Free Discount Calculator
The amount off and the final price in a second - and, if you're the one giving the discount, the part most calculators skip: what it does to your margin, and how many extra sales it takes to break even on the gesture. Free, no sign-up.
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A 10% discount is not a 10% cost
The discount comes off the price, but it comes out of the profit. Sell at 10,000 with a 7,000 cost and your profit is 3,000 per unit. Give 10% off and the customer saves 1,000 - while your profit drops to 2,000. The customer sees a 10% gesture; your bottom line takes a 33% hit.
Which is why the follow-up question matters: at 2,000 profit per unit, you now need 50% more sales to earn what you earned before. Some promotions clear that bar. Most don't - and it's better to know before the banner goes up.
Discount Calculator FAQ
How do I calculate a discount?
Discount amount = original price x discount %. Final price = original price - discount amount. A 10% discount on 10,000 takes off 1,000, leaving 9,000. Enter your numbers above and it's done live.
How do stacked discounts work - is 20% + 10% the same as 30%?
No. Discounts stack multiplicatively: 20% then 10% off leaves 80% x 90% = 72% of the original price - a 28% total discount, not 30%. On 10,000, that's 7,200 rather than 7,000. Apply the second discount to the already-reduced price.
What does a discount really cost the seller?
Much more than it looks, because the discount comes entirely out of your profit, not your costs. Selling at 10,000 with a 7,000 cost, your profit is 3,000; a 10% discount cuts the price by 1,000 but your profit by a third. That's why the calculator asks for your cost - the discount's true price is measured in margin.
How many extra sales does a discount need to pay for itself?
Enough to rebuild the profit the discount gave away: old profit per unit ÷ new profit per unit, minus one. In the example above, 3,000 ÷ 2,000 means 50% more units just to earn the same total profit. If the promotion won't plausibly lift volume that much, it's a donation, not a strategy.
When do discounts make sense?
When they buy something specific: clearing stock that ties up cash, rewarding early payment (a 2% discount for paying now can beat chasing the invoice for 60 days), winning a strategic customer, or lifting order size with volume breaks. A blanket discount to 'boost sales' usually just re-prices your existing demand.
How is this different from a Growpins Ledger account?
This calculator shows one discount's effect. A free Growpins Ledger account records the prices you actually invoiced, tracks each product's margin, and its price history audit trail shows every change - so you can see whether last quarter's promotion actually paid.
Did last quarter's promotion actually pay?
A free Growpins Ledger account records what you actually invoiced, tracks margin per product, and keeps a price history audit trail - so promotions get judged on numbers, not vibes. Built by the team behind Growpins, founded by Dokun Bamigboye.
Judge promotions on data - sign up freeSetting the base price first? Use the Product Pricing Calculator, or browse all free tools.