Cost per Click in Digital Marketing: What It Is and How to Use It
Cost per click (CPC) is a digital advertising metric that shows how much an advertiser pays each time someone clicks on an advert. It is commonly used in paid search campaigns, social media advertising and other online ad formats where the aim is to attract visitors to a website or landing page.
Understanding CPC can help businesses plan advertising budgets, compare campaigns and assess whether their adverts are bringing in relevant traffic. However, a low CPC does not automatically mean a campaign is successful. The value of each click depends on what visitors do after they arrive.
How is cost per click calculated?
The basic formula is:
CPC = Total advertising spend ÷ Number of clicks
For example, if a campaign spends £120 and generates 300 clicks, its average CPC is 40p. This is an average: individual clicks may cost more or less depending on the advertising platform and the auction in which the advert appears.
What affects CPC?
CPC is influenced by several factors, and the exact calculation varies between advertising platforms. Common influences include:
- Competition: Popular search terms and audiences may attract more advertisers, which can push up the price of a click.
- Audience and location: The cost of reaching a particular demographic, location or audience segment can vary.
- Advert relevance: Platforms may consider how closely an advert and its landing page match the audience’s search or interests.
- Bid strategy: Manual bids and automated bidding strategies can affect how much a business pays for clicks.
- Placement and format: Costs can differ between search results, social feeds, websites and other placements.
- Timing: Demand may change by season, day or time, affecting the level of competition.
Why does CPC matter?
CPC provides a useful way to monitor how efficiently an advertising budget is generating visits. It can help marketers:
- estimate how much traffic a budget might produce;
- compare keywords, audiences, adverts or campaigns;
- identify sudden changes in advertising costs; and
- spot opportunities to improve targeting or advert relevance.
It is most useful when viewed alongside other measures. Click-through rate (CTR) shows the proportion of people who clicked after seeing an advert, while conversion rate shows the proportion of visitors who completed a desired action. Cost per acquisition (CPA) measures the cost of generating that action, such as a purchase or enquiry.
CPC is not the same as campaign success
A low CPC can look attractive, but inexpensive clicks are not necessarily valuable if they come from people who are unlikely to become customers. Conversely, a higher CPC may be worthwhile if those visitors are more likely to make a purchase or generate profitable leads.
For this reason, businesses should consider CPC in the context of their objectives. An awareness campaign may focus on reach and engagement, while a sales campaign may prioritise conversions, revenue and return on advertising spend (ROAS).
How to manage and improve CPC
Choose relevant keywords and audiences
Use targeting that reflects what potential customers are looking for. In paid search, review search terms and consider adding negative keywords to prevent adverts appearing for irrelevant queries. In other channels, refine audience settings using reliable customer and campaign data.
Make adverts more relevant
Write clear advert copy that matches the audience’s needs and the content of the landing page. A consistent journey from advert to page can improve the user experience and may support better campaign performance.
Improve landing pages
A click is only the beginning. Make sure the landing page loads promptly, works well on mobile devices and makes the next step clear. A useful, easy-to-navigate page can help turn more visits into enquiries or sales.
Test and refine campaigns
Test different headlines, creative, offers and audience segments. Change one or two elements at a time where possible, and allow enough data to gather before deciding what works. Regularly pause or revise adverts and targeting that attract clicks but do not contribute to the campaign’s goals.
Set a budget and monitor performance
Decide how much the business can afford to spend and how campaign success will be measured before launching. Monitor spend, CPC, conversions and revenue together, rather than making decisions based on a single metric.
CPC compared with CPM and CPA
Different pricing models suit different campaign objectives:
- CPC (cost per click): The advertiser pays when someone clicks on the advert.
- CPM (cost per thousand impressions): The advertiser pays for every thousand times the advert is shown. This may suit campaigns focused on visibility or reach.
- CPA (cost per acquisition or action): The cost is measured against a completed action, such as a sale, sign-up or lead.
These terms describe different ways of buying or evaluating advertising. The best approach depends on the campaign’s purpose, the platform and the quality of the available measurement data.
Conclusion
Cost per click is a straightforward but useful digital marketing metric. It shows how much a campaign spends, on average, to bring a person to a website through an advert. To use CPC effectively, look beyond the price of the click: assess the quality of the traffic, the actions visitors take and the overall return against the campaign’s objectives.
Optimising Cost Per Click: 7 Essential Tips for Digital Marketing Success
- Set a clear maximum cost per click before bidding.
- Use precise keywords to avoid irrelevant clicks.
- Write relevant ads to improve Quality Score.
- Add negative keywords to block unwanted searches.
- Test bidding strategies and compare results.
- Track conversions, not just clicks.
- Review CPC regularly and adjust bids.
Set a clear maximum cost per click before bidding.
Set a clear maximum cost per click before bidding to keep your advertising spend within budget and avoid paying more than a click is worth to your business. Base your limit on factors such as your profit margins, conversion rate and the value of a new customer, rather than choosing an arbitrary figure. Review campaign performance regularly and adjust your maximum bid as you gather data, while ensuring you do not restrict bids so much that your adverts stop reaching the right audience.
Use precise keywords to avoid irrelevant clicks.
Use precise, highly relevant keywords to help your adverts reach people who are genuinely interested in your products or services. Broad terms may attract more clicks, but many could come from people with little intention to buy, wasting your advertising budget. Review the search terms triggering your adverts and add negative keywords to exclude unrelated queries. This can reduce irrelevant clicks and help make your cost per click more effective.
Write relevant ads to improve Quality Score.
Write adverts that closely match the keywords, audience and landing page to make them more relevant to potential customers. In paid search campaigns, this can help improve your Quality Score, which may contribute to better ad positions and lower costs per click. Use clear, specific wording that reflects what people are looking for, and ensure the landing page delivers on the advert’s promise.
Add negative keywords to block unwanted searches.
Add negative keywords to prevent your adverts from appearing for searches that are unlikely to attract the right customers. For example, if you sell premium products, you might exclude terms such as “free” or “cheap”. Review your search-term reports regularly to spot irrelevant queries, then add suitable negative keywords. This can reduce wasted clicks, make better use of your advertising budget and help focus spending on searches more closely aligned with your offer.
Test bidding strategies and compare results.
Test different bidding strategies to find the approach that best suits your campaign goals and budget. For example, compare manual bidding, which gives you greater control over individual bids, with automated options that adjust bids based on your chosen objective. Run tests under similar conditions, allow enough time and data for meaningful results, and compare more than just cost per click: review conversions, cost per acquisition and overall return on ad spend. This helps you identify whether a lower CPC is also delivering valuable results.
Track conversions, not just clicks.
Track conversions, not just clicks. A click shows that someone visited your website, but it does not tell you whether they took a valuable action, such as making a purchase, submitting an enquiry or signing up to a newsletter. Monitor conversions alongside your cost per click to understand which campaigns are generating meaningful results. This helps you invest your budget in the adverts and audiences that contribute to your business goals, rather than simply attracting the most traffic.
Review CPC regularly and adjust bids.
Review your CPC regularly to see whether your adverts are attracting valuable traffic at a sustainable cost. Compare CPC with conversions and other campaign goals, rather than judging performance on clicks alone. If costs rise or results weaken, adjust your bids, refine your targeting or pause underperforming keywords and adverts. Make changes gradually and monitor the impact so you can identify what improves performance without overspending.
