Micro-SaaS Founder LTV & Profitability Calculator
Simulate bootstrapped software unit economics with low overhead, high 90% gross margins, and organic acquisition.
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) | $39.00 | Per user/month |
| Monthly Churn Rate | 3% | Customer attrition |
| Gross Margin Percentage | 90% | Cost of service deducted |
| Customer Lifespan | 33.3 months | 1 / Churn rate |
| Customer Acquisition Cost (CAC) | $75.00 | Blended marketing + sales |
| Customer Lifetime Value (LTV) | $1170.00 | Total gross profit per customer |
| LTV to CAC Health Ratio | 15.6x | Benchmark: >3.0x |
| CAC Payback Period | 2.1 months | Benchmark: <12 months |
| Net LTV Profit Contribution | $1095.00 | LTV minus CAC |
Overview & Methodology
Bootstrapped micro-SaaS tools built by solo founders often enjoy 85% to 92% gross margins due to lean cloud architecture and zero sales headcount, enabling highly profitable unit economics even at modest ARPU.
Mathematical Formulation
Micro-SaaS LTV = (Monthly Price × 0.90 Margin) / Monthly Churn. Net Profit per User = LTV - Acquisition Cost.Optimization Best Practices
Because you lack a dedicated sales team, focus on programmatic SEO and word-of-mouth distribution to keep CAC under $50.
Price slightly higher: moving from $19/mo to $39/mo often attracts more professional customers with lower churn rates.
Reach $10k MRR with just 256 customers at $39/month.
Frequently Asked Questions
Q.What is the LTV of a $39/mo Micro-SaaS with 3% monthly churn?
With a 90% gross margin ($35.10 monthly profit), LTV is $1,170.00 per customer over an average 33.3 month lifespan.
Q.How much can a solo founder spend on ads if LTV is $1,170?
At a conservative 4.0x LTV:CAC target, you can afford up to $292.50 to acquire a paying customer and still maintain high profitability.
Q.Why do solo founders have higher gross margins than venture-backed SaaS?
Solo founders use efficient serverless architecture, have zero office overhead, and handle customer support directly.