SaaS Unit Economics Calculator
Calculate LTV, CAC, and payback period. Model churn impact on lifetime value and simulate growth scenarios in real time.
Quick Formulas: LTV = (ARPU × Gross Margin) ÷ Churn Rate. CAC = Sales & Marketing Spend ÷ New Customers. Payback = CAC ÷ (ARPU × Gross Margin). Target LTV:CAC ≥ 3x and payback ≤ 18 months.
Customer Acquisition Cost (CAC)
$200.00
Lifetime Value (LTV)
$1,333
LTV : CAC Ratio
6.67x
CAC Payback Period
5.0 Months
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LTV Projection by Churn Rate
Est. Valuation (2026 Benchmarks)
Based on 10x Revenue Multiple
Monthly Profit (Gross)
Before OpEx & S&M
Why the LTV:CAC Ratio is Your Most Important Metric
In 2026, venture capitalists have stopped chasing "Top Line Revenue." They are chasing efficiency. The LTV CAC ratio is the ultimate truth-teller for your business. It tells you exactly how many dollars of value you get back for every $1 you spend on marketing.
The 3:1 Rule in 2026
The industry benchmark for a healthy SaaS is an LTV:CAC ratio of 3:1. If you are at 1:1, you are essentially trading dollars and will eventually run out of cash. If you are at 5:1, you are actually under-spending—you should be more aggressive with your marketing to capture more of the market.
How to Improve Your Ratio
- Reduce CAC: Automate your lead generation to lower human labor costs. Our AI tools can help streamline your funnel.
- Increase LTV: Focus on "Net Revenue Retention" by upselling existing customers.
- Control Churn: Even a 1% reduction in churn can double your LTV over 24 months. Our SaaS unit economics calculator helps you model these scenarios.
Key SaaS Metrics
| Metric | Formula | Healthy Benchmark |
|---|---|---|
| LTV | (ARPU × Gross Margin) ÷ Churn | ≥ 3× CAC |
| CAC | S&M Spend ÷ New Customers | < LTV ÷ 3 |
| LTV:CAC Ratio | LTV ÷ CAC | 3:1 to 5:1 |
| CAC Payback | CAC ÷ (ARPU × GM%) | < 12–18 months |
| ARPU | MRR ÷ Total Customers | Depends on segment |
Frequently Asked Questions
What is a healthy LTV:CAC ratio?
The benchmark is 3:1 — you should generate $3 of lifetime customer value for every $1 spent acquiring them. A ratio below 3:1 signals unsustainable acquisition spend. Above 5:1 often means you are under-spending on growth and leaving market share for competitors.
How is LTV calculated for SaaS?
SaaS LTV = (ARPU × Gross Margin %) ÷ Monthly Churn Rate. For example: ARPU of $100, 80% gross margin, 2% monthly churn → LTV = ($100 × 0.80) ÷ 0.02 = $4,000.
What is CAC payback period?
CAC payback period is how many months it takes to recover the cost of acquiring a customer. Formula: CAC ÷ (ARPU × Gross Margin). A payback period under 12 months is considered excellent for SaaS; over 24 months is a red flag for capital efficiency.
Why does a 1% churn reduction have such a large LTV impact?
LTV is inversely proportional to churn rate — small churn reductions produce outsized LTV gains because the formula divides by churn. At 3% monthly churn, LTV = ARPU × margin ÷ 0.03. At 2% churn, LTV = ARPU × margin ÷ 0.02 — a 50% increase in LTV from a 1 percentage point reduction.