Rule of 40

The Rule of 40 is a principle used primarily in the SaaS industry to measure a company's performance by balancing revenue growth with profitability. It states that a company's revenue growth rate plus its profit margin should be equal to or greater than 40%. The revenue growth component is typically calculated using Annual Recurring Revenue (ARR) on a year-over-year basis.

This metric provides a high-level view of a company's health, acknowledging the trade-off between investing in rapid growth and achieving immediate profitability. The "profit margin" component is not strictly defined and can vary; companies often use either EBITDA margin or Free Cash Flow (FCF) margin. This flexibility allows the rule to be applied to businesses at different stages of maturity.

Investors and finance leaders use the Rