What is the formula for blended CAC when I include media spend, sales salaries, tools, and agency fees?
Quick Answer: Blended CAC is calculated as total acquisition cost divided by the number of new customers acquired in the same period: CAC = (media spend + sales salaries + sales tools + agency fees + other attributable acquisition costs) / new customers. If you want a true blended view, include only expenses tied to acquisition activity and align all inputs to the same time window and customer conversion lag.
Detailed Explanation
Blended CAC measures the all-in cost to acquire one customer across every acquisition channel and supporting function, which makes it more decision-useful than media-only CAC. The standard formula is the sum of all attributable acquisition expenses—paid media, sales payroll allocated to acquisition, CRM and sales tooling, agency retainers, creative production, and other campaign-specific costs—divided by the number of new customers acquired during the same period. To keep the metric accurate, use consistent accounting boundaries, exclude post-acquisition servicing costs, and account for attribution lag so spend and conversions are matched in the correct reporting window.
Key Technical Drivers
- Formula: Blended CAC = (media spend + allocated sales salaries + tools/software + agency fees + other acquisition costs) / new customers acquired.
- Use only costs directly attributable to customer acquisition; do not include fulfillment, customer success, or general overhead unless you intentionally allocate a portion to acquisition.
- Match the spend period to the conversion period, especially if your sales cycle is long; otherwise CAC will be distorted by timing mismatch.