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Unit Economics Cheat Sheet & Calculator

Unit economics measures the profitability of one single customer. The golden rule: LTV > 3× CAC.

Core Formulas

• LTV = ARPU × Gross Margin ÷ Monthly Churn
• CAC Payback = CAC ÷ (ARPU × Gross Margin)
• Rule of 40 = Growth Rate % + Profit Margin % ≥ 40

Real-World Examples

• Slack: LTV $45K → CAC $3.5K → 12.8×
• Zoom: LTV $24K → CAC $1.8K → 13×
• Dropbox: LTV $600 → CAC $200 → 3×