Discount Calculator
Original price and discount in, sale price and savings out — check what a promotion really costs you.
Discounts feel simple until you run one and the profit disappears. This discount calculator turns an original price and a discount percent into the sale price a customer pays and the amount saved, so both sides of a promotion are visible before you announce it. The number that matters most is not the discount percent but what is left after it, because a discount comes off revenue while your costs stay fixed. That is why a twenty percent discount cuts profit by far more than twenty percent when margins are thin, and why stacking two discounts is much more expensive than it sounds. If you are the seller, enter your cost as well and the calculator will show the profit margin that remains after the discount, so you can decide whether the promotion is worth it or whether you should shrink the scope instead. If you are the buyer, the savings figure is the check against the shelf price. Either way, the math takes seconds and removes the guesswork. All calculations run in your browser and nothing is stored.
Your numbers
Your discounted price
Note: discount cuts revenue but not cost. Check the margin after discount before you run a sale — it falls faster than the discount percent.
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How to use the result
- Use the sale price as the price to advertise, and the saved amount as the headline saving for the buyer.
- Use the margin after discount to decide whether the promotion is affordable — if it drops near zero, reduce the discount or the scope.
- Do not stack discounts without recalculating: two 20% discounts are a 36% cut, not a 40% cut, and the margin damage is still severe.
Frequently asked questions
How do stacked discounts work?
Apply each discount to the already-discounted price, not to the original. Two 20% discounts give 0.80 × 0.80 = 0.64, i.e. a 36% total cut.
Why does a small discount hurt profit so much?
Because the discount comes off revenue while costs stay fixed. With a $120 cost on a $200 price, a 25% discount cuts profit from $80 to $30 — a 62.5% fall.
What if I do not know the cost?
Leave cost at 0 and use the sale price and savings only. To judge whether a promotion is affordable, you need the cost — enter it when you have it.