Customer Acquisition Cost (CAC)
Measuring the efficiency of your sales and marketing growth engine.
Customer Acquisition Cost (CAC) measures the efficiency of a business's growth engine. It represents the average total sales and marketing spend required to bring one new customer through the door.
Understanding CAC is essential for evaluating business sustainability. If acquiring a customer costs more than the customer ever pays, the business is fundamentally unprofitable.
Key Takeaways
- •Growth Efficiency: Lower CAC indicates highly efficient marketing and sales channels.
- •Full Inclusion: CAC must include advertising spend, software tools, and sales team salaries.
- •The LTV Metric: CAC must always be evaluated relative to Customer Lifetime Value (LTV).
Core Concepts & Definitions
1Fully Loaded CAC
A proper CAC calculation must account for salaries, overheads, and tool costs, not just raw advertising spend.
•Direct Ad Spend: Google Ads, Facebook Ads, etc.
•Indirect Costs: Marketing software, sales commission, and base salaries.
2CAC Payback Period
The amount of time (usually months) it takes for a customer to generate enough gross margin to recover their acquisition cost.
•A shorter payback period (e.g. <12 months) increases cash flow and reduces growth risk.
Equations & Calculation Methods
Basic CAC Calculation
Divides all acquisition costs by the number of new customers acquired during the same period.
Step-by-Step Worked Examples
Example 1: Calculating Fully Loaded CAC
Problem: A startup spends $10,000 on Google Ads, $5,000 on tools, and pays two sales reps $5,000/mo each. They acquire 100 new customers in that month. What is the CAC?
Step-by-step Solution:
- 1Sum all acquisition expenses: $10,000 (ads) + $5,000 (tools) + $10,000 (salaries) = $25,000.
- 2Divide total expenses by customers acquired: $25,000 / 100 = $250.
Topic FAQ
For early-stage startups, a payback period under 12 months is considered healthy. Enterprise SaaS companies can afford longer payback periods (up to 18-24 months) due to higher customer retention.
CAC/LTV Unit Economics Studio
Calculate customer acquisition costs and model payback periods.
Adjust Inputs
Calculated Results
Customer Value (LTV) vs Acquisition Cost (CAC)
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Frequently Asked Questions
For early-stage startups, a payback period under 12 months is considered healthy. Enterprise SaaS companies can afford longer payback periods (up to 18-24 months) due to higher customer retention.