Percentage Off Calculator
Single percent-off — original price minus a discount, see the saving and the final price.
Calculator
100.00 × (1 − 20.00/100) = 80.00
How it works
The percentage-off calculator answers the most common shopping question: if something costs X and is Y percent off, what is the final price? It is the same arithmetic that cashiers and shopkeepers do dozens of times a day, but with two important differences. First, our calculator runs entirely in your browser — your numbers never leave your device, so you can use it for genuinely private purchases (a gift you don't want flagged in a search history, a transaction you'd rather not see in an analytics dashboard). Second, every calculation is encoded in the URL. Change the original price or the discount percent and the URL updates instantly, so you can copy the link and share the exact same calculation with a friend, a co-worker, or your future self. The math is straightforward — saving equals original price multiplied by discount percent divided by one hundred; final price equals original price minus saving — but the experience is what we obsess over. Type, see the result, share the link. No popups, no cookie consent, no email gate, no signup wall. If you want to verify the formula yourself, we list the source on the FAQ below. If you want to bookmark a few common calculations for repeat use, just save the link with the values pre-filled. And if you spot a corner case where our result disagrees with a register or a calculator you trust more, tell us — we publish corrections within 24 hours.
Why use this calculator?
- Private. Numbers stay in your browser. We never log inputs and we don't run third-party trackers.
- Shareable. Every calculation is encoded in the URL. Copy the link and the recipient sees the same result.
- Instant. Result updates as you type — no submit button, no page reload.
- Works without JavaScript. Disable JS and the form still submits via GET; the server returns the same answer.
- Locale-aware. Currency formatting follows your language. We support 15 locales today.
FAQ
How is the percentage off calculated?
Saving = original price × discount percent ÷ 100. Final price = original price − saving. For example, a 50 dollar item at 20% off saves 10 dollars and costs 40 dollars.
Why is the URL changing as I type?
We encode the original price and the discount percent into the URL so you can bookmark or share any calculation. Send the URL to anyone and they will see the same numbers and the same result.
Can the discount percent be more than 100?
No — a discount greater than 100% would imply paying you to take the item, which is not a discount. We clamp the percent input between 0 and 100.
Does the calculator round to whole cents?
Display values are rounded to two decimal places. The internal calculation uses full floating-point precision, so very large prices or very small discount percents remain accurate.
What if the original price has cents in it, like 19.99?
That works — you can enter any positive decimal. A 19.99 item at 25% off saves 5.00 and costs 14.99 (rounded for display from 14.9925).
Where does the formula come from?
It is the standard percent-of formula taught in primary-school arithmetic. We cite Khan Academy and OpenStax College Algebra as accessible references for anyone who wants to see the derivation.