Why you might need a discount calculator
During sales seasons and promotions, it can be hard to quickly tell whether a discounted price is actually worth it, especially with an odd percentage like 35% or when multiple discounts stack on top of each other. A discount calculator gives you the final price and how much you're saving instantly, without doing the math in your head.
How the discount amount is calculated
Calculating a discount relies on a simple formula: discount amount = original price × discount percentage ÷ 100, and final price = original price − discount amount. For example, if the original price is 500 and the discount is 20%, the discount amount = 500 × 20 ÷ 100 = 100, and the final price = 500 − 100 = 400. The tool calculates both instantly, and can also work out the original percentage if you only have the price before and after the discount.
Steps to use it
Follow these steps to get the result instantly:
Open the discount calculator
Open the tool directly from the calculators page.
Enter the original price
Enter the price before the discount.
Enter the discount percentage
Enter the advertised discount percentage.
Review the result
You'll see the final price and your savings instantly.
Practical Tips Before You Start
Before you start, keep these points in mind:
- If there's more than one discount on the same product (like a 20% discount on top of a 10% discount), the two discounts don't simply add up — you need to calculate each discount on the price resulting from the one before it.
- Always compare the final discounted price with prices of similar products, to make sure the discount is genuinely worthwhile.
- Watch out for stores that raise the original price first before announcing the discount, to make the markdown look bigger than it really is.
- You can also use the tool in reverse if you want to find the discount percentage from just the original and final prices.
Your privacy is fully protected; none of the data you enter is saved or stored.
Common use cases
- Knowing the real final price before buying during sales promotions.
- Comparing different discount offers on the same product from different stores.
- Calculating total savings from multiple purchases on the same receipt.
- Finding the actual discount percentage from two known prices, before and after the markdown.
Why choose Fastols?
Accurate, instant calculation
The final price and your savings in a single second
No data storage
Numbers are processed inside your browser and nothing is stored with us
Completely free
Unlimited use with no hidden fees
Instant result with full accuracy
100% accurate math with no rounding errors
Frequently Asked Questions
Does the tool calculate two consecutive discounts on the same product?
The tool calculates one discount at a time; if there are two consecutive discounts, calculate the first one normally, then use the resulting price as the original price to calculate the second discount.
Can I calculate the discount percentage if I only have the price before and after?
Yes, you can enter both prices and the tool will automatically calculate the actual discount percentage between them.
Does the result include added tax?
No, the tool only calculates the discount on the price you enter; if there's added tax, you need to add it after calculating the final discounted price.
Is the tool free and without sign-up?
Yes, you can use it for free without creating an account.
Why aren't two discounts of 20% and 10% the same as 30%?
Because each discount is calculated on the price resulting from the previous discount, not on the original price, so the final result ends up slightly less than simply adding the two percentages together.
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