What it is
Cost Per Acquisition (sometimes Cost Per Action) is the unit-economics metric that actually matters in performance marketing. CPC tells you how much each click costs; CPA tells you how much each customer or lead costs. CPA is calculated as: (Total ad spend) / (Total conversions).
What's a 'good' CPA? Depends on your customer LTV (Lifetime Value). General rule:
Healthy: CPA = 10-20% of LTV
Aggressive: CPA = 20-30% of LTV (sustainable if cash flow allows)
Unsustainable: CPA > 50% of LTV (you're losing money)
How to reduce CPA: better landing pages (highest leverage), tighter targeting, better ad creative, longer retargeting windows, post-purchase upsells to lift LTV (which makes higher CPAs sustainable).
Real example
A SaaS company with USD 1,500 LTV pays USD 200 CPA. That's healthy (13% of LTV). They optimize landing pages, CPA drops to USD 120. Now they can scale ad spend without losing margin.
How Apex Marketings uses this
Our marketing strategists work with this concept daily. Learn more about the related service: Performance Marketing, or get a free consultation on how this applies to your business.
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