Free calculator
Cost Per Acquisition (CPA) Calculator
Enter what a campaign cost and how many actions it produced — leads, bookings or sales — to see what each one cost. Compare the result with what a lead or sale is worth to you before deciding whether to spend more.
What does each action cost me?
Name the action: leads, bookings or sales. A lead is not a paying customer.
Nothing is saved or sent anywhere.
Result
Enter your numbers
The CPA formula
CPA = Campaign spend ÷ ConversionsWhat you spent, divided by how many conversions it produced.
Example calculation
You spend $2,000 and get 40 conversions. Your CPA is 2,000 ÷ 40 = $50 per acquisition.
What this calculator tells you
CPA connects spend directly to outcomes. Unlike CPC or CPM, it counts the thing you actually want — a conversion — which makes it one of the clearest signals of whether a campaign is pulling its weight.
Common mistakes
- Judging CPA without knowing the profit each conversion is worth.
- Mixing conversion types (leads and sales) so the number loses meaning.
- Reacting to CPA before there are enough conversions to be reliable.
When this number is misleading
A low CPA looks great until you check what those conversions are worth. If you are acquiring cheap, low-value conversions — unqualified leads, one-time discount buyers — a small CPA can still lose money. CPA is only healthy when it sits well below the profit each conversion generates over time.
How to improve this metric
- Lift landing page conversion so the same clicks produce more conversions.
- Tighten targeting to reach people ready to act.
- Strengthen your offer and remove friction from the conversion step.
- Shift budget toward the audiences and creative with the lowest CPA.
Common questions
What is cost per acquisition (CPA)?
CPA is how much you spend to win one conversion — a customer, signup, booking or sale. It is your campaign spend divided by the number of conversions it produced.
What is the difference between CPA and CAC?
CPA usually measures the cost of a single defined conversion in a campaign, which may be a lead or a sale. CAC (customer acquisition cost) measures the full sales and marketing cost of winning an actual paying customer. CPA is narrower; CAC is the bigger picture.
What is a good CPA?
A healthy CPA is comfortably below the profit each conversion brings you. If a customer earns you $150 in profit and your CPA is $40, that works. The same $40 CPA loses money if the profit is $20.
Why is my CPA so high?
High CPA usually comes from a low conversion rate, expensive clicks, weak targeting, or a landing page that does not convert the traffic you are paying for.