🎯 CPA Calculator
Enter your ad spend and number of conversions to get your cost per acquisition.
CPA (cost per acquisition)
$25
spend ÷ conversions
How the cpa calculator works
CPA, cost per acquisition (or cost per action), is how much you pay on average to win one conversion, a sale, sign-up or lead. The formula is spend ÷ conversions. It is the bottom-line efficiency metric for performance marketing, because it ties your ad budget directly to results rather than to clicks or impressions. This calculator computes it instantly in your browser.
CPA is only useful next to customer value. A $30 CPA is a bargain if each customer is worth $200 and a disaster if they are worth $20. Compare CPA to your average order value or customer lifetime value to know whether a campaign is actually profitable.
Frequently asked questions
What is CPA?
CPA is cost per acquisition: the average ad spend needed to produce one conversion (a sale, sign-up or lead), calculated as spend ÷ conversions. It connects your budget directly to results.
How is CPA calculated?
CPA = total ad spend ÷ number of conversions. For example, $1,200 spent for 48 conversions is $1,200 ÷ 48 = $25 per acquisition.
What is a good CPA?
A good CPA is comfortably below the value of a customer. Compare CPA to your average order value or customer lifetime value: if a customer is worth $150 and your CPA is $30, the campaign is healthy.
What is the difference between CPA and CPC?
CPC is the cost of a click; CPA is the cost of a conversion. Many clicks do not convert, so CPA is always higher than CPC and is the truer measure of whether ad spend turns into customers.
Is anything uploaded?
No. The calculation runs in your browser.