What is LTV:CAC Ratio Calculator?
The LTV:CAC Ratio Calculator helps businesses measure the efficiency of their customer acquisition.
When to Use This Calculator
- Checking whether your customer acquisition spend is sustainable relative to what customers are worth
- Deciding whether to increase or pull back marketing and sales spend
- Comparing acquisition efficiency across channels or customer segments
- Reporting growth efficiency to investors alongside raw growth rate
- Setting a minimum acceptable ratio before approving new acquisition budget
- Diagnosing whether a growth slowdown should be solved with more spend or better retention
Steps:
- Enter customer lifetime value.
- Input customer acquisition cost.
- View ratio and health assessment.
Formula
LTV:CAC Ratio = Customer Lifetime Value ÷ Customer Acquisition Cost
Use Cases
- Investor reporting
- Marketing optimization
- Growth planning
Key Benefits
- Customer acquisition cost precise from spend
- Understand marketing and sales efficiency
- LTV to CAC ratio health check
- Optimize ad spend for profit
Pro Tips
- Include salaries tools overhead in CAC
- Benchmark LTV CAC 3:1 or higher
- Track by channel for optimization
Common Mistakes to Avoid
- Including all costs not just ad spend
- CAC without LTV incomplete picture
- Monthly average not blended across channels
Key Terms Explained
- CAC: Cost to acquire each customer
- LTV: Lifetime value from customer
- CAC Payback: Months to recover CAC
- Blended CAC: Average across all channels
Related Concepts
- CAC Payback Period: LTV:CAC shows the total lifetime return, while payback period shows how fast you recover the initial spend — check the speed dimension with our CAC payback period calculator.
- Subscription Revenue: Customer lifetime value in this ratio comes directly from ARPU and churn — see how those combine with our subscription revenue calculator.
- Churn Impact: Since churn heavily drives LTV, understand its direct dollar cost with our churn impact calculator before deciding whether to fix retention or acquisition.
- Unit Economics: For a fuller margin-aware view beyond the simple LTV:CAC ratio, our unit economics calculator factors in gross margin and payback schedule together.
- CAC Calculator: To see exactly how your acquisition cost is calculated across channels before it feeds into this ratio, use our CAC calculator.
Example
With $1,000 LTV and $300 CAC, your ratio is 3.33:1, which is considered excellent.
Interpreting Your Results
The LTV:CAC ratio compares what a customer is worth over their lifetime against what it cost to acquire them — a ratio of 3:1 or higher is the widely-used benchmark for a healthy, sustainable SaaS business, meaning every dollar spent on acquisition returns at least three dollars in lifetime value. A ratio below 1:1 means you're losing money on every customer acquired, a genuine crisis that needs immediate attention. A ratio well above 5:1 or 6:1 might look great at first glance but often actually signals under-investment in growth — if customers are worth that much more than they cost to acquire, spending more on acquisition would likely still be profitable and could accelerate growth. Because this ratio depends on both LTV (driven heavily by churn) and CAC (driven by acquisition efficiency), a weak ratio can be fixed from either side — improving retention to raise LTV, or improving acquisition efficiency to lower CAC — and it's worth diagnosing which lever is the real problem before reacting.