Discount Calculator
Final price after a discount, the percentage off, and deals like buy 1 get 1, second item 50% off, and X for Y.
A fast discount calculator that answers the two questions that matter most. What do I actually pay, and what is the real percentage off. Useful both for everyday shopping and for store owners planning a sale. It handles stacked discounts (one discount applied on top of another), comparing two different deals, and finding the discount percent when you only know the price before and after. Everything runs in your browser with nothing sent to any server, so you can check prices privately. The result shows the final price, the savings, and the effective discount percent when several discounts stack together.
How to use this tool
- 01Pick a calculationCalculate the price after a discount. Or find the discount percent from a final price. Or work out a deal.
- 02Enter the pricesOriginal price and a discount percent (or a final price for the reverse calculation).
- 03Read the resultSee the final price, the savings, and the effective discount percent.
When is this useful?
- Black Friday shoppingA product at $499 with 35% off. In two seconds the final price is $324.35, a saving of $174.65.
- A double discount in a saleA "20% off plus an extra 10% for members" deal. The effective discount is 28%, not 30%. The gap matters on expensive items.
- Planning a store saleYou run a store and want a $180 product to sell for $129. The tool tells you to advertise "28% off".
- Comparing prices between storesThe same product is $340 in one store and $289 in another. The difference is 15%. Worth the trip? Up to you.
- Buy 1 get 1, or 2 plus 1A "2 plus 1 free" deal equals 33% off per item. "3 plus 1" equals 25%. It helps you see when buying more is genuinely worth it.
- A quote for a clientYou offer a client 12% off a $4,200 package. The final price is $3,696, ready to drop straight into the quote.
Examples
- A shirt at $180 with 30% offIn the "Discount" tab, enter 180 and 30. Final price: $126. You saved $54.
- Price dropped from $499 to $349In the "Percent off" tab, enter 499 and 349. The discount: 30.06%.
- A "buy 1 get 1" deal on a $100 productYou get two products for $100, so each one costs $50. That equals 50% off.
- A discount on a discount. 20% plus 10%A product at $500. After 20% it drops to $400. After another 10% it drops to $360. That is 28% off in total, not 30%.
Tips for a better result
- Discounts do not add upIf you see "30% + 20%" that is not 50% off. In practice it is 44% (0.7 × 0.8 = 0.56). Always check before you decide.
- Check the original priceStores sometimes inflate the base price before a sale. Check the price history in a comparison tool before you rush to buy.
- A cart-wide discountIf a coupon applies its percentage to the whole cart, enter the cart total rather than each item separately. The result is the same.
- Add tax afterwardThe calculator works on the price you enter. If you also need to add sales tax or VAT on the discounted price, use a dedicated tax calculator after this one.
How a discount is calculated. The basics
A discount lowers the original price by a percentage. The formula: final price = original price × (1 - discount percent / 100). For example, $200 with 25% off: 200 × 0.75 = $150. The saving is $50. The reverse formula: discount percent = (1 - final price / original price) × 100. Both directions are useful, depending on whether you know the percent or only the prices.
Stacked discounts. How they really work
Many stores offer "20% + an extra 10% for members". The common mistake is to add the percentages, but that is wrong. Each discount is calculated on the price after the previous one. Example: a product at $1,000 with 30% + 10% off. After 30% it is $700. After another 10% it is $630. The total discount is 37%, not 40%. The gap grows as the price gets higher.
Buy 1 get 1, 2 plus 1, 3 plus 1. What the real percent is
Deals like "buy X get Y free" sound attractive, but it is easy to express them as a plain discount. • Buy 1 get 1 = 50% off per item • 2 plus 1 = 33.3% off per item • 3 plus 1 = 25% off per item • 4 plus 1 = 20% off per item Useful when deciding whether a deal is genuinely better than a straight discount elsewhere.
Privacy
All calculations run in your browser. No price, no product, and no data is sent to any server. There is no tracking of what you plan to buy. When you are done, everything is cleared as soon as you close the tab.
Frequently asked questions
How do I calculate a price after a discount?
Subtract the discount percent (as a decimal) from 1, then multiply by the original price. For example, 30% off $180: 180 × 0.7 = $126.
How do I work out the discount percent I got?
(original price − final price) / original price × 100. For example: 180 - 126 = 54. 54/180 = 30%.
Does the calculator account for tax?
No. The discount is calculated on the price you enter. If your listed prices already include sales tax or VAT, the discount applies to the tax-inclusive price. If you work in net prices, use a dedicated tax calculator before or after.
How do stacked discounts work?
Each discount is calculated on the price after the previous one, not on the original price. For example 20% + 10% becomes only 28%, not 30%. It is always worth calculating the effective discount.
Is the data saved?
No. The calculation happens only in your browser, with no server storage and no logs.
A "buy 1 get 1 free" deal equals what discount percent?
50% off per item. You get two products for the price of one, so each item costs half its original price.
What is the difference between discount percent and profit margin?
A discount percent is calculated on the selling price. A profit margin for a store owner is calculated on the cost. For example, a product that costs 100 and sells for 150 is a 50% markup, but a 33% discount off the price brings it back to cost.
If a store gives a $50 coupon on a $250 purchase, what percent is that?
50 divided by 250 times 100 = 20% off. The bigger the cart total, the smaller the percent. You can always check it with the calculator.
How do I calculate a buy 1 get 1 or "second item 50% off" deal?
In the "Deals" tab, pick the deal type, enter the unit price and quantity, and you get the total to pay, the savings, and the effective price per item. That lets you compare a deal against the regular price.
What is an "X for Y" deal?
For example "3 for 100": every three units cost 100. The calculator works out how many full groups there are and adds any remainder at the regular price to get the final total.