Quick Definition
Customer Acquisition Cost (CAC) is a fundamental business metric that measures the average cost of acquiring a new customer. CAC is calculated by dividing total sales and marketing costs (including salaries, advertising, tools, events, and other acquisition-related expenses) by the number of new customers acquired in the same period. CAC is critical for understanding the economics of customer acquisition and evaluating whether acquisition costs are sustainable relative to customer lifetime value (LTV). Note: CAC and Customer Acquisition Cost are synonymous terms: both refer to the same metric. The abbreviation CAC is more commonly used in practice.
Why It Matters
CAC is critical for B2B companies because it directly impacts profitability and growth sustainability. If CAC is too high relative to LTV, the business model is unsustainable. If CAC is too low, the company may be underinvesting in growth. CAC enables companies to: evaluate the efficiency of acquisition efforts, compare performance across channels and campaigns, forecast growth and budget requirements, and make informed decisions about scaling acquisition efforts. For B2B SaaS companies, CAC is particularly important because it determines payback period and impacts cash flow.
How It Works
CAC is calculated using the formula: CAC = Total Sales and Marketing Costs / Number of New Customers Acquired. The numerator includes all costs associated with acquiring customers: sales team salaries and commissions, marketing team salaries, advertising spend, marketing tools and software, events and sponsorships, content creation costs, and other acquisition-related expenses. The denominator is the number of new customers acquired in the same period (typically monthly, quarterly, or annually). CAC should be calculated consistently over time to track trends and compare performance.
Real-World B2B Example
A B2B SaaS company selling project management software calculates CAC: total sales and marketing costs for Q1 are $300,000 (including $150K in salaries, $100K in advertising, $30K in tools, $20K in events), and they acquire 50 new customers in Q1. CAC = $300,000 / 50 = $6,000 per customer. The company compares this to their LTV of $30,000, resulting in a LTV:CAC ratio of 5:1, which is healthy. They track CAC monthly to identify trends and optimize acquisition efforts.
Common Use Cases
- Evaluating acquisition efficiency
- Comparing performance across channels
- Forecasting growth and budget requirements
- Evaluating business model sustainability
- Making scaling decisions
- Benchmarking against industry peers
Common Mistakes to Avoid
- Not including all acquisition costs in the numerator
- Using inconsistent time periods for numerator and denominator
- Not segmenting CAC by channel, campaign, or customer segment
- Comparing CAC without considering LTV
- Not tracking CAC trends over time
Frequently Asked Questions
Is CAC the same as Customer Acquisition Cost?
Yes, CAC and Customer Acquisition Cost are the same metric. CAC is simply the abbreviation. Both refer to the average cost of acquiring a new customer.
What should be included in CAC calculation?
Include all sales and marketing costs: sales team salaries and commissions, marketing team salaries, advertising spend, marketing tools and software, events and sponsorships, content creation costs, and other acquisition-related expenses. Exclude costs not directly related to acquisition (like customer success).
What is a good CAC?
There is no universal "good" CAC: it depends on LTV, industry, and business model. The key metric is LTV:CAC ratio. A ratio of 3:1 or higher is generally considered healthy. Compare CAC to LTV, not to arbitrary benchmarks.