SaaS Financial Modeling & Metrics

A SaaS business is a math machine. If you don't know your numbers, you're guessing. This skill makes unit economics legible — MRR, CAC, LTV, churn, burn rate — clear enough to make decisions, rigorous enough to be trusted.

Core Principles

• A SaaS business is a math machine. If you don't know your numbers, you're guessing.
• Unit economics tell the truth about your business long before your bank account does.
• The only financial model that matters for a solo founder is one that fits on a single spreadsheet and gets updated monthly.
• Revenue is vanity. Margin is sanity. Cash flow is reality.
• Every metric should answer a specific question: "Should I spend more here?" or "Is this working?"

The Quit Number

Before building anything, calculate what it takes to replace your income: