SaaS Lifetime Value Calculator
### SaaS Financial Modeling & Unit Economics **Customer Lifetime Value** is the cornerstone metric of subscription software businesses, representing the total gross profit an.
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📐 Formula
💡 Practical Example
A B2B SaaS startup charging $150/month with 3% monthly churn and 80% gross margins yields $4,000 in lifetime gross profit per account. Spending $1,200 on Google Search ads to acquire that customer delivers a 3.33x return with payback in 10 months.
📖 About SaaS Lifetime Value Calculator
SaaS Financial Modeling & Unit Economics
Customer Lifetime Value is the cornerstone metric of subscription software businesses, representing the total gross profit an organization expects to generate from a single customer throughout their subscription relationship.
Primary SaaS Mathematics Equations
- Average Customer Lifespan (T): T = (1) / (Monthly Churn Rate)
- Gross Revenue LTV: LTV_gross = ARPUChurn Rate
- Margin-Adjusted / Contribution LTV: LTV_adjusted = ARPU × Gross Margin (\%)Churn Rate
- LTV to CAC Ratio: Ratio = LTV_adjustedCAC
- CAC Payback Period (Months): Payback = CACARPU × Gross Margin (\%)
Industry Venture Capital Benchmarks for SaaS
- LTV : CAC 3.0x: The universal standard for healthy, scalable subscription businesses.
- LTV : CAC > 5.0x: Under-investing in marketing; the company could accelerate growth by scaling ad spend.
- CAC Payback < 12 Months: Capital efficient, allowing rapid recycling of cash flow into growth.
- Net Revenue Retention (NRR) > 110\%: Expansion revenue from existing accounts outpaces churn.
How to Use This Calculator
Enter your Average Revenue Per Account (Monthly ARPU - ) (e.g. 150 in /mo), Monthly Customer Churn Rate (%) (e.g. 3 in %), Gross Profit Margin (%) (e.g. 80 in %), and Customer Acquisition Cost (CAC - ) (e.g. 1200 in ). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
Lifespan in months = 1 / Churn Rate
Gross LTV = ARPU / Churn Rate
Margin-adjusted LTV = Gross LTV * Gross Margin %
CAC Payback = CAC / (ARPU * Gross Margin %)
Worked Example
A B2B SaaS startup charging 150/month with 3% monthly churn and 80% gross margins yields 4,000 in lifetime gross profit per account. Spending 1,200 on Google Search ads to acquire that customer delivers a 3.33x return with payback in 10 months.
Understanding Your Result
Evaluate your result in the context of your specific use case and relevant industry standards or reference values. A single calculated result is a starting point — test two to three scenarios to understand how sensitive the outcome is to your key input assumptions. For high-stakes decisions, verify your result against a secondary source or subject-matter expert before acting.
💡 Mathematical Rigor & Applied Context
- This calculator applies exact mathematical definitions following conventions established by NIST and international standards bodies.
- Rounding errors accumulate across multi-step calculations. For precision-critical work, maintain extra significant figures through all intermediate steps.
- Many mathematical concepts have multiple valid formulations — if a result seems unexpected, verify which convention or definition applies to your context.
- Dimensional analysis (unit tracking) is the fastest way to catch formula errors. Every term in an equation must have consistent, compatible units.
- Numerical methods used in digital calculators introduce floating-point precision limits (~15 significant digits for IEEE 754 double precision).
- For statistical and probabilistic calculations, always specify whether you are working with population parameters or sample statistics — formulas differ.
- Visualizing a problem geometrically or testing with known boundary values (zero, infinity, negative) reveals hidden errors faster than algebraic checking.
- When in doubt, validate your result against a simplified hand calculation or a published worked example from a textbook or standards document.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.