How it works
- You set the original price and the discount percentage with two sliders. Both values update beside their labels as you drag.
- The saving is price × discount ÷ 100, and the final price is the original minus that saving. The effective rate row simply restates the discount you set, so you can read the whole trade in one place.
- The proportion bar splits the original price into what you pay and what you save. It is drawn from the same two figures as the rows, so it cannot disagree with them.
- Everything recalculates on each input event — no submit button, no page reload, nothing sent to a server.
- Nothing you enter is stored. Reloading the page returns the defaults.
Limitations
It applies one discount to one price. Stacked offers — a percentage off followed by a coupon, or a sale price with a card discount on top — do not add up the way people expect. Thirty percent then twenty percent is not fifty percent off; it is forty-four, because the second discount applies to the already-reduced price. Run the tool twice, feeding the result of the first into the second, rather than adding the percentages.
Tax is not considered. Whether the discount applies before or after tax changes what you actually pay, and different sellers do it differently. If the price you started from includes tax, so does the result, and the saving figure is a saving on a tax-inclusive amount.
It cannot tell you whether the discount is real. A large percentage off an inflated reference price is the oldest trick in retail. The arithmetic here is exact; whether the original price was ever the price is a question the number cannot answer. Where a seller publishes a price history, that is worth more than the percentage on the label.
Rounding follows the seller, not this page. A discount that lands on a fraction of a rupee will be rounded somewhere, and different sellers round up, down or to the nearest unit at different points in the calculation. On a single item the difference is trivial; across a large basket it is enough to make the total on the receipt disagree with the figure you worked out here, and the receipt is the one that counts.
Questions
Are my figures saved anywhere?
No. The numbers exist only in this page while it is open. There is no account, no history, and no analytics event carrying your amounts.
How accurate is the result?
The arithmetic is exact, rounded only for display. Whether it matches the till depends on the seller's rounding rule and on whether the discount is applied before or after tax.
How do I calculate two discounts together?
Apply them in sequence, not by adding. Run the first discount, take the resulting price, and run the second on that. Thirty and then twenty percent leaves you paying fifty-six percent of the original, not fifty.
How do I work out what percentage off I was given?
Set the original price, then drag the discount slider until the final price matches what you were charged. The percentage on the slider is the effective rate, which is the honest way to compare two offers stated in different forms.
Do I need an account?
No. There is no sign-up, no email step and no usage counter. The tool is paid for by the ads on this page.
When people use it
The obvious case is standing in a shop or looking at a listing, working out whether the offer is worth what it looks like. The sliders sit directly under the heading, so the answer appears before you have finished reading the page — which is the only design requirement when someone is deciding in thirty seconds.
The less obvious case is on the selling side. Someone setting a promotional price needs to see the margin they are giving away, not just the headline that will appear on the listing. Dragging the discount slider and watching the 'you pay' side of the bar shrink is a more direct read on that than a spreadsheet cell.
A discount that is going onto a poster or a shelf label usually needs a way for people to reach the offer without typing a URL. QR code turns the link into a downloadable PNG, generated in your browser rather than routed through a tracking service.
How it compares
A phone calculator gets there in two operations if you already know which two. What this adds is that the saving and the final price appear together, so comparing '₹500 off' against '30% off' takes one glance instead of a conversion step. A spreadsheet is the right tool the moment there is more than one item — a whole basket, or a price list being marked down, needs a column, not a slider.