Discount Calculator
Find sale price and how much you save.
100% private — runs in your browser, nothing is uploaded.
Final price
80.00
You save
20.00
Discount
20.00%
How to use the Discount Calculator
- 1Enter the price
Type the original price before any discount.
- 2Enter the discount
Type the percentage off.
- 3Add a second discount
Optionally add a stacked extra percentage.
- 4Read the result
See the final price, how much you save and the effective discount.
Examples
| Input | Output |
|---|---|
$100, 20% off | Save $20 → pay $80.00 |
$100, 20% then 10% | Pay $72.00 (28% effective) |
Free online discount calculator
This discount calculator instantly shows the sale price, how much you save and the effective discount for any price and percentage off. It even handles stacked discounts — like a coupon on top of a sale — which trip most people up.
The simple formula
Sale price = price × (1 − discount ÷ 100). For $100 at 20% off, that is 100 × 0.80 = $80, a saving of $20. To go the other way and find the original price from a sale price, divide by the same factor: $80 ÷ 0.80 = $100.
Why stacked discounts aren't just added
A common mistake is thinking “20% then 10%” equals 30% off. It does not. The second discount applies to the already-reduced price: $100 → $80 → $72, which is an effective 28%. This calculator applies them in order so you always get the true final price. It runs in your browser, so it is instant, private and works offline.
Frequently Asked Questions
How do I calculate a discount?
Multiply the price by the discount percentage to get the amount off, then subtract it. For example, 20% of $100 is $20, so the sale price is $80. This tool does it instantly and shows how much you save.
How do I calculate 20% off a price?
Enter the price and 20 as the discount. For $100, 20% off is a $20 saving and an $80 final price. Change the numbers to try any percentage.
How do stacked or double discounts work?
They apply one after another, not added together. A 20% then 10% discount on $100 gives $80, then $72 — an effective 28% off, not 30%. Use the optional Extra % field to calculate this correctly.
How do I find the original price from a sale price?
Divide the sale price by (1 minus the discount as a decimal). If an item is $80 after 20% off, the original was 80 ÷ 0.8 = $100.
Does it work with any currency?
Yes. The calculator only works with numbers, so the result applies to dollars, euros, pounds, taka or any currency — just read the figure in your own.
Is it private?
Yes. All calculations run in your browser. Nothing is uploaded, and the tool works offline.