CPL (Cost Per Lead).

Cost Per Lead (CPL) is calculated by dividing total ad spend by the number of leads generated in a given period. A lead is typically a prospect who has submitted contact details, requested a demo, downloaded gated content, or completed another qualifying action indicating sales readiness.

CPL in Paid and Organic Channels

CPL is most commonly tracked in paid search, paid social, and display campaigns. But it can also be calculated for content marketing, SEO, and email—dividing total channel cost (content creation, tools, headcount) by leads attributable to that channel. Comparing CPL across channels informs budget allocation decisions.

CPL and Customer Acquisition Cost

CPL is an upstream metric of Customer Acquisition Cost (CAC). Not all leads convert to customers; the lead-to-close rate must be applied to CPL to derive CAC. A low CPL paired with a low close rate may be worse than a higher CPL with high close rate if the resulting CAC is unfavourable.