What is profit margin?

It is profit divided by revenue, showing how much of each dollar sold you keep.

How does margin differ from markup?

Margin uses revenue as the base, while markup uses cost, so the two percentages are never the same.

Profit Margin Calculator

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Revenue ($)

Cost ($)

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Compute the profit margin on your revenue and cost, and the implied markup. Free, no signup.

How to use Profit Margin Calculator

Open the toolNo signup and nothing to install; it works as soon as the page loads.
Set “Revenue”
Set “Cost”
Read the resultChange any input and the result is recalculated immediately.

Worked example with the defaults

PROFIT MARGIN · $40.00 profit on $100: 40.0%

Nothing you enter leaves your device

All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.

That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.

What this tool does not do

Profit Margin Calculator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.

It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.

Frequently Asked Questions

What is profit margin?: It is profit divided by revenue, showing how much of each dollar sold you keep.
How does margin differ from markup?: Margin uses revenue as the base, while markup uses cost, so the two percentages are never the same.