SaaS Metrics Calculator
Running a SaaS business? This calculator tracks MRR, ARR, churn, LTV, CAC, and payback period — the metrics that determine whether your SaaS is investable.
SaaS Unit Economics Calculator (CAC/LTV)
Measure the health of your customer acquisition and retention
CAC = Marketing Spend / New Customers. LTV = (Avg Revenue × Gross Margin) / Churn Rate. A healthy LTV:CAC ratio is 3:1 or higher. Payback under 12 months is ideal for SaaS businesses.
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Frequently Asked Questions
What is a good LTV:CAC ratio for SaaS?+
Aim for 3:1 or higher. If your LTV:CAC is below 1:1, you're losing money on every customer. 1:1-3:1 is unsustainable. 3:1+ means you have a healthy, scalable business. Below 3:1, either reduce CAC or increase LTV through retention and upsells.
How do I calculate churn rate?+
Monthly churn rate = (Customers lost in month ÷ Customers at start of month) × 100. A 5% monthly churn means you lose 5% of customers each month. For SaaS, aim for under 5% monthly (under 2% is excellent). High churn kills growth no matter how fast you acquire.
What is the SaaS payback period?+
Payback period = CAC ÷ Monthly revenue per customer. If it costs $500 to acquire a customer paying $50/month, your payback is 10 months. Under 12 months is good. Under 6 months is excellent. Long payback means you need more capital to grow.
What is a good LTV:CAC ratio for SaaS?
Aim for 3:1 or higher. If your LTV:CAC is below 1:1, you're losing money on every customer. 1:1-3:1 is unsustainable. 3:1+ means you have a healthy, scalable business. Below 3:1, either reduce CAC or increase LTV through retention and upsells.