Calculate Customer Lifetime Value, LTV:CAC ratio, and assess the health of your unit economics. Free tool with SaaS industry benchmarks.
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Enter your ARPU to calculate LTV
Add churn rate or lifespan for accurate results
Customer Lifetime Value (LTV) measures the total revenue a business expects from a single customer over their entire relationship. For SaaS companies, the standard formula is LTV = ARPU / Monthly Churn Rate. A healthy business targets an LTV:CAC ratio of at least 3:1, meaning every dollar spent acquiring a customer returns three dollars in lifetime gross profit.
According to Harvard Business Review, acquiring a new customer costs 5-25 times more than retaining an existing one, and increasing customer retention by just 5% can increase profits by 25-95%. This makes LTV essential for sustainable growth in any recurring revenue business.
David Skok of Matrix Partners established that the LTV:CAC ratio should be at least 3:1 for a fundable SaaS business, with the ideal range being 3x-5x. The median B2B SaaS LTV:CAC ratio sits at approximately 3.2:1, and companies with multi-dimensional pricing show 34% higher LTV:CAC ratios than those using flat pricing models.
When paired with Customer Acquisition Cost (CAC), churn rate analysis, and ARR tracking, LTV forms the foundation of unit economics that every recurring revenue business must master.
| Segment | Typical LTV | Monthly Churn | Avg. Lifespan |
|---|---|---|---|
| SMB SaaS | $15K-$40K | 3-7% | ~24 months |
| Mid-Market SaaS | $80K-$200K | 1-2% | ~50 months |
| Enterprise SaaS | $300K-$1M+ | 0.5-1% | 120+ months |
| E-commerce / DTC | $300+ | 6-10% | ~12 months |
| Consumer Subscription | $100-$500 | 5-8% | ~15 months |
Sources: ChartMogul SaaS Benchmarks, ForEntrepreneurs
To calculate Customer Lifetime Value, divide your monthly ARPU by your monthly churn rate. For gross-margin-adjusted LTV, multiply by your gross margin percentage. Example: $100 ARPU with 3% monthly churn and 80% gross margin yields a gross-margin LTV of $2,667. Pair this with your CAC to assess unit economics health.
LTV = ARPU x Customer Lifespan
Where ARPU is Average Revenue Per User per month and Customer Lifespan is in months.
LTV = ARPU / Monthly Churn Rate
This formula derives lifespan from churn. If churn is 5% monthly, lifespan = 1/0.05 = 20 months.
LTV = (ARPU x Gross Margin %) / Monthly Churn Rate
Accounts for the cost of serving customers. More accurate for unit economics analysis.
Your average monthly subscription revenue per customer. Calculate by dividing total monthly recurring revenue (MRR) by total active customers. Include upsells and add-ons for accuracy.
The percentage of customers who cancel each month. Calculate as: (Lost Customers / Starting Customers) x 100. Use a consistent cohort view for detailed analysis.
Revenue minus cost of goods sold (hosting, support, infrastructure). Most SaaS companies target 70-85% gross margin. Higher margins mean more profit from each customer.
Total sales and marketing spend divided by new customers acquired. Essential for LTV:CAC ratio calculation. Use a fully-loaded CAC model to compute this metric accurately.
The LTV:CAC ratio is the primary measure of SaaS unit economics health. A ratio below 1:1 means you lose money on every customer. The 3:1 target means you earn $3 in lifetime gross profit for every $1 spent on acquisition. The median B2B SaaS LTV:CAC ratio is 3.2:1, with best-in-class companies achieving 3.8:1 and median CAC payback periods of 8.6 months.
The LTV:CAC ratio answers the question: "For every dollar spent acquiring customers, how many dollars do we earn back?" Use this alongside your burn rate and runway to ensure acquisition spending is sustainable.
You lose money on every customer acquired. Immediate action needed: reduce CAC, improve retention, or increase prices. Not sustainable without significant changes.
Marginally profitable but leaves little room for error or investment. Focus on improving retention and reducing churn before scaling acquisition.
The target range for most SaaS businesses. Provides enough margin for growth investment while maintaining profitability. VCs consider this a fundable business.
Very efficient unit economics. May indicate under-investment in growth. Consider increasing marketing spend to accelerate customer acquisition while maintaining ratio above 3:1.
LTV varies dramatically by business model. A B2B SaaS product at $79/month with 3% churn has an LTV of $2,631 and a 33-month customer lifespan. A consumer subscription box at $35/month with 8% churn has an LTV of just $438 but can still achieve healthy 4.4x LTV:CAC through low acquisition costs. Enterprise B2B services can exceed $250,000 LTV with sub-2% monthly churn.
A B2B SaaS company charges $79/month with 80% gross margin. Monthly churn is 3% and CAC is $800 through content marketing and paid ads.
The 2.6x ratio is slightly below the 3:1 target. To improve, the company should focus on reducing churn through better onboarding or increasing ARPU through feature tiers.
A consumer subscription box charges $35/month with 45% gross margin (products and shipping are expensive). Monthly churn is 8% and CAC is $45 via social media ads.
Despite high churn and lower margins typical of consumer products, the low CAC creates healthy unit economics. The short payback period allows for aggressive growth.
A B2B consulting firm charges $5,000/month retainers with 70% gross margin (consultants are expensive). Monthly churn is 2% and CAC is $12,000 (enterprise sales cycle).
Exceptional unit economics typical of enterprise B2B. The high ratio (14.6x) suggests potential to scale acquisition aggressively while maintaining profitability.
While LTV is essential for business planning, understanding its limitations helps avoid common pitfalls in strategic decision-making.
LTV calculations assume future customers behave like past customers. Market changes, competitive pressure, or product evolution can significantly alter actual outcomes.
Customers from different channels, time periods, or segments often have vastly different LTVs. Using company-wide averages can mask important variations and lead to poor allocation.
Standard LTV ignores the value of customer referrals. A customer who brings in 3 additional customers has much higher true lifetime value than one who doesn't.
Simple LTV formulas don't discount future revenue. A dollar received in year 5 is worth less than a dollar today. Use NPV-adjusted LTV for capital allocation decisions.
Most LTV formulas assume churn remains constant over time. In reality, churn often decreases as customers become more embedded, meaning LTV may be underestimated for sticky products.
Pair this tool with the Churn Rate Calculator, CAC Calculator, and ARR Calculator to build a complete view of your unit economics. For more SaaS benchmarks, explore the SaaS tools hub.
The LTV:CAC ratio is the most important metric for subscription business health. Target 3:1 or higher for sustainable growth and profitability.
Reducing churn by just 1% can dramatically increase LTV due to the compounding effect on customer lifespan. Invest in retention before scaling acquisition.
CAC payback period should ideally be 12 months or less. Longer payback periods require more capital and increase risk exposure.
Always use gross margin adjusted LTV for business decisions. Revenue-based LTV overstates true customer value by ignoring cost of goods sold.
Segment LTV by acquisition channel, customer type, and cohort. Company-wide averages can hide crucial insights for optimization.
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