Tools / ChatGPT Ads budget calculator
🧮 Free and unlimited

ChatGPT Ads budget and CPA calculator

Enter your budget and your real rates: you get clicks, conversions, cost per acquisition, ROAS and break-even, with every formula shown.

The total amount you commit over the period.
With no ChatGPT Ads history, start from your Google Ads CPC on the same kind of query.
Used to estimate the impression volume needed. It affects neither CPA nor ROAS.
The real one, measured on your landing page. This is the number that weighs most on the result.
Average order value, or the value of a qualified lead multiplied by your sales close rate.
Free, unlimited, no account

This tool runs entirely in your browser. Nothing you type here reaches our servers, nothing is stored, there is no account to create and no quota to respect. We can give it away because it costs us nothing to run.

What this tool does

An advertising budget is not decided by feel: it follows from four numbers you already know, or can honestly estimate. This calculator makes no hidden assumption and prints every formula it uses, so you can redo the maths by hand and challenge the result when your assumptions change. No figure comes from a database of industry averages: everything comes from what you type in.

  • Computes clicks, the impressions needed, expected conversions and the revenue generated.
  • Gives the real cost per acquisition and compares it to your conversion value.
  • Shows ROAS and margin per conversion, positive or negative.
  • Computes the maximum sustainable CPA and the minimum conversion rate that avoids losing money.
  • Every formula is printed below the result: nothing is magic, everything is checkable.

The formulas used

No hidden coefficient, no market average. You can redo every line by hand.

  • Clicks = Budget ÷ CPC
  • Impressions needed = Clicks ÷ (CTR ÷ 100)
  • Conversions = Clicks × (Conversion rate ÷ 100)
  • CPA = Budget ÷ Conversions, which is the same as CPC ÷ (Conversion rate ÷ 100)
  • Revenue = Conversions × Value of one conversion
  • Net result = Revenue − Budget
  • ROAS = Revenue ÷ Budget
  • Maximum sustainable CPC = Value of one conversion × (Conversion rate ÷ 100)
  • Break-even conversion rate = CPC ÷ Value of one conversion, expressed as a percentage

Frequently asked questions

Which CPC should I use if I have never run ChatGPT Ads?
Start from your Google Ads CPC on queries with the same intent, then test a range: running the same calculation with a low and a high CPC shows you the size of the risk. That is more useful than one number you have no reason to trust.
Does click-through rate change the CPA?
No, and it is counterintuitive. With cost-per-click billing, CTR only changes how many impressions are consumed to get your clicks. CPA depends on CPC and conversion rate, not on CTR. CTR matters mostly because a weak one eventually pushes the CPC up.
What conversion value should I use for lead generation?
Take the average value of a signed client multiplied by the share of leads that sign. A lead worth a 1,000 contract at a 20% close rate is worth 200. Using the contract value without applying the close rate is the mistake that blows budgets up.
What is the break-even conversion rate for?
It tells you the conversion rate above which the campaign stops losing money. If that threshold sits far above what your page achieves today, the problem is not the ad budget: it is the landing page.
Do these figures account for tax and fees?
No, the calculation is gross. If your conversion value includes tax, strip it out, and subtract cost of goods sold before entering the value if you want to reason in margin rather than revenue.

Beyond the generator

These micro-tools produce a file. The Ready2GEO scanners go and look at what is actually happening on your site and inside AI answers.

📣 ChatGPT Ads Readiness

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Paste your server logs and see which AI crawlers really visit, how often, and which pages they choke on.

Analyse my logs 🧭 Full GEO audit

The bundled audit aggregates every scanner into a single report, with prioritised fixes and a PDF export.

Run the audit

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