CPC
Also: CPC, Cost Per Click, Pay Per Click price, Coût Par Clic
Cost Per Click (CPC) is the average amount you pay each time someone clicks your ad. It is a core pricing metric for paid search and social advertising.
What It Is
Cost Per Click (CPC) is the average price you pay each time a user clicks one of your ads. It is the dominant pricing model in paid search (Google Ads, Microsoft Ads) and a common option across social and display platforms. You are charged only when a click happens, not when the ad is merely shown.
The formula is simple:
- CPC = Total Ad Spend / Total Clicks
CPC differs from related pricing models:
- CPM (cost per thousand impressions): you pay for visibility, not clicks.
- CPA (cost per acquisition): you pay per conversion, not per click.
Why it matters
CPC sits at the entry point of the acquisition funnel, so it directly shapes how far your budget stretches.
- Budget efficiency: a lower CPC brings more traffic for the same spend.
- Competitive signal: CPC reflects auction pressure. Rising CPC in a keyword or audience often means more competitors are bidding.
- Quality feedback: on most platforms, higher ad relevance and quality scores lower your effective CPC, rewarding better creative and targeting.
CPC alone does not measure profitability. A cheap click that never converts is worse than an expensive click that does. It must be read alongside conversion rate and downstream value.
How it is used in practice
- Bidding: set manual CPC bids (a cap per click) or let automated bidding optimize toward a target.
- Channel comparison: benchmark CPC across search, social, and display to reallocate budget.
- Diagnostics: a sudden CPC spike can flag increased competition, a broken landing page score, or seasonal demand.
- Chaining metrics: combine CPC with conversion rate and average order value to derive true cost per customer and return on ad spend.
Worked Example
A campaign spends 1,000 EUR and receives 500 clicks.
- CPC = 1,000 / 500 = 2 EUR per click
Now add downstream data. If 5% of those clicks convert:
- Conversions = 500 x 0.05 = 25 sales
- Cost per acquisition = 1,000 / 25 = 40 EUR
If each sale is worth 120 EUR, the campaign returns 3 EUR for every 1 EUR spent. The 2 EUR CPC is acceptable because the funnel converts profitably. Halve the conversion rate to 2.5%, and cost per acquisition doubles to 80 EUR, changing the verdict entirely.
Takeaway: CPC is the price of attention. Its value depends on what that attention converts into.
See also
Frequently asked questions
How is CPC calculated?
CPC (cost per click) is total ad spend divided by total clicks. A campaign spending 1,000 EUR for 500 clicks has a CPC of 2 EUR. It is an average after the fact, not a fixed price: each auction settles at its own price, and the figure you report is the blend.
What is the difference between CPC, CPM and CPA?
They bill on three different events. CPC charges you per click, CPM per thousand impressions (visibility, regardless of clicks), and CPA per conversion. CPC is the dominant model in paid search such as Google Ads and Microsoft Ads, where nothing is charged when the ad is merely displayed.
Is a low CPC always a good sign?
No. A cheap click that never converts costs more than an expensive click that does. CPC measures the price of attention, not profitability, so it has to be read alongside conversion rate and downstream value like average order value.
How do I get from CPC to cost per customer?
Chain CPC with conversion rate. With 500 clicks at 2 EUR and a 5% conversion rate, you get 25 sales for 1,000 EUR, so 40 EUR per customer. If each sale is worth 120 EUR, the campaign returns 3 EUR per euro spent; halve the conversion rate to 2.5% and cost per acquisition doubles to 80 EUR.
What does a sudden CPC spike tell me?
Three causes are worth checking first: more competitors bidding on the same keyword or audience, a drop in ad relevance or quality score that raises your effective CPC, and seasonal demand. Platforms reward relevance with cheaper clicks, so a degraded landing page or creative can push the price up without any change in competition.