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Take a percentage or a flat amount off a price, or work out the discount between two prices. Then see the number most discount calculators skip: when you knock money off a fixed-cost job, it doesn't come out of revenue — it comes straight out of your profit. Enter your cost and the tool shows exactly how big that bite is.
Nothing you type leaves your browser. This isn't financial advice — for how a discount fits your whole rate, see the rate calculator.
A discount rests on one short line: original price − discount = final price. Everything else is just which two of those three numbers you already know. Take a percent off and the discount is the price times that percent. Take a flat amount off and the percent falls out of it. Know the original and final price and the discount is simply the gap between them, expressed back as a percentage.
A quick example. A $1,000 project at 20% off means a $200 discount, so the client pays $800 — and you keep 80% of your price. That's the part every discount calculator gets right. The part that matters for your business is what happens next.
Here's the trap. A discount looks like it comes out of revenue, but on a job with fixed costs it comes out of profit — dollar for dollar. Your costs don't shrink because you gave a discount; only your take-home does. So a discount that looks small as a slice of the price can be enormous as a slice of your profit.
Say that $1,000 job costs you $600 to deliver. At full price your profit is $400 — a 40% margin. Give the 20% discount and you still pay the $600 cost, so your profit drops to $200. A 20% discount off the price was a 50% cut to your profit. That's the same "one number, two different bases" trap that makes a 50% markup only a 33% margin — and it's why "just knock off 10%" is rarely as cheap as it sounds.
That second form is the rule of thumb worth remembering: divide the discount percent by your margin to see the real damage. A 10% discount on a 30% margin is a 33% profit hit. On a 20% margin it's a 50% hit. On a 50% margin it's "only" 20%. The thinner your margin, the more a polite little discount hurts — which is exactly why high-volume, low-margin work can't afford to discount the way a high-margin specialist can. Enter your cost above and the calculator shows your margin before and after, the profit you'd give up, and how many more sales at the discounted price it would take to earn that profit back.
None of this means never discount. It means discount on purpose. A discount can be worth it to win a long-term client, fill a slow month, or reward an upfront annual payment — but trade it for something: a longer commitment, a faster deposit, a testimonial, a reduced scope, or referral introductions. If you must drop the price with nothing in return, consider trimming scope instead so your rate stays intact, or framing the full price first and the discount as a one-time, clearly-labelled concession so it doesn't quietly become your new normal.
Multiply the original price by the discount percentage (as a decimal) to get the dollars off, then subtract that from the price. A 20% discount on $1,000 is $1,000 × 0.20 = $200 off, leaving a final price of $800. The Percent off mode above does this instantly and also shows the share of the price you keep.
Subtract the final price from the original to get the discount in dollars, then divide that by the original price. From $1,000 down to $800 is a $200 discount, and $200 ÷ $1,000 = 20% off. Use the Find discount mode and enter both prices — handy for checking whether a "sale" is as deep as it claims.
Because your costs don't fall when you discount — only your revenue does, so the whole discount comes out of profit. If a $1,000 job costs you $600, your $400 profit becomes $200 after a 20% ($200) discount: a 20% price cut is a 50% profit cut. A shortcut: divide the discount percent by your profit margin to estimate the hit. Enter your cost above to see your exact margin before and after.
Sometimes — but deliberately, and ideally in exchange for something (a longer contract, a bigger upfront payment, a testimonial, or a reduced scope). If you can't trade for it, it's often better to cut scope so your headline rate holds, or to label the discount as a clear one-time concession so clients don't expect it every time. Discounting from a thin margin is especially risky, which is why entering your cost here is worth it.
No. Every calculation runs entirely in your browser — nothing you type is sent to a server or stored. The link in your address bar updates so you can bookmark or share a scenario, but it only contains the numbers and mode you chose.
Keep going
The other direction — turn a cost into a price by markup or target margin.
Work backward from the take-home you want to the rate you need to charge.
Build a defensible fixed-price quote — labor, costs, buffer, deposit, and balance.