Customer Acquisition Cost (CAC) — Plain English Definition + Examples

Definition

Customer Acquisition Cost (CAC) is the total sales and marketing spend required to acquire one new customer — calculated as (sales + marketing spend in a period) ÷ (new customers acquired in that period), measured monthly, quarterly, or annually.

In day-to-day European MICE and procurement work, customer acquisition cost (cac) sits inside a broader workflow that includes the brief, the longlist, the shortlist, the contract negotiation, and the post-event reconciliation. Understanding it in isolation is not enough — what matters is how it interacts with the other levers a planner or procurement team can pull. The definition above is the textbook version; the sections below explain how it actually behaves in real sourcing.

Why Customer Acquisition Cost (CAC) matters

CAC is half of the SaaS unit-economics equation (the other half is customer lifetime value). For MICE buyers evaluating a SaaS vendor's long-term viability, the CAC payback period is a leading indicator. A vendor whose CAC is recovered in 12 months is durable; one whose CAC takes 36 months is exposed.

The practical takeaway: planners and procurement teams who get customer acquisition cost (cac) right typically see measurable improvements in either cost, risk exposure, or cycle time — sometimes all three. Teams who default to the supplier's standard language usually leave 5-15% of total event value on the table, often without realizing it. The skill is recognising customer acquisition cost (cac) when it appears, knowing the market-standard range, and treating any deviation from that range as a negotiation point — not a take-it-or-leave-it.

Example

A sourcing platform spent €420k on sales and marketing in Q1, acquiring 38 new customers. CAC = €420k ÷ 38 = €11,053. At an average ACV of €5,800, CAC payback period = €11,053 ÷ (€5,800 × gross margin 80%) = ~28 months. Borderline healthy.

This example is representative of mid-to-large European corporate MICE — pharma, finance, tech, professional services. Smaller events (under 50 attendees) and very large events (1,000+) often follow different conventions, but the underlying logic of customer acquisition cost (cac) stays the same. The numbers move, the principle doesn't.

Where Customer Acquisition Cost (CAC) appears in contracts

Vendor due diligence rarely covers CAC directly, but CAC payback period (the time it takes to recover CAC through gross-margin contribution) is a useful proxy for vendor sustainability. SaaS benchmark: payback under 12 months is excellent, 12-18 months is healthy, 24+ months is concerning.

When reviewing a hotel proposal or contract draft, scan for customer acquisition cost (cac) early — it's often easier to negotiate before the supplier has anchored on their preferred position. Easy RFP surfaces these terms in every comparison view so planners can spot deviations from market-standard ranges at a glance, rather than reading 14-page proposals line by line.

Related terms

Deeper reading