Why CPA Is a Better North Star Than CPC
A campaign with a low CPC and a terrible conversion rate is still a bad campaign. We see teams optimize for CPC because it's visible and easy to move, while CPA - the metric tied to actual business outcomes - gets less attention than it deserves.
CPC optimization can actively hurt CPA
Bidding strategies that chase the cheapest clicks often pull in lower-intent traffic. The click gets cheaper while the cost per actual customer climbs, because conversion rate drops faster than CPC does.
What to track instead
Track CPA by channel and campaign, segmented by new versus returning customers where possible. A channel with a higher CPC but dramatically better conversion rate is usually the better investment.
- Set CPA targets before launching, not after seeing results
- Segment CPA by audience quality, not just by channel
- Review CPA weekly for the first month of any new campaign
When CPC still matters
CPC remains a useful early signal for budget pacing and competitive pressure - it's a leading indicator, not a goal in itself.
Frequently Asked Questions
It depends entirely on your customer lifetime value and margin - a 'good' CPA is one that's profitable relative to what a customer is worth to you, not a fixed number.
Most campaigns need at least 2-4 weeks and a meaningful conversion volume before CPA trends are statistically reliable enough to act on.
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Glad it was useful, Jamie - happy to go deeper on that if you want to book a call.
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Really useful breakdown - the point about cpc optimization can actively hurt cpa matches exactly what we ran into last quarter.