Discount Calculator
Calculate the sale price after a discount, find the discount amount saved, or work out what percentage discount was applied.
About the Discount Calculator
A discount calculator tells you the final price after a percentage is taken off, and how much you save. The sale price is the original price multiplied by one minus the discount rate. A 30% reduction on a 250 item costs 250 times 0.7, which is 175, saving you 75.
The most useful thing to understand is how stacked discounts work. Two successive discounts do not add together. Taking 20% off and then a further 10% off is not a 30% reduction: the first leaves 80% of the price and the second takes 10% of that remainder, so you pay 0.8 times 0.9, which is 72% of the original. The total saving is 28%.
You can also work backwards. If a shirt costs 45 after a 25% discount, the original price was 45 divided by 0.75, which is 60. This helps you check whether an advertised saving is genuine.
A laptop is listed at 900 with 15% off, and you have a voucher for a further 10% off the sale price. After the first discount you pay 765. The voucher takes 10% off that, so the final price is 688.50. Your total saving is 211.50, an effective discount of 23.5%.
Tips for best results
- Check whether a quoted price already includes tax before comparing offers.
- Compare the final price, not just the percentage: a bigger percentage on a cheap item can save less cash than a modest percentage on an expensive one.
How to use the Discount Calculator
Why use Toolseza for Discount Calculator?
Use this tool as often as you need with no paywalls, premium tiers, or hidden daily calculation quotas.
All calculations and file manipulations run inside your web browser. Your inputs are never sent to a cloud server.
Results update in real-time as you type or adjust settings, with instant one-click copy and export capabilities.
Works natively on smartphones, tablets, laptops, and desktop computers with zero installation or account creation.
Editorial Standards & Verification: All formulas, algorithms, and conversion factors implemented on Toolseza adhere to openly documented international standards (ISO, NIST, BIPM, W3C). Results are verified against benchmark reference datasets before publication.
Frequently Asked Questions
How do I calculate a discount?
Discount amount = Original price × (Discount % ÷ 100). Sale price = Original price − Discount amount.
What is 20% off £50?
20% of £50 = £10 discount, so the sale price is £40.
How do I find what percentage discount was applied?
Percentage off = ((Original price − Sale price) ÷ Original price) × 100.