What is cost per action (CPA)?
Online advertising is all about efficiency: how do you get the most out of your budget? CPA, or Cost Per Acquisition, helps you measure exactly that. It shows how much you pay to win one customer or achieve a desired action. Think of a purchase, a sign-up or a download. CPA is an important KPI because it shows directly how cost-efficient your campaigns are. The lower the CPA, the better your ad performance. CPA stands for Cost Per Action, also known as cost per acquisition. It measures how much you invest to achieve a conversion. A conversion can be anything, depending on your business goals: a purchase in a webshop, a completed contact form, or a new newsletter sign-up.
The formula for CPA is as follows:
CPA = Total advertising costs ÷ Number of conversions
CPA = Total advertising costs ÷ Number of conversions
Let's look at an example: say you spend €500 on ads and get 50 purchases from that campaign.
The calculation:
CPA = €500 ÷ 50 = €10
In this case, each purchase costs you €10.
How is CPA calculated and used in marketing?
CPA is one of the most widely used metrics in performance marketing. It's often used alongside other statistics, such as ROAS (Return On Ad Spend) and CTR (Click Through Rate), to get a complete picture of how well your campaigns are performing.
- Cost control: CPA helps you determine how much you can spend and still remain profitable.
- Ad optimisation: It gives insight into which ads, audiences or channels are the most cost-efficient.
- Goal-oriented strategy: With a low CPA you can scale up faster and get more out of your budget.
Why is CPA an important KPI?
CPA is essential because it goes beyond clicks and impressions. It focuses on actual results that contribute to your business goals.
- Clear picture of costs: With CPA you can see straight away how much each new customer or conversion costs you.
- Improved budget allocation: It helps you distribute your budget better across campaigns that convert at lower costs.
- Optimising ROI: By keeping an eye on CPA, you make sure your campaigns stay profitable.
Note: what counts as a good CPA depends on your industry and the type of conversion. A webshop may have a low CPA, while a B2B company may accept a higher cost per lead because of higher margins.
Tips for lowering your CPA
Want more conversions without costs spiralling out of control? Here are some practical tips:
- Improve your targeting: Aim your ads at specific audiences that are most likely to convert. You can do this with tools such as lookalike audiences or remarketing.
- Optimise your ads: Use eye-catching visuals, persuasive copy and a clear call to action. Ads that resonate with your target audience increase the chance of conversions.
- Work on your landing page: Make sure the page people land on after clicking an ad is relevant and persuasive. Think of fast loading times, clear information and a user-friendly structure.
- Test regularly: Set up A/B tests for your ads and landing pages to discover what works best.
- Use bidding strategies: Platforms such as Google Ads offer smart bidding strategies such as 'Target CPA'. These automatically optimise your bids to achieve your desired CPA.
- Monitor your performance: Analyse your campaigns regularly. Stop poorly performing ads and invest more in campaigns with a low CPA.
What is a good CPA?
A 'good' CPA differs per business and industry. It depends on:
- Your profit margin: A CPA that is lower than your average margin is often profitable.
- Your business goals: If your goal is to generate leads, a higher CPA may be acceptable than if you want to achieve direct sales.
- Your sector: In e-commerce, a CPA of €10 to €20 is often ideal, whereas in the B2B sector a CPA of €100 to €200 can be normal because of the higher customer value.
The most important thing is that your CPA fits your goals and strategy.
Common mistakes when working with CPA
CPA is a simple but powerful metric, which is why it's sometimes misused. Here are some mistakes to avoid:
- Too broad a focus: By appealing to too many audiences, your costs can rise without generating additional conversions.
- Ignoring additional costs: Think of shipping costs, staff or other overheads that are not included in your CPA.
- Not optimising: A high CPA doesn't have to be bad, as long as your campaigns are well optimised and contribute to your profit goals.
CPA is an indispensable metric if you want to understand how cost-efficient your campaigns are. By calculating and monitoring the cost per conversion, you can make targeted decisions about your marketing budget and campaign strategy.
A low CPA means more value for your marketing spend, but don't forget that it should always be viewed in the context of your business goals. With the tips in this article you can lower your CPA and get more out of your marketing efforts. Start lowering your CPA today and find out for yourself what it can do for your marketing. Want to talk to one of our specialists? Get in touch with us.