What is CAC?
Customer Acquisition Cost — the total cost of acquiring a new customer, including marketing spend, sales costs, and related overhead, calculated by dividing total acquisition costs by the number of new customers.
Understanding the Details
CAC measures the efficiency of your growth engine. It includes all costs associated with acquiring customers: marketing spend, sales salaries and commissions, tools, and overhead. The fully-loaded CAC (including all relevant costs) is more useful than just marketing spend per customer. CAC varies significantly by channel, customer segment, and sales motion — an enterprise deal closed by an AE after a 6-month cycle has very different CAC than a self-serve signup from organic search. Understanding CAC by segment enables strategic decisions about where to invest for growth. The relationship between CAC and LTV determines the fundamental viability of your business model.
How It Works in Practice
Blended CAC calculation
Monthly marketing spend of £50K plus sales costs of £80K, divided by 40 new customers, yields a blended CAC of £3,250.
Channel-level CAC
Content marketing delivers customers at £800 CAC while paid advertising costs £3,500 per customer, informing budget reallocation.
CAC payback analysis
With £2,000 CAC and £300 monthly revenue per customer at 70% gross margin, payback period is approximately 10 months.
Why It Matters
CAC determines whether your growth investments are profitable. If it costs more to acquire a customer than they'll ever pay you, growth accelerates losses rather than building a business.
What People Often Get Wrong
Lower CAC is always better. Actually, extremely low CAC might indicate underinvestment in growth or attracting low-value customers.
CAC should be calculated as a single number. Actually, segment-level and channel-level CAC reveal where your acquisition is efficient and where it's wasteful.
CAC is purely a marketing metric. Actually, sales costs often dominate CAC, especially in enterprise and mid-market motions.
How We Handle CAC
We help optimise CAC by improving conversion rates across the funnel, reducing wasted spend, and building organic channels that lower blended acquisition costs over time.
Common Questions
Need Help With CAC?
If you'd like to discuss how cac applies to your business, we're happy to explain further.