CPA calculator

Use this CPA calculator to divide campaign costs by conversions. Add a target cost per acquisition or a conversion goal to see the budget and results you need.

Free, no sign-up. Runs in your browser, with no AI calls.

Your result

Total campaign cost
$2,500

Total cost = ad spend + other campaign costs

Cost per acquisition (CPA)
$50

CPA = cost / conversions

Conversions needed at the target CPA
100

Conversions needed = total cost / target CPA, rounded up

Budget for the goal at the current CPA
$5,000

Budget = conversion goal × current CPA

Budget for the goal at the target CPA
$2,500

Budget = conversion goal × target CPA

What this means

Each conversion costs $50 once all campaign costs are counted.

Next step

Each conversion costs $25 more than the target. Raise the conversion rate or lower the cost per click; the CPC calculator shows the bid that fits the target. Find the CPC that fits the target

Worked example. Change the inputs to use your own data. Currency follows the page language; no exchange-rate conversion is applied.

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Cost per acquisition is total campaign cost divided by conversions. Spend of 2,000 plus 500 for design and tools, with 50 sales, gives a CPA of 50. At a target CPA of 25, the same 2,500 has to bring 100 conversions. A conversion is the action you count, such as a sale, booking or sign-up.

How to use this tool

Count the full cost
Total cost = ad spend + other campaign costs such as design, tools or agency fees. Leave the other costs at zero to match the cost per conversion that ad platforms report.
Divide by conversions
CPA = total cost / conversions, the way Google Ads Help calculates average CPA. Count one kind of action consistently, for example a sale, a booking or a form sent.
Plan from a target
Conversions needed = total cost / target CPA, rounded up. Budget for a goal = goal × CPA, shown at your current CPA and at the target. Both assume the cost per conversion stays level as spend grows; check it after each budget change.

Google Ads Help: average CPA

Questions before you start

CPA counts every conversion you choose to track, including repeat buyers and sign-ups that never pay. Customer acquisition cost divides all marketing and sales spend by new paying customers only. Use the CAC calculator for that view.

One below the gross profit a conversion brings. If a sale leaves 60 after product costs, a CPA of 50 keeps 10, and a CPA of 70 loses money on the first order unless the customer buys again.

Related tools

  • Cost per lead calculator

    Use this cost per lead calculator to divide campaign cost by leads. Add your lead to customer rate to see the cost of each new customer and the leads a sales goal needs.

  • ROAS calculator

    Use this ROAS calculator with your revenue and spend. Add margin for break-even return, profit targets and ROI, then compare revenue scenarios.

  • Customer lifetime value calculator

    Use this customer lifetime value calculator for simple revenue, margin-based LTV or observed cohort retention. Compare LTV with CAC, payback and changes to your own assumptions.

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