CPC: what it is, how to calculate it and your maximum CPC
CPC (cost per click) is how much you pay, on average, for each click on your ad. It combines the auction price with the creative's ability to earn the click.
Formula
CPC = Spend ÷ Clicks
This also holds: CPC = CPM ÷ (1,000 × CTR). If CPC went up, check whether the auction (CPM) or the creative (CTR) moved.
Worked example
- Spend: $900
- Clicks: 600
$900 ÷ 600 = $1.50 per click
With an $80 target CPA and a 2% site conversion rate, the max CPC is $80 × 0.02 = $1.60. This ad group is at the limit.
What the agents do with your CPC
12 search terms with a CPC above $4 spent $860 this month with zero conversions.
Suggestion: add the 12 terms as negatives. The other keywords in the ad group convert at an average CPC of $1.40.
How to read CPC
Max CPC = target CPA × conversion rate
That is the ceiling that makes the numbers work. Above it, even at an average conversion rate, each sale costs more than it can.
In Google Ads, quality lowers CPC
An ad and a page relevant to the term improve Quality Score and reduce what you pay for the same position in the auction.
Read by term and by ad
The campaign's average CPC hides expensive terms that do not convert. The decision is usually at the search term level.
When the number misleads
Cheap clicks without intent
Broad terms and cold audiences bring cheap clicks from people who do not buy. A low CPC is only good if conversion keeps up.
"CPC (all)" in Meta Ads
It includes clicks that do not lead to your site. To decide, use cost per link click.
An average that mixes in brand
Brand terms have a low CPC and pull the average down, hiding expensive generic terms.
Where CPC shows up
Ask Sherlok
Which terms have the highest CPC with no conversions?
Did my CPC rise because of the auction or the ad?
What is my max CPC for the CPA I want?
Which ad group has the best CPC with sales?
Questions about CPC
What is a good CPC?
One below your max CPC (target CPA × conversion rate). A $5 CPC can be great for a high-ticket product and terrible for a $50 one.
How do I lower my CPC?
Improve CTR (more relevant creatives and ads), page relevance in Google Ads, and add negatives for terms that bring clicks without intent.
CPC or CPA: which comes first?
CPA, which is the cost of the result. CPC helps explain CPA: if it rose, look at CPC and conversion rate to know where to act.
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