Free Discount Calculator
Enter the original price and discount percentage to calculate the final sale price and how much you save.
Discount Calculator
A discount calculator answers the question that actually matters when you're comparing deals: not just the percentage off, but the real dollar amount you save and the final price you'll actually pay.
What is a discount calculator, and how is the discount calculated?
It calculates how much money a percentage discount actually saves you and the final price after that discount is applied — the amount saved is the original price multiplied by the discount percentage (divided by 100), and the final price is the original price minus that amount. Doing this instantly online is mainly useful for comparing deals: two sales advertising different percentages off different original prices aren't directly comparable until you see the actual dollar amounts and final prices side by side.
How do you find the original price from a sale price, or the exact discount percentage that was applied?
To work backward from a sale price to the original: divide the sale price by (1 − discount rate) — for example, $80 ÷ 0.80 recovers a $100 original price for a 20% discount. To figure out what discount percentage was actually applied when you know both prices: divide the amount saved by the original price and multiply by 100.
Can you stack two discounts, or apply multiple discounts to the same purchase?
Not by simply adding the percentages together — two 20% discounts don't combine into 40% off. Instead, apply them one after another: run the original price through the calculator with the first discount to get an intermediate price, then run that result through again with the second discount's percentage, since each discount applies to a progressively smaller base.
Does this include sales tax, and what's the actual difference between the discount and the sale price?
No — this calculates the discount amount and the discounted price only; add tax separately afterward if it applies to your purchase. The discount is the amount or percentage removed from the original price; the sale price is what you actually pay after that discount has already been subtracted — two related but distinct numbers that are easy to mix up when a store's signage only shows one of them.
When did stores start advertising a fixed percentage off a price, instead of haggling?
The whole idea of a discount off a listed price only makes sense once there's a fixed price to discount from — and for most of retail history, there wasn't one. Prices were negotiated case by case through haggling until 1861, when Philadelphia merchant John Wanamaker opened a clothing store built on one radical principle: every item got a price tag with the exact price a customer would pay, no bargaining involved, a practice he framed as treating every customer equally rather than rewarding whoever haggled hardest. By 1876, when Wanamaker expanded into what's considered the first true American department store, fixed price tags had become standard practice — and that fixed, advertised price is exactly what a modern discount percentage is calculated against.
Is Discount Calculator free to use?
Yes. Discount Calculator is completely free, with no sign-up and no usage limits.
Do I need to install any software?
No. Discount Calculator runs directly in your web browser — nothing to download or install.
Is my data kept private?
Everything happens on your device. We never receive or store the file or text you enter into Discount Calculator.