Advertising
CPC vs CPA: cost per click or cost per acquisition in B2B?
Copy for AI
CPC and CPA sound almost identical, but they measure two completely different things. CPC (cost per click) is what you pay for one click on your ad. CPA (cost per acquisition, also called cost per conversion) is what you pay for one actual action, such as a completed contact form or a quote request. In short: CPC pays for traffic, CPA pays for results. And for most B2B companies, only the latter is worth steering on.
We are a Belgian B2B growth agency, a small team that would rather steer on customers and revenue than on vanity numbers. We see it often: a dashboard proudly showing a low CPC while hardly any leads come in at the bottom of the funnel. In this article we explain what both metrics really mean, how they connect to your bidding strategy, and why in B2B you should not chase the cheapest click.
Tip: calculate your cost per lead with our free budget calculator.
What exactly does CPC (cost per click) mean?
CPC is the amount you pay every time someone clicks on your ad. You do not pay for impressions (how often your ad appears), only for the click that brings someone to your site. It is the most basic metric in search engine advertising: you bid on keywords, your ad appears, and the meter only starts running on a click. If you pay per thousand impressions instead, you are in a different model: see the difference between CPC and CPM for that.
The formula is simple:
CPC = total ad spend / number of clicks
Spend 500 euros and get 250 clicks, and your CPC is 2 euros. CPC gives you control over your maximum bid per click and is useful when you want to attract a lot of traffic. But that is exactly where the catch is: a click is not a customer. You can pull in hundreds of cheap clicks that never request a quote. What an average click costs in your sector and how to get a grip on it, you can read in our CPC benchmarks by industry.
What does CPA (cost per acquisition) mean?
CPA is the amount you pay per completed action. Not per click, but per conversion: a quote request, a demo sign-up, a downloaded whitepaper or a phone call. So you pay for the result that truly matters, not for the intermediate step.
The power of CPA is that the cost is directly tied to performance. Every euro you count is attached to a measurable result. That makes CPA the natural metric for lead generation, and therefore for virtually every B2B company. The downside: steering on CPA takes more setup. You need reliable conversion tracking, and it can take a while before the system has enough data to optimise well. But that is precisely the investment that pays off, because without that data you are steering blind.
Mind the terminology: CPA and “cost per conversion” are mostly used interchangeably. In practice people mean the same thing: what one desired action costs you.
CPC vs CPA: the difference in one table
| CPC (cost per click) | CPA (cost per acquisition) | |
|---|---|---|
| You pay for | Every click | Every conversion/action |
| Measures | Traffic and reach | Results and return |
| Risk | You also pay for clicks that deliver nothing | Lower: you pay for the result |
| Setup | Simple | Requires conversion tracking and data |
| Suited for | Reach, awareness, quick testing | Lead generation, sales, B2B |
| B2B relevance | Limited on its own | High: ties budget to leads |
The core: CPC tells you how expensive your traffic is, CPA tells you how expensive your results are. They do not exclude each other, but they answer a different question.
How are CPC and CPA connected?
This is the insight many teams miss: CPC and CPA are not opposites, they are two sides of the same euro. They are connected by your conversion rate.
CPA = CPC / conversion rate
Say your CPC is 2 euros and 5% of your clicks convert. Then one conversion costs you 2 / 0.05 = 40 euros. Double your conversion rate to 10% (for example with a better landing page) and your CPA drops to 20 euros, without your CPC changing by a single cent.
That immediately explains why steering only on a low CPC is dangerous. Two scenarios:
- Advertiser A: CPC of 1 euro, conversion rate 1%. CPA = 100 euros.
- Advertiser B: CPC of 3 euros, conversion rate 6%. CPA = 50 euros.
Advertiser B pays three times as much per click and still gets leads for half the price. Anyone looking only at CPC would call the wrong campaign the “winner”. If you want to understand exactly how that conversion rate comes about, our explanation on calculating conversion rate will help you further.
How does this translate into your Google Ads bidding strategy?
In Google Ads you see these two metrics reflected in two kinds of bidding strategies:
- Manual CPC (and Enhanced CPC): you set the maximum bid per click yourself. This gives control and is useful when you have little data or when testing new keywords, but it optimises for clicks, not for conversions.
- Target CPA and Maximise conversions: you give Google a target cost per conversion and the algorithm adjusts bids automatically to get as many conversions as possible within that target. Google explains itself how search campaigns steer on this. It does require your conversion tracking to be in order and enough conversion data to learn from.
The logical order for B2B: start with (enhanced) manual CPC to gather data and get to know your keywords, then switch to target CPA as soon as you have enough conversions to let the algorithm steer reliably. Which strategy fits which stage, we work out in our guide on the right Google Ads bidding strategy. If you want to keep your click price healthy in the meantime, read how to reduce your CPC without throwing away reach.
Why does B2B steer better on CPA than on cheap clicks?
Because a B2B company is not a webshop. In e-commerce an impulse click can lead straight to a purchase, but in B2B the road is longer: someone clicks, orients themselves, compares, requests a quote, and only weeks later does the decision fall. In that world a click is only the very first, non-committal signal.
That is why a low CPC on its own is meaningless. What counts is your cost per qualified lead: how much does it cost to bring in someone who genuinely fits your profile and has a chance of becoming a customer? A cheap click from someone who would never buy is more expensive than an expensive click from a qualified prospect.
Our honest advice: do not be seduced by a dashboard flaunting low click prices. Steer on the end of the funnel. A Google Ads specialist combined with solid conversion tracking delivers more than endlessly tinkering with the price per click. At Facilicom we achieved 25% media savings this way by steering on quality and quality score instead of on volume, proof that smarter bidding pays off more than cheaper clicking.
Frequently asked questions about CPC vs CPA
Is a low CPC always good?
No. A low CPC is only good if those clicks also convert. Cheap clicks that never produce a lead ultimately cost you more per result than more expensive, better-targeted clicks. Always look through to your CPA and your cost per qualified lead.
Is CPA the same as cost per conversion?
In most contexts, yes. Both CPA (cost per acquisition) and “cost per conversion” describe what one desired action costs you, whether that is a request, a download or a sign-up. The terms are used interchangeably.
Do I have to choose between CPC and CPA?
Not as a metric: you measure both. What you do choose is your bidding strategy. Often start with manual CPC to get to know your data and keywords, then move to target CPA as soon as you have enough conversions to let the algorithm optimise.
How do I lower my CPA?
The fastest lever is not in your bid, but in your conversion rate. Because CPA equals CPC divided by conversion rate, every improvement to your landing page, your offer or your targeting lowers your CPA, without your click price changing.
What is a good CPA in B2B?
That depends entirely on your deal value. A good CPA is one that sits well below your margin per customer, so every lead stays profitable. Always calculate back from what a customer brings you in, not from a generic benchmark figure.
Want to steer on leads instead of on clicks?
CPC vs CPA is ultimately not a technical discussion, but a choice about what you steer on: cheap traffic or measurable results. We help Belgian B2B companies set up their Google Ads so that every euro goes to qualified leads, not to empty clicks. No vanity numbers, just honest steering on revenue.
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