If your business buys leads or uses paid acquisition channels, you may have come across two common pricing models: cost per lead (CPL) and cost per acquisition (CPA). While both metrics provide insight into what you pay to scale your business, they are entirely different.
This guide will help you understand the differences between cost per lead and cost per acquisition, explain how to calculate CPL vs CPA, and determine which pricing model is best for your business.
Key Takeaways
CPL measures the cost of generating a lead; CPA measures the cost of converting a lead into a paying customer.
CPL sits earlier in the funnel and puts conversion risk on the buyer; CPA sits later and shifts more of that risk onto the provider.
CPL tends to suit businesses with a long sales cycle or an in-house sales team; CPA suits businesses that want cost certainty per customer.
Whichever model you use, UK GDPR and PECR rules on consent apply to how those leads were originally generated.
Many businesses use both models across different channels or funnel stages, rather than picking one exclusivity.
Use ProInteractive to fill your pipeline with qualified leads.
What Is Cost Per Lead (CPL)?
Cost per lead (CPL) is the total cost incurred when acquiring a single customer who has shown an interest in your product or service through a specific activity like completing a form or asking for a quote.
CPL is a metric that measures the efficiency of your marketing activities, and its effectiveness is measured not in revenue but in interest in your product. The metric that measures revenue conversion is CPA, and it will be discussed later.
CPL Formula
CPL = Total Campaign Spend/Number of Leads Generated
Example: For instance, spending £3,000 on a particular campaign and getting 150 leads means that your CPL is £20 per lead.
It is important to note that a ‘lead’ may have different meanings depending on the nature of the company and even the campaign; hence, you should agree on a definition of a ‘lead’ before making comparisons of CPLs across various campaigns or marketers.
Read ProInteractive’s detailed guide about exclusive leads and shared leads.
What Is Cost Per Acquisition (CPA)?
Cost per acquisition is the sum that goes into acquiring one customer on average. Contrary to CPL, it is not about getting interest but about reaching the point when prospects turn into your customers, such as making purchases, signing the contract, or subscribing.
Since CPA is calculated further along the funnel, compared to CPL, it is believed to be a better way of measuring the marketing ROI because of its relation to actual outcomes and not to early interest.
CPA Formula
CPA = Total Campaign Spend/Number of Customers Acquired
Example: With £6,000 spent and 40 customers acquired, your CPA is £150.
Another important point to note is that CPA should not be mixed up with another metric called customer acquisition cost (CAC).
Although CPA usually implies the cost of an individual campaign or channel, CAC includes the entire cost of selling and marketing. Nevertheless, in common speech, people tend to use these metrics interchangeably.
Cost Per Lead Vs Cost Per Acquisition: Side-By-Side Comparison
Here’s a quick side-by-side comparison of CPL vs CPA to help you see exactly where they differ:
| Aspect | Cost Per Lead (CPL) | Cost Per Acquisition (CPA) |
|---|---|---|
|
What It Matters |
Cost to generate one lead |
Cost to convert one paying customer |
|
Funnel Stage |
Early stage |
Late Stage |
|
Who Bears Conversion Risk |
Buyer (you) |
Shared, weighted more towards the provider |
|
Cost Predictability |
Fixed cost per lead, variable cost per customer |
Fixed cost per customer |
|
Best Suited To |
Long or considered sales cycles, B2B nurturing |
Shorter cycles, high-intent purchases |
|
Typical Use Case |
Building a pipeline of prospects to nurture |
Driving a measurable, immediate outcome |
Difference Between CPL and CPA: Risk, Control and Funnel Stage
Main distinctions between CPL and CPA lie in three major factors: the stage of the funnel at which the cost is determined, who holds the responsibility in case the lead does not convert, and the level of control over the outcome.
Funnel Stage
CPL is calculated at the beginning stage, while a prospect still shows interest, and CPA is calculated at the final stage when this prospect becomes a paying customer. It implies that having a low CPL does not always result in a low CPA, as cheap but non-converting leads might be more costly than expensive but rapidly converting ones.
Risk and Control
In the case of CPL, you will pay for the lead anyway, so the risk of non-conversion is yours and is determined by the performance of the in-house sales process, including response rate, quality of follow-up, and nurturing sequences.
