LTV vs CAC: What's the Difference?
Understand how Customer Lifetime Value and Customer Acquisition Cost work together to determine SaaS unit economics and profitability.
Key Takeaways
- LTV estimates the total revenue a customer generates over their entire relationship with your business.
- CAC measures the total cost of acquiring a single new customer including marketing and sales expenses.
- A healthy SaaS business typically targets an LTV to CAC ratio of three to one or higher.
What is LTV?
Customer Lifetime Value (LTV) estimates the total revenue a business can expect from a single customer account over the duration of the relationship. It is calculated by multiplying average revenue per account by gross margin, then dividing by the churn rate. LTV helps SaaS companies understand how much a customer is worth long-term, guiding pricing and retention investment decisions. African subscription businesses use LTV to justify customer acquisition spending in markets where payback periods may be longer due to lower starting price points.
What is CAC?
Customer Acquisition Cost (CAC) measures the average expense of converting a prospect into a paying customer. It is calculated by dividing total sales and marketing costs by the number of new customers acquired in a period. CAC includes advertising spend, sales team salaries, software tools, and onboarding costs. For African SaaS companies, CAC can vary dramatically between markets. Acquiring enterprise clients in Lagos or Nairobi through direct sales teams costs significantly more than acquiring SMEs through digital self-serve channels.
Key differences
LTV looks forward to estimate future customer value while CAC looks backward at acquisition investment. LTV is influenced by retention, pricing, and expansion revenue; CAC is driven by marketing efficiency and sales productivity. The LTV to CAC ratio is a critical health indicator. A ratio below one means you spend more to acquire customers than they generate. A ratio above three is generally considered healthy, giving enough margin to cover operational costs and generate profit.
When to use each
Use LTV to set maximum acquisition budgets, prioritise high-value customer segments, and evaluate pricing changes. Use CAC to optimise marketing channels and sales processes. African fintech companies like those in the mobile money space often find that digital acquisition channels deliver lower CAC than traditional sales, while enterprise segments produce higher LTV. Balancing these metrics across segments helps allocate resources efficiently in diverse, multi-country growth strategies.