What is CPA?
Cost Per Acquisition – how much you pay to acquire one customer or conversion.
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How CPA Works
CPA, or Cost Per Acquisition (sometimes Action), measures the cost to acquire one customer or complete one desired action. It's calculated by dividing total campaign spend by the number of conversions. CPA is the metric that matters most for ROI-focused campaigns.
A "good" CPA depends entirely on your business economics—specifically your customer lifetime value (LTV). If your LTV is $500 and CPA is $50, you have healthy unit economics. If CPA exceeds LTV, you're losing money on every customer. Optimize CPA by improving conversion rates, refining audience targeting, testing landing pages, and adjusting bids based on conversion probability.
Frequently Asked Questions
What is CPA?
Cost Per Acquisition – how much you pay to acquire one customer or conversion.
CPA, or Cost Per Acquisition (sometimes Action), measures the cost to acquire one customer or complete one desired action. It's calculated by dividing total campaign spend by the number of conversions. CPA is the metric that matters most for ROI-focused campaigns.
What does CPA stand for?
Why is CPA important?
CPA is the ultimate efficiency metric for performance marketing because it directly ties marketing spend to business outcomes. It determines your payback period and growth scalability—if you can profitably acquire customers at a consistent CPA below your LTV, you can pour fuel on the fire and scale aggressively. Without knowing your CPA, you're essentially flying blind on profitability.
How do you calculate CPA?
CPA = Total Ad Spend ÷ Total Conversions. For example, if you spent $5,000 and acquired 100 customers, your CPA is $5,000 ÷ 100 = $50.00 per acquisition.