SaaS Customer LTV & CAC Calculator (Unit Economics & Cohort Decay)
Institutional SaaS unit economics engine for founders, venture analysts, and product managers to model margin-adjusted lifetime value and acquisition payback.
Direct Answer & Pipeline Overview
SaaS Customer LTV & CAC Calculator is a specialized, 100% client-side engineering utility developed by Atlyxen Studios. It processes calculations and conversions directly inside your browser memory using hardware-accelerated WebAssembly and WebGL, guaranteeing instant results with zero server file transfers and zero data retention.
How to Use the SaaS Customer LTV & CAC Calculator
Input ARPU & Billing Cycle
Provide your Average Revenue Per Account or User on a monthly or annualized contract basis.
Specify Churn Rate & Gross Margin
Input your monthly cancellation rate and gross software margin percentage (typically 75% to 85% for SaaS).
Input Customer Acquisition Cost (CAC)
Enter your fully loaded sales, marketing, and advertising expense per acquired paying customer.
Evaluate Venture Health & Export
Review the LTV:CAC ratio and CAC payback period, copy the executive memo, or download the CSV cohort model.
Key Technical Capabilities
True margin-adjusted LTV calculation factoring in cloud hosting, infrastructure, and support COGS
LTV:CAC venture evaluation against the 3.0x industry benchmark
Exact CAC payback month computation indicating cash flow breakeven duration
36-month customer cohort retention decay and cumulative profit SVG curves
Industry archetype presets for Enterprise B2B, Mid-Market, Product-Led Growth (PLG), and Micro-SaaS
One-click executive memo generation and CSV financial model export
100% private in-browser computation with zero cloud telemetry or financial data storage
Frequently Asked Questions
Why must Gross Margin be included in the SaaS LTV formula?
Many simplified calculators define LTV as simply ARPU divided by Churn Rate. This is a dangerous mistake because it measures gross revenue rather than gross profit. Every SaaS business incurs recurring costs of goods sold (COGS) such as AWS/GCP hosting, database licensing, customer support, and payment fees. Multiplying by Gross Margin provides the true gross profit contribution generated by each customer.
What is considered a healthy LTV:CAC ratio for venture funding?
An LTV:CAC ratio of 3.0x or higher is the industry standard for a healthy, venture-backable SaaS company. A ratio of 5.0x or higher indicates exceptionally high acquisition efficiency or an opportunity to invest more aggressively in growth. Ratios under 2.0x indicate that customer acquisition costs are too high relative to customer retention, threatening insolvency.
What is a good CAC payback period?
For self-serve and product-led growth (PLG) SaaS products, top quartile startups achieve a CAC payback period under 12 months. For mid-market and enterprise B2B sales cycles with annual contracts, a payback period of 12 to 18 months is considered healthy and acceptable.
How do annual contracts affect churn and LTV calculations?
Annual contracts secure 12 months of guaranteed revenue upfront and generally exhibit significantly lower annual churn (often under 10% to 15% annually). When modeling annual contracts, our tool normalizes the contract value into monthly ARPU to ensure accurate payback and retention curve projections.
Is any of our proprietary startup financial data sent to your servers?
No. All unit economics equations, cohort simulations, and financial summaries execute strictly inside your local browser memory. Zero financial inputs or metrics are ever transmitted across the internet.