In the case of CPA, the cost is paid after customer acquisition, so the risk of conversion is shared, but this usually results in a higher overall cost.
Budget Predictability
With a CPL, you can predict lead generation costs, while a CPA gives you a predictable cost for each qualifying acquisition, but your total spend still depends on how many acquisitions occur. With a CPA, you can predict the cost per customer, but in most cases, it will be higher.
Want to learn about the cost of B2B lead generation? Read ProInteractive’s detailed cost guide.
UK Compliance Considerations For CPL and CPA Campaigns
Whether you choose the CPL or CPA approach to pay for leads, you must ensure that the way these leads are generated complies with the UK’s data protection rules.
- The UK GDPR specifies that consent for marketing purposes must be free, specific, informed, and unambiguous. In addition, it must not be pre-ticked or bundled.
- PECR is another set of data protection rules in the UK that focus on the marketing of products and services via email, SMS messages, or telephone calls. PECR in some cases requires that electronic marketing can only be done after obtaining opt-in consent, as well as providing an opportunity for opt-out.
- Due diligence on third-party leads is expected by UK regulators: if you buy or receive leads from a third party, you’re expected to check that consent was obtained compliantly before you use that data, rather than relying solely on the seller’s word.
- The Information Commissioner’s Office (ICO) is the UK’s data protection authority and has taken enforcement action in cases where organisations have failed to verify the legitimacy of consent before buying and using third-party leads.
The above shows that it is advisable to ask third-party organisations to clarify how the leads are collected and the documentation associated with that process, regardless of whether the organisation is using CPL or CPA.
How To Choose Between CPL and CPA For Your Business?
Just a few questions will help you decide which one is suitable for your business:
- Can the sales team respond to and follow up on leads quickly?
- Is your average customer value high enough to absorb a higher cost per acquisition?
- Do you require a fixed budget for each customer acquired, or are you fine with a fixed cost per lead?
- How long is your typical sales cycle?
Quick Decision Guide:
- A strong in-house sales team + long sales cycle = CPL tends to work well.
- Limited sales capacity + need for cost certainty = CPA tends to work well.
- High customer lifetime value + transactional purchase = CPA is usually worth the premium.
- Building a long-term prospect database = CPL better supports these goals.
Can You Use Both Models?
Absolutely, many companies use CPL and CPA together rather than choosing one model over another. One way to use both would be to use CPL for volume generation and market testing but use CPA (or a CPA-like model) for channels/campaigns where results are more important than volume.
The advantage of using both models is that it diversifies the risks, with CPL keeping costs predictable during the stage when you are building up your pipeline and CPA making sure that your budget is not affected negatively by the higher-value or high-risk channels.
How Can ProInteractive Help?
ProInteractive is a customer acquisition platform that connects businesses with new customer opportunities from a network of marketplaces and published content, all managed through one platform with transparent, ROI-based pricing.
Rather than locking you into a single pricing model, ProInteractive gives you the possibility to see what opportunities are available for you so that you can consider cost, volume, and quality when making decisions about how to invest your budget.
There is no long-term contract; access runs on a simple 30-day rolling basis, with a built-in CRM to help you manage and follow up on every opportunity that comes through the platform.
If you are looking for leads for specific sectors, then see ProInteractive’s detailed guide on lead generation for:
Get Qualified Leads With ProInteractive Today
If you’re ready to explore new customer opportunities without committing to a single rigid pricing model, ProInteractive gives you a transparent, no-fuss way to access qualified opportunities across a range of sectors.
Want to fill your pipeline with qualified leads?
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FAQs
CPL (cost per lead) is the price paid for each lead. CPA (cost per acquisition) is the price paid to turn one lead into a customer. CPL is earlier in the sales funnel than CPA.
Neither model is universally better; the right choice depends on your sales capacity and goals. CPL tends to suit businesses with a strong in-house sales team and a longer sales cycle, while CPA suits businesses that want cost certainty per customer and have less capacity to handle unqualified leads.
Yes. Businesses often utilise both CPL and CPA campaigns to create sales pipelines and test new channels, respectively.
Not always. Low CPL doesn’t automatically mean good value. It is necessary to take into account the conversion rate and CPA when assessing the effectiveness of CPL.
