Google Ads CPA Calculator

CPA on Google Ads

Google Ads reports cost per conversion using whichever actions are marked Primary and counted, so the same campaign can show two very different CPAs depending on whether 'every' or 'one' conversion per click is counted and whether micro-conversions are included. Recompute it here from spend and the conversions you actually care about (orders, qualified leads) before setting targets.

The break-even CPA this calculator returns — revenue per conversion × margin — is the ceiling for a Target CPA bid strategy. Google will spend up to that target on average, so setting it at break-even means zero profit on the marginal conversion. Most advertisers set Target CPA at 70–85% of break-even for prospecting and let brand campaigns run without a cap.

Formula

CPA = Ad spend ÷ Conversions
Break-even CPA = Revenue per conversion × Gross margin
Profit per conversion = Break-even CPA − CPA

How to read CPA

Cost per acquisition is what one conversion cost you in media. It is the most direct efficiency metric for campaigns whose goal is a countable action — a purchase, a lead, an install — and the number you bid against when using target-CPA strategies.

The figure that matters more is break-even CPA: the gross profit one conversion brings in. Any CPA below it makes money on the first order; above it you are paying for growth and need repeat purchases (LTV) to justify it. Set target CPA as a fraction of break-even, not as a round number.

Frequently asked questions

Why is my actual CPA above my Target CPA?

Target CPA is an average Google aims for over time, not a cap per conversion. During learning, after budget changes, or with fewer than ~30 conversions a month, actual CPA drifts. Judge it over 30 days and with conversion delay accounted for.

Should CPA include Performance Max spend?

Yes, for blended account CPA. But PMax mixes brand, shopping and display, so its CPA looks better than a pure non-brand search campaign. Use brand exclusions and asset-group reporting to see what the incremental CPA really is.

CPA or CPL — what is the difference?

Same formula, different conversion. CPL (cost per lead) counts form fills or sign-ups; CPA usually counts paying customers. For lead-gen, use lead value (average deal value × close rate) as the revenue per conversion to get a meaningful break-even.

Why is my platform CPA lower than this?

Platforms count conversions with their own attribution windows and may include view-through conversions. Calculating CPA from your own order or CRM data with the platform's spend gives the real figure.

How does target CPA relate to ROAS?

They are two views of the same target: Target ROAS = Revenue per conversion ÷ Target CPA. A $120 order with a $40 CPA target is a 3.0× ROAS target.