CPL: Cost Per Lead
The cost of generating one marketing lead through paid advertising.
Formula
Why it matters
CPL is the primary efficiency metric for lead generation campaigns. It measures the top-of-funnel cost before conversion — useful for comparing channel efficiency when the sales cycle is long.
How to improve CPL
Test lead magnet quality, optimise form length (fewer fields = higher conversion rate), improve landing page clarity, and refine audience targeting to attract higher-intent prospects.
Highly variable by industry. B2B SaaS: $20–$200. E-commerce: $5–$30. Financial services: $50–$500.
Prooflytics tracks CPL automatically from your connected sources and flags it in your daily briefing when it moves significantly.
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Calculate CPL from spend and leads
Cost Per Lead
CPL = Ad Spend ÷ Leads
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Frequently asked questions
What is a good cost per lead?
A good CPL depends on your average deal size and close rate. A $100 CPL is excellent if your average deal is $10,000; it is unsustainable if your average deal is $200. Rule of thumb: CPL × (1 / close rate) should be well below your average deal value.
How is CPL different from CPA?
CPL measures the cost to generate a lead (contact who expressed interest). CPA measures the cost to convert that lead into a paying customer. B2B teams track both to understand funnel efficiency.