Rule of 40

The Rule of 40 is a high-level performance benchmark for SaaS companies that balances growth and profitability. The formula is simple: Revenue Growth Rate (%) + Profit Margin (%) ≥ 40%. A company growing at 50% year-over-year with a -10% profit margin scores 40 (50 + -10). A company growing at 20% with 20% profit margin also scores 40 (20 + 20). Both are considered healthy — they're just at different points on the growth-profitability spectrum.

The Rule of 40 acknowledges a fundamental tension in SaaS: you can grow fast by spending heavily (negative margins) or be profitable by growing slowly (lower growth rate). Neither extreme is ideal. A company growing 100% but burning cash unsustainably will eventually need to moderate. A company with great margins but 5% growth isn't building enterprise value. The Rule of 40 says that the combination of the two should exceed a certain threshold.

The profit margin used varies by context — some use EBITDA margin, others use free cash flow margin, and early-stage companies sometimes use operating margin. The growth rate is typically year-over-year revenue growth. For public SaaS companies, the Rule of 40 is a widely followed benchmark, and companies consistently above it tend to command premium valuations. For early-stage startups, it's more of a directional guide — high growth with controlled burn is the ideal.

The Rule of 40 gives you a single number to evaluate the health of your business as it matures. Early-stage startups should be heavily tilted toward growth (80% growth + -40% margin = 40). As the company scales, the mix shifts toward profitability (25% growth + 20% margin = 45). Understanding this framework helps you make strategic decisions about when to invest in growth versus when to focus on efficiency. It's also a metric that investors, board members, and potential acquirers will reference when evaluating your company.