Why adjust LTV for gross margin?

Revenue-only LTV ignores the cost of hosting, customer support, and third-party APIs. Multiplying ARPU by gross margin reflects actual cash available to recover customer acquisition costs.

Updated: August 2026 • Verified v1.2

SaaS LTV:CAC Ratio & Payback Sensitivity Matrix Calculator

Finance & MathNew

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LTV = (ARPU * Gross_Margin_Pct) / Churn_Pct; CAC_Payback = CAC / (ARPU * Gross_Margin_Pct)

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Understanding Your Results

Calculates gross-profit-adjusted LTV, customer lifetime in months, CAC payback duration, and generates a color-coded sensitivity table displaying payback resilience across 25 combinations of CAC and churn.

Practical Guidance & Next Steps

Top-quartile SaaS companies achieve CAC payback in under 12 months with an LTV:CAC ratio exceeding 3.0x. Payback periods over 18 months signal high capital intensity.

What is this?

A financial modeling utility for SaaS founders to calculate unit economics and stress-test CAC payback durations under varying churn rates and marketing spend.

How does it work?

1. Enter monthly ARPU, gross margin percentage, monthly churn rate, and CAC. 2. View calculated LTV, LTV:CAC ratio, customer lifetime, and months to payback. 3. Analyze the interactive sensitivity heatmap across 25 churn and acquisition cost scenarios.

Why use it?

Helps startup leadership optimize sales and marketing efficiency and prepare financial due diligence models for venture capital rounds.

Technical Scope & Calculation Limitations

Standard SaaS unit economics formulas.

Frequently Asked Questions

Under 12 months is considered excellent, 12-18 months is typical for mid-market SaaS, and over 18 months requires substantial working capital to fund growth.

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