Lead Source Analyzer
Free cost-per-lead calculator for B2B teams — compare CPL and conversion rates across every channel to find which ones are generating real pipeline and which are burning budget.
Your Channels
Channel
Marketing channel name
Monthly Spend
What you spend per month on this channel. If billed annually, divide by 12.
Leads Generated
Leads this channel produced this month — form fills, demo requests, signups.
Google Ads
SEO / Content
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How to Audit Your Lead Sources by True Cost Per Lead
Cost per lead (CPL) is one of the most misused metrics in B2B marketing. Most teams calculate it as total spend divided by total leads — a blended figure that hides enormous variation between channels. A campaign generating 500 leads at $80 CPL through LinkedIn may be far more valuable than one generating 1,000 leads at $40 CPL through broad display, if the LinkedIn leads close at a 5× higher rate.
The correct approach is to calculate CPL at the channel level and combine it with downstream conversion data. An $80 CPL that produces $15,000 ACV deals with a 30% close rate generates $4,500 in revenue per lead. A $20 CPL that produces $5,000 ACV deals with a 5% close rate generates only $250. The "cheap" channel is 18× less valuable per dollar spent.
For most mid-market B2B organisations, the highest-CPL channel is frequently also the highest-revenue channel. The goal of a lead source audit is not to find the cheapest leads — it is to find the leads worth paying for, and to stop subsidising the channels that cannot prove their downstream contribution to closed-won revenue.
$30–60
Healthy Blended B2B CPL Benchmark
3–7%
Average Website Visit-to-Lead Rate
40–55%
High-Performance Lead-to-MQL Rate
What is your biggest revenue challenge today?
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