B2C SaaS Churn Rate & Customer Lifetime Calculator
Simulate consumer subscription attrition and see how small churn reductions drastically increase customer lifetime value.
Parameters & Config
Average monthly subscription fee billed per active customer
Percentage of customers cancelling their subscription each month
Total sales and marketing expenditure required to acquire one customer
Percentage of subscription revenue retained after hosting and direct support costs
Total gross profit generated per customer over their active lifecycle
Benchmark metric for SaaS efficiency (Ideal: 3.0x to 5.0x)
Key Metrics & Sub-Totals
3 itemsCalculation Summary & Unit Breakdown
| Metric | Calculated Value | Notes / Logic |
|---|---|---|
| Monthly ARPU (Revenue/User) | $19.00 | Per user/month |
| Monthly Churn Rate | 6% | Customer attrition |
| Gross Margin Percentage | 75% | Cost of service deducted |
| Customer Lifespan | 16.7 months | 1 / Churn rate |
| Customer Acquisition Cost (CAC) | $45.00 | Blended marketing + sales |
| Customer Lifetime Value (LTV) | $237.50 | Total gross profit per customer |
| LTV to CAC Health Ratio | 5.28x | Benchmark: >3.0x |
| CAC Payback Period | 3.2 months | Benchmark: <12 months |
| Net LTV Profit Contribution | $192.50 | LTV minus CAC |
Overview & Methodology
B2C subscription products face higher voluntary and involuntary churn (typically 5% to 8% per month). Because ARPU is modest ($10–$30/mo), mastering unit economics and churn control is critical for maintaining profitable paid acquisition.
Mathematical Formulation
Customer Lifespan (Months) = 1 / (Monthly Churn Rate / 100). LTV = (ARPU × Gross Margin) × Lifespan.Optimization Best Practices
Implement automated card updater tools (Stripe Account Updater) to recover up to 30% of involuntary churn from expired debit cards.
Offer discounted annual subscriptions ($99/year instead of $12/month) to lock in customer lifetime upfront.
Provide pause subscription options at cancellation exit surveys to retain up to 15% of at-risk users.
Frequently Asked Questions
Q.What is an average monthly churn rate for consumer B2C SaaS?
B2C apps typically experience 5% to 8% monthly churn, compared to B2B SaaS which typically targets 1% to 2%.
Q.How long does a customer stay on average with 6% monthly churn?
At 6% monthly churn, average customer lifespan is 16.7 months (1 / 0.06).
Q.How much does LTV increase if churn drops from 6% to 4%?
A drop from 6% to 4% churn increases customer lifespan from 16.7 to 25.0 months, boosting LTV by a massive 50%.