Rule of 40

The Rule of 40 provides a simple framework for evaluating the health of a SaaS business. A company growing at 60% annually with -20% profit margins scores 40 and passes. A company growing at 20% with 25% margins scores 45 and passes. A company growing at 15% with 10% margins scores 25 and fails. The rule acknowledges that both growth and profitability matter, and exceptional performance in one can compensate for weakness in the other.

The rule is primarily used by investors and board members to assess company performance and compare across the SaaS universe. Companies above 40 are considered well-managed; above 60 is exceptional. The median public SaaS company hovers around 30-35, and the top quartile exceeds 50.

For growth teams, the Rule of 40 creates a useful constraint. It is not enough to grow fast; growth must be efficient enough that the company can eventually become profitable. Alternatively, it is not enough to be profitable; the company must grow fast enough to justify its valuation and market position. This tension forces growth teams to think holistically about both revenue growth rate and the cost efficiency of that growth, rather than optimizing for either metric in isolation.