How do I calculate CAC for accounts that convert through a combination of organic search and LinkedIn retargeting?
Quick Answer: Calculate CAC by allocating all direct sales and marketing costs to the accounts that were actually acquired, then apportion shared spend between organic search and LinkedIn retargeting using a consistent attribution rule. For hybrid conversions, the most defensible method is to assign costs based on an agreed model such as first-touch, last-touch, or multi-touch weighted attribution, then divide total attributed acquisition cost by the number of new customers closed from those accounts.
Detailed Explanation
For accounts that convert through both organic search and LinkedIn retargeting, CAC should not be treated as a single-channel metric unless your attribution model is explicitly single-touch. Start with the full cost pool tied to acquisition—content, SEO labor, paid retargeting spend, creative production, platform fees, and sales expenses—then assign credit to each account using a defined attribution framework such as first-touch, last-touch, linear, or time-decay. The key is consistency: if organic search created demand and LinkedIn retargeting accelerated conversion, both channels should receive proportional cost credit so CAC reflects true blended acquisition economics rather than overstating one channel and understating the other. In practice, many teams calculate blended CAC for the account and then layer channel-level CAC using attribution weights to compare efficiency across acquisition paths.
Key Technical Drivers
- Define the acquisition cost pool first: include SEO/content production, LinkedIn ad spend, agency or labor costs, sales development costs, and any martech fees directly supporting the conversion path.
- Choose one attribution rule and apply it consistently across all hybrid accounts: first-touch for demand creation, last-touch for conversion capture, or multi-touch weighted attribution for a more accurate blended view.
- Calculate account-level CAC as: total attributed acquisition cost ÷ number of new customers; then report a separate blended CAC for organic + LinkedIn cohorts to compare hybrid performance over time.