Calculate the total cost of winning a new customer to evaluate marketing efficiency and ensure sustainable unit economics across all channels.
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Customer Acquisition Cost (CAC) is a metric that measures how much money you spend, on average, to gain one new customer. It's calculated by taking your total sales and marketing spending over a period and dividing it by the number of new customers acquired during that period. If you spent £100,000 on sales and marketing in a quarter and acquired 50 new customers, your CAC is £2,000.
CAC is one of the most important metrics for B2B growth because it directly impacts business profitability and growth sustainability. A business that acquires customers at a lower cost has more room for profit, more flexibility to invest in product development, and more resilience to market downturns.
CAC varies dramatically by business model. A self-serve SaaS with low-touch sales might have CAC of £500-2,000. An enterprise software company with long sales cycles might have CAC of £50,000-200,000. The key is whether your CAC is sustainable given your pricing and gross margins.
B2B growth teams live and die by CAC. If your CAC is £10,000 but your average customer lifetime value is £30,000, you have room to grow profitably. If your CAC is £10,000 but your LTV is £12,000, you have very thin margins and any increase in customer churn or decrease in average deal size could destroy profitability.
Understanding your CAC helps you make investment decisions. Should you hire more sales people? Increase advertising spend? Build more content? The answer partly depends on your CAC and whether you can improve it. If your CAC is trending upward, you need to diagnose why: are customers becoming harder to acquire, or are you targeting less-qualified markets?
CAC also reveals channel efficiency. If you calculate CAC by marketing channel, you might discover that content marketing delivers customers at £3,000 CAC while paid advertising delivers at £8,000 CAC. This doesn't mean you should eliminate paid advertising - those channels might deliver customers at different lifecycle values or risk profiles - but it informs your strategy.
Calculate your CAC regularly - monthly, quarterly, and annually. Set targets for what CAC should be given your pricing and desired margins. A common rule of thumb is that your CAC should be paid back within 6-12 months through gross profit from that customer. If your average contract value is £5,000 per year with 70% gross margin, your CAC should ideally be under £3,500.
Segment your CAC by channel and cohort. What's the CAC for customers acquired through your website versus LinkedIn versus referrals? Which customer segments have the best unit economics? A customer from a referral might have £2,000 CAC; a customer from enterprise sales might have £15,000 CAC. Understanding these differences guides your strategy.
Measure CAC payback period: how long does it take for a customer to generate enough profit to cover the cost of acquiring them? If your payback period extends beyond 24 months, your business won't grow sustainably. Conversely, if your payback period is 6 months, you can reinvest profits quickly to fuel growth.
A B2B software company tracked CAC by source. Content marketing delivered customers at £4,200 CAC with 18-month payback. LinkedIn advertising delivered at £6,800 CAC with 24-month payback. Enterprise sales delivered at £35,000 CAC with 30-month payback. The company increased content and demand generation investment, reduced reliance on enterprise sales, and improved overall CAC to £5,600 while maintaining revenue growth.
A services company calculated CAC of £8,000 with 18-month payback. They implemented marketing automation and improved lead qualification, reducing the time from lead to opportunity from 8 weeks to 4 weeks. This allowed their sales team to sell more efficiently, and CAC improved to £6,500 without changing marketing spend. The efficiency gain alone improved business economics.
A consulting software company discovered that CAC varied dramatically by industry vertical. Financial services companies cost £12,000 to acquire but had 3-year average contracts. Manufacturing companies cost £7,000 to acquire but had 1.5-year contracts. This analysis revealed that the apparently 'expensive' financial services vertical was actually more profitable. The company shifted focus to that vertical and improved overall unit economics.
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Paul Jarvis
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