Discount Calculator
Find the sale price, the amount saved and the effective discount.
Applied to the already-reduced price.
1,874.25
You pay
624.75
You save
25%
Effective discount
About Discount Calculator
Discount maths is simple in principle and easy to get wrong in a shop, especially when offers stack or when tax is applied after the reduction.
This calculator handles all three directions - price after discount, discount from two prices, and stacked offers - and shows the amount you actually save.
How Discount Calculator works in your browser
A single discount multiplies the price by (1 − discount ÷ 100). Stacked offers multiply in turn, which is why 20% off followed by 10% off is 28% off overall rather than 30%. Working backwards, the effective discount is (original − final) ÷ original.
When a tax rate is entered it is applied after the discount, which is how most retail prices are actually calculated, and the tool shows the amount you really save alongside the final payable price.
When to use it
- Checking what a "20% off plus an extra 10%" sale actually comes to.
- Working out the real discount percentage from a before-and-after price tag.
- Comparing two offers in a shop without doing percentage arithmetic in your head.
Frequently asked questions
How do stacked discounts work?
They multiply rather than add. 20% off then a further 10% off is 28% off in total, not 30%.
Can I work backwards from the sale price?
Yes, enter the original and final price and the tool reports the effective discount percentage.
Is tax included?
Optionally. Add your tax rate and the tool shows the final amount payable after the discount is applied.