Contents
- CPL divides spend by the number of leads generated.
- It says nothing about lead quality: two campaigns at the same CPL can have close-rates that differ threefold.
- The only CPL that counts is the one measured against customer acquisition cost, once the sales close-rate is applied.
Definition
CPL, cost per lead, measures what one lead costs on average: a submitted form, an inbound call, a qualified download.
Formula
CPL = total cost divided by number of leads, over the same period.
Worked example
A campaign spends €4,000 and generates 80 forms: CPL is €50. If the sales team closes one lead in six and customer value is €1,500, customer acquisition cost comes to €300. A second campaign at a €30 CPL but closing one lead in twenty gives a €600 cost per customer: it costs twice as much despite the lower CPL.
Orders of magnitude
In B2B, observed CPLs commonly range from €30 to €150 on Google Ads, and appreciably more on LinkedIn Ads, where targeting is sharper and CPC structurally higher. In B2C local services, CPLs of €15 or €25 are frequent. These gaps reflect customer value, not campaign performance.
The most common mistakes
- Steering on CPL without measuring the close-rate. It is the surest way to optimise towards low-quality volume. The form's conversion rate says nothing about the commercial quality of the contact.
- Comparing a Google Ads CPL to a LinkedIn CPL. The two do not capture the same maturity of intent.
- Counting leads twice. One contact filling in two forms counts twice unless deduplication happens in the CRM.
Where to find the metric
In Google Ads, the Cost per conversion column, isolating the conversion action matching the form. In Meta, Cost per lead on lead generation campaigns. In LinkedIn Ads, the Cost per lead column, fed by Lead Gen Forms. In the CRM, by matching media cost against contacts created, the only way to get a deduplicated CPL.
Frequently asked questions
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