after a discount and exactly how much you save.
How to use
- Enter the original price.
- Enter the discount percentage.
- See the sale price and your savings instantly.
How the Discount Calculator works
Calculates a sale price from a percentage off, shows the amount saved, and handles stacked discounts correctly.
The discount is the original price times the rate; the sale price is what remains. Stacked discounts multiply rather than add, because each applies to the already-reduced price.
sale = original × (1 − rate)
stacked: original × (1 − r₁) × (1 − r₂)
Worked example
$120 at 25% off is $90, saving $30. An extra 10% off that is $81 — a 32.5% total reduction, not 35%.
Things worth knowing
- Stacked discounts never add up. 20% then 20% is a 36% total reduction, because the second applies to the smaller amount.
- To find the original price from a sale price, divide rather than add the percentage back: $90 after 25% off is $90 / 0.75 = $120.
- 'Up to 70% off' usually applies to a small number of items. The headline rarely reflects the typical discount.
Frequently asked questions
How do I calculate a discount?
Multiply the price by the discount percent divided by 100, then subtract that from the original price.
How do I stack two discounts?
Apply them one after another — take the first percent off, then apply the second percent to the reduced price.
How do I work backwards to the original price?
Divide the sale price by 1 minus the discount rate. Adding the percentage back overshoots because it is applied to a smaller base.
Is 50% off then 50% off free?
No — it is 75% off. The second half applies to what remains after the first.