Calculate Customer Lifetime Value to Optimize Acquisition and Retention
Customer Lifetime Value (LTV) calculator helps founders and growth teams understand the total revenue value of a customer relationship. This calculator uses ARPU, retention rate, and gross margin to determine LTV, LTV:CAC ratio, and payback period. Understanding these metrics enables data-driven decisions about acquisition spending and retention investments.
Customer LTV
$1.00K
LTV:CAC Ratio
5.0:1
Avg Customer Lifespan
20.0 mo
Payback Period
5.7 mo
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LTV = (ARPU × Gross Margin) ÷ Monthly Churn Rate, Customer Lifespan = 1 ÷ Churn Rate, LTV:CAC Ratio = LTV ÷ CAC
This calculator determines customer lifetime value by multiplying the monthly gross profit contribution (ARPU times margin) by the expected customer lifespan (inverse of churn rate). The LTV:CAC ratio shows acquisition efficiency by comparing lifetime value to acquisition cost.
LTV is the foundation of sustainable growth economics. Understanding the total value a customer generates over their relationship allows you to make informed decisions about how much to invest in acquisition. Companies that overspend on CAC relative to LTV burn cash unsustainably, while those that underspend leave growth on the table.
The LTV:CAC ratio is the key health metric for subscription businesses. A ratio below 1:1 means you lose money on every customer acquired. Between 1:1 and 3:1 suggests profitability but limited reinvestment capacity. Above 3:1 indicates healthy unit economics that support aggressive growth.
Payback period matters for cash flow planning. Even with strong LTV:CAC ratios, long payback periods strain working capital. Understanding when customers become profitable helps plan fundraising timing and growth rate decisions.
Subscription software company with low churn and high margins.
LTV of $1,333 with LTV:CAC ratio of 8.9:1 and 4-month payback period.
B2C subscription with moderate churn and lower margins.
LTV of $113 with LTV:CAC ratio of 2.3:1 and 5.5-month payback period.
High-value enterprise contracts with excellent retention.
LTV of $425,000 with LTV:CAC ratio of 17:1 and 6-month payback period.
The standard LTV formula is: LTV = (ARPU × Gross Margin) / Monthly Churn Rate. This calculates the total profit expected from a customer over their relationship. For example, $50 ARPU × 80% margin ÷ 3% monthly churn = $1,333 LTV.
Industry standard is 3:1 or higher for a healthy business. Below 1:1 means losing money on acquisition. Between 1:1 and 3:1 is marginal. Above 3:1 is healthy, and above 5:1 suggests you may be underinvesting in growth.
Retention has an exponential impact on LTV. Customer lifespan equals 1/churn rate. Improving retention from 95% to 97% (reducing churn from 5% to 3%) increases average lifespan from 20 to 33 months - a 65% increase in LTV from just 2 percentage points of retention improvement.
Yes. Gross margin LTV represents actual profit contribution toward recovering CAC and generating profit. A $100 ARPU with 60% margin contributes $60 monthly, while $100 ARPU with 90% margin contributes $90. Ignoring margin overstates true customer value.
Payback Period = CAC / (ARPU × Gross Margin). This shows how many months until a customer becomes profitable. A $200 CAC with $50 ARPU and 80% margin means $40 monthly contribution, so payback is 5 months.
Three levers improve LTV: increase ARPU through upsells and price optimization, improve gross margin through operational efficiency, and reduce churn through better product and customer success. Retention improvements often have the highest impact because they compound over the entire customer lifespan.
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