B2B Blended CAC by Channel 2027 Calculator

Why Blended CAC Misleads

Blended CAC is the headline number reported to boards — total GTM spend ÷ total customers acquired. But it masks channel-level inefficiency. A $1,500 blended CAC could hide a paid channel with $4,000 CAC and a referral channel with $400 CAC. The optimization play is always at the channel level — kill or fix the worst-performing channels rather than averaging them into the blend.

Channel CAC Math

Channel CAC = total channel cost (ads + tooling + headcount + tools) ÷ customers attributed. Attribution model matters: first-touch attributes to the channel that introduced the customer; last-touch attributes to the channel that closed; multi-touch divides proportionally. For early-stage companies, last-touch is usually sufficient. For mature companies, multi-touch reveals which channels are influencers vs closers.

CAC by Channel Patterns

Typical ranges in B2B SaaS: Referrals $300-1,500 CAC (lowest, capacity-limited). Content/SEO $800-3,000 (medium, scales but slow). Paid ads $1,500-8,000 (highest, scales fast). SDR outbound $3,000-15,000 (high, scalable with headcount). Partnerships $500-3,000 (low when working, high if partners don't convert). Each channel has different scale curves — paid scales fast then degrades; content scales slowly but builds compounding moat.

When to Kill a Channel

Kill a channel when (a) channel CAC > LTV / 3 (unhealthy unit economics) AND (b) channel CAC has not improved in 6+ months despite optimization. Channels with high CAC but high LTV (enterprise SDR) may still pencil. Channels with low CAC but low LTV (free-tier conversions to small-ticket plans) may need lifecycle redesign before killing. Don't kill based on one month's data — channel CAC often fluctuates.

Sources: openview.com SaaS CAC benchmarks 2026, hubspot.com CAC metrics. Last updated: May 2026.