#782 · Marketing Tool

CPA Calculator

Measure cost per acquisition and compare it with your target and break-even CPA. Use this calculator to decide whether a campaign can acquire customers profitably.

Calculator

Marketing inputs
$
conversions
$
%
$
Ad space

How to use this calculator

  • Enter the campaign or channel metrics requested in the calculator.

What the result means

CPA is healthy when it is below the gross profit generated by each conversion and close to or below your target CPA.

CPA = Ad Spend ÷ Conversions; Break-even CPA = Average Order Value × Gross Margin

For subscription businesses, replace average order value with expected first-order margin or customer lifetime value margin.

Example calculation

With $2,000 spend and 40 conversions, CPA is $50. If AOV is $150 and margin is 50%, break-even CPA is $75.

Tips for better results

  • Improve conversion rate before cutting profitable traffic.
  • Raise AOV to increase allowable CPA.
  • Separate lead CPA from paying customer CPA.

FAQ

What is a good CPA for ecommerce?

A good ecommerce CPA is lower than the gross profit per order after product cost and fulfillment cost.

How do I lower my CPA?

Improve landing page conversion, targeting, creative relevance, checkout flow, and average order value.

What CPA should I target?

Target CPA should be below break-even CPA, which is average order value multiplied by gross margin.

How do I calculate customer acquisition cost from ads?

Divide total ad spend by the number of conversions or new customers acquired.

What is break-even CPA?

Break-even CPA is the highest acquisition cost you can pay before profit per order becomes zero.

Marketing decision module

MetricHow to use it
CPACost to generate one conversion.
Break-even CPAMaximum CPA before gross profit turns negative.
CPA GapDifference between current and target CPA.

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