CAC
Also known as: Customer Acquisition Cost, Cost per acquired customer
Quick definition
CAC (Customer Acquisition Cost) is the total cost to acquire one new paying customer — calculated as total sales + marketing spend divided by new customers acquired in the same period. CAC is one of the most important business metrics; the relationship between CAC and customer lifetime value (LTV) determines unit economics, marketing budget viability, and growth trajectory.
What is CAC?
CAC (Customer Acquisition Cost) is the average cost to acquire one new paying customer in a given time period. The standard calculation: sum of all sales + marketing expenses (paid ads, content production, salaries, tools, agency fees) divided by the number of new customers acquired in the same period. A SaaS company spending $100K on sales + marketing in a quarter and acquiring 200 new customers has CAC of $500.
CAC is universally important because it sets the floor on what customers must be worth to make the business viable. If your CAC is $500 and your average customer pays $300 over their lifetime, you're losing $200 per customer — the business doesn't work. CAC must be lower than LTV (lifetime value) by a meaningful margin for unit economics to be healthy. The widely-cited rule: LTV/CAC > 3 indicates healthy economics; LTV/CAC < 2 is concerning.
Channel-level CAC for social marketing
Different acquisition channels produce dramatically different CAC. (1) Paid social (Meta Ads, TikTok Ads, LinkedIn Ads) — easy to measure but typically high CAC ($50-500+ for B2C, $500-5000+ for B2B). (2) Organic social — harder to measure (attribution problems) but often dramatically lower effective CAC because content compounds over time. (3) Influencer marketing — varies wildly; mid-tier creators ($5-20 CAC for B2C consumer products), top creators ($50-200+ CAC). (4) SEO / content marketing — high time-investment but compounds; effective CAC often drops to $10-50 over time. (5) Word of mouth / referral — typically lowest CAC ($0-50) but limited scalability.
Mature marketing programs measure CAC by channel and continuously rebalance budgets toward lower-CAC channels with sufficient volume. The rebalancing decision involves both CAC and absolute volume — a $10 CAC channel that only delivers 5 customers/month is less useful than a $50 CAC channel that delivers 500.
Common pitfalls
- ×Calculating CAC without including all costs (overhead, tools, salaries) — undercounts the true number
- ×Ignoring blended CAC across channels — channel-level measurement reveals which channels are economic
- ×CAC creep — same channel produces same volume but at increasing cost over time, a sign of saturation
- ×Optimizing CAC at the expense of customer quality — cheap customers often have low LTV
- ×Treating CAC as static — CAC fluctuates with market conditions, seasonality, competition
Tips
- ✓Track LTV/CAC ratio as the primary unit-economics health metric — target > 3
- ✓Measure CAC by channel separately — different channels have wildly different CACs
- ✓Track CAC trend monthly — increases signal saturation or competitive pressure
- ✓Include all costs (overhead, salaries, tools) for accurate CAC — not just paid ad spend
- ✓Optimize for blended CAC by rebalancing budget away from saturated high-CAC channels
Frequently asked questions
What's a good CAC?+
Depends on category and LTV. Good CAC = LTV/CAC > 3. A B2B SaaS with $10K LTV can afford $3K CAC. A B2C product with $100 LTV needs CAC under $30. Measure relative to LTV, not absolute.
How do I calculate CAC for organic social?+
Estimate the labor cost of producing organic content + amortize over customers attributed to organic. Imperfect but directionally useful. Most teams accept some attribution fuzziness for organic channels.
What's payback period vs CAC?+
Payback period = months to recover CAC from customer revenue. A $500 CAC customer paying $50/month has 10-month payback. Both CAC and payback period matter — short payback periods improve cash flow even if LTV/CAC is healthy.
Does CAC include sales team salaries?+
Yes — CAC should include all sales + marketing costs (people, tools, ads, agencies). Excluding salaries undercounts the true acquisition cost.
How can social media reduce CAC?+
Organic content compounds over time, dramatically reducing effective CAC for content-driven channels. Influencer + creator partnerships often deliver lower CAC than paid ads. Cross-platform content distribution amortizes production cost across more impressions.
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