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SaaS Unit Economics & CAC / LTV Calculator

Calculate Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), Payback Period, and Rule of 40 score for SaaS businesses.

📊 SaaS Unit Economics & CAC / LTV Analyzer

Calculate Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), Payback Period, and Rule of 40 for subscription software businesses.

Customer Lifetime Value (LTV)

$4,800

~40.0 mo lifespan

Customer Acquisition Cost (CAC)

$500

per customer acquired

LTV : CAC Ratio

9.60x

High ROI / Under-investing (>5x)

CAC Payback Period

4.2 mo

✓ Under 12 mo (Healthy)

1. Unit Economics & Churn

$150/mo
2.5%
80%

2. Sales & Acquisition Spend

$25,000/mo
50 customers
50% ✓ Passed

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How to use the SaaS Unit Economics & CAC / LTV Calculator

Input your monthly ARPU, monthly customer churn rate, gross margin, marketing budget, and new customer volume to evaluate growth sustainability and unit economics.

?Frequently Asked Questions

What is the SaaS Unit Economics & CAC / LTV Calculator?

The SaaS Unit Economics Calculator models vital subscription business metrics including Customer Lifetime Value (LTV), Customer Acquisition Cost (CAC), LTV:CAC efficiency ratio, CAC Payback Period (months), and Rule of 40 benchmark performance.

Who is the SaaS Unit Economics & CAC / LTV Calculator for?

Built for SaaS founders, startup CFOs, product managers, and venture capital analysts evaluating subscription business model health.

How to Use the SaaS Unit Economics & CAC / LTV Calculator

  1. Enter your Average Revenue Per User (monthly ARPU) and gross margin percentage.
  2. Input monthly customer churn rate and marketing acquisition spend.
  3. Review your LTV:CAC ratio and CAC Payback Period.
  4. Test growth and profit margins to check your Rule of 40 score.

Worked Calculation Example

A SaaS company with $150 ARPU, 2.5% monthly churn, and 80% gross margin achieves a $4,800 LTV. With $500 CAC, the LTV:CAC ratio is 9.6x with a 4.2 month payback period.

Frequently Asked Questions

What is CAC Payback Period?

CAC Payback Period measures the number of months required for a SaaS business to recover the sales and marketing dollars spent acquiring a single customer.

What is a good CAC Payback Period for SaaS?

For SMB SaaS, under 12 months is considered healthy. For Enterprise SaaS with annual upfront contracts, payback periods between 12 and 18 months are acceptable.

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