What Is a Good LTV CAC Ratio for SaaS?
What Is a Good LTV CAC Ratio for SaaS?
The LTV:CAC ratio is the single most important metric for understanding whether your SaaS business can scale profitably. It compares how much revenue a customer generates over their lifetime (LTV) to how much it costs to acquire them (CAC). Get this ratio wrong, and you'll burn through funding while growing.
In this guide, you'll learn how to calculate LTV and CAC correctly, what ratios indicate healthy versus unsustainable businesses, and strategies to improve your numbers. Use our calculator to analyze your unit economics.
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Enter your revenue per customer, churn rate, and acquisition costs to calculate your LTV:CAC ratio and see if your business economics are sustainable.
How It Works: Calculating LTV and CAC
Customer Lifetime Value (LTV):
LTV = (Average Revenue Per Account × Gross Margin) / Customer Churn Rate
Alternative formula:
LTV = ARPA × Gross Margin × Average Customer Lifespan
Customer Acquisition Cost (CAC):
CAC = Total Sales & Marketing Spend / Number of Customers Acquired
The Ratio:
LTV:CAC = LTV / CAC
Industry benchmarks:
Step-by-Step Example: Calculating Your Ratio
Scenario: A SaaS startup with the following metrics:
LTV Inputs:
LTV Calculation:
LTV = ($100 × 0.80) / 0.03 = $2,667
CAC Inputs:
CAC Calculation:
CAC = ($20,000 + $15,000) / 50 = $700
LTV:CAC Ratio:
$2,667 / $700 = 3.81:1
Interpretation: This is a healthy ratio. The company earns $3.81 for every $1 spent on acquisition. However, it takes 8.75 months ($700 / $80 contribution margin) to recoup CAC—reasonable but not exceptional.
Key Factors to Consider
1. Payback Period Matters Too
LTV:CAC doesn't show timing. A 5:1 ratio with 24-month payback is worse than 3:1 with 6-month payback for cash flow. Calculate CAC Payback = CAC / (ARPA × Gross Margin). Under 12 months is excellent.
2. Segment Your Ratios
Aggregate LTV:CAC hides problems. Enterprise customers often have higher LTV but also higher CAC (longer sales cycles). SMB may have lower LTV but faster, cheaper acquisition. Analyze segments separately.
3. Include All Acquisition Costs
CAC should include: paid advertising, content marketing, SDR salaries, sales commissions, marketing tools, event costs, and attributable overhead. Underestimating CAC artificially inflates the ratio.
4. Use Cohort-Based LTV
Don't use company-average churn for new cohort LTV projections if your product has improved. Recent cohorts may have better retention. Conversely, early adopters often have lower churn than later customers.
Frequently Asked Questions
What is a good LTV to CAC ratio?
A 3:1 LTV:CAC ratio is the healthy benchmark for SaaS businesses. This means you earn $3 for every $1 spent acquiring customers. Below 3:1 suggests inefficiency; above 5:1 may indicate under-investment in growth.
How do you calculate LTV in SaaS?
LTV = Average Revenue Per Account (ARPA) × Gross Margin / Monthly Churn Rate. For example, $100 ARPA × 80% margin / 3% churn = $2,667 LTV. This represents expected gross profit from a customer over their lifetime.
What is a good CAC for SaaS?
"Good" CAC depends on your LTV. If LTV is $3,000, CAC of $1,000 is excellent (3:1 ratio). If LTV is $500, that same $1,000 CAC is fatal. Focus on the ratio, not absolute CAC. For B2B SaaS, CAC typically ranges from $500-$5,000.
Why is LTV CAC ratio important?
LTV:CAC tells you if customer acquisition is profitable. A ratio below 1:1 means you lose money on every customer. Above 3:1 indicates sustainable unit economics that support growth. VCs scrutinize this ratio heavily in due diligence.
How can I improve my LTV CAC ratio?
Improve LTV by: reducing churn (better onboarding, customer success), increasing ARPA (upsells, pricing increases), and improving gross margins. Reduce CAC by: optimizing ad spend, improving conversion rates, leveraging organic/referral channels.