Cost per click (CPC)

CPC has two meanings worth separating. Maximum CPC is the most you are willing to pay for a click, set by you or by automated bidding. Actual CPC is what you are charged for a specific click, which on platforms such as Google Ads is often lower than your maximum.

A low CPC is not automatically good. Cheap clicks from people who never buy cost more in the end than expensive clicks from ready customers. The figure that matters for the business is cost per enquiry or sale, which combines CPC with conversion rate.

How it works

On search platforms, each search triggers an auction among eligible ads. Your position depends on a score that combines your bid with the platform's view of ad quality, relevance and expected results, plus context such as device and location. In Google Ads, the actual price you pay is generally the minimum needed to hold your position, so it depends on the advertiser ranked below you and, when you have set a maximum bid, never exceeds it.

Average CPC is simply cost ÷ clicks. If a campaign spends 600 in a month and receives 400 clicks, the average CPC is 1.50 in that currency. Cost per conversion is cost ÷ conversions. If the same 400 clicks produce 20 enquiries, each enquiry cost 30. That second number is the one to compare with the value of a customer.

CPC varies with competition, season, location and the quality of your ads and landing page. Better relevance can lower what you pay for the same position, which is one reason vague ads pointing at a generic homepage cost more. To check your own CPC, look at it per keyword or search term, not just per campaign, because a campaign average often hides a few expensive terms doing most of the spending.

Example

A family law practice runs search ads. Its broad "lawyer" keywords have a high average CPC and few enquiries, because many searchers want other kinds of lawyers. Its specific keywords about divorce mediation in its city cost more per click than some other terms but convert far better.

The practice works out cost per enquiry for each group of keywords rather than looking at CPC alone. The specific terms produce enquiries at a fraction of the cost of the broad ones. It moves budget to them, adds negative keywords for unrelated legal areas and rewrites its ads to mention mediation by name, which raises relevance and lowers what it pays for the same positions.

Why it matters for your business

CPC decides how far your budget goes, so it matters for any paid campaign. Knowing your figures lets you compare channels, set realistic budgets and spot waste. The danger is optimising CPC on its own, which pushes campaigns towards cheap, low-intent clicks. Work backwards from what a customer is worth: if a customer is worth 500 in profit and one in ten enquiries becomes a customer, you can afford up to 50 per enquiry and still break even on the first sale.

Common mistakes

• Choosing keywords because they are cheap rather than because the people searching are likely to buy.
• Comparing CPC across countries or industries as if the figures were transferable.
• Raising bids to win the top position without checking whether the extra clicks convert.
• Ignoring the landing page, when better relevance can lower the price paid for each click.

Questions people ask

How is CPC calculated?

Average CPC is total ad spend divided by the number of clicks in the same period. If you spent 300 and received 200 clicks, your average CPC is 1.50. Ad platforms calculate it automatically, and you can view it per campaign, ad group, keyword or search term.

What is a good cost per click?

A good CPC is one that leaves a profit once you account for how many clicks become customers and what those customers are worth. A high CPC can be good if conversion is strong, and a low one bad if nobody buys. Judge it by cost per enquiry or sale.

How can I lower my CPC?

Make ads closely match the searches they show for, send clicks to a relevant landing page, use negative keywords to block wasted searches and organise keywords into tight groups. Better relevance and expected performance can lower the price for the same position. Avoid simply cutting bids, which may lose valuable clicks.