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ROAS / CPA / CPM Calculator

Five calculators in one: ROAS, CPA, CPM, CTR, and break-even ROI.

Formula: Revenue ÷ Ad Spend

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Fill in the fields above to see your result.

What are ROAS, CPA, CPM, CTR & break-even ROAS?

These five numbers are the core vocabulary of paid marketing performance. ROAS (Return on Ad Spend) tells you how much revenue a campaign generated per dollar spent. CPA (Cost Per Acquisition) tells you what one conversion actually cost you. CPM and CTR describe how efficiently your ad reached and engaged people. And break-even ROAS is the line between a campaign that's losing money and one that's actually profitable, once your margins are accounted for.

A high ROAS with a thin margin can still lose money — that's exactly what the break-even calculator is for.

How to use this tool

1Pick the metric you need from the tabs above (ROAS, CPA, CPM, CTR, or Break-even ROAS).
2Enter the numbers from your ad platform's reporting dashboard.
3Your result updates instantly — no need to hit a generate button.
4Switch tabs any time; each calculator remembers what you typed into it.

Why these numbers matter

  • ROAS alone can be misleading — pair it with break-even ROAS to know if you're actually profitable
  • CPA tells you if a channel is sustainable at your current customer lifetime value
  • CPM and CTR together show whether a weak campaign is a targeting problem or a creative problem

FAQ

What's a "good" ROAS?
It depends entirely on your margins — a 3x ROAS can be very profitable for a 60%-margin product and a loss for a 15%-margin one. Always check it against your break-even ROAS.
What's the difference between ROAS and ROI?
ROAS compares revenue to ad spend only. ROI factors in your full cost of goods, so it reflects actual profit rather than top-line revenue.
Does this tool store the numbers I enter?
No. Every calculation runs in your browser — nothing is sent to or saved on our servers.

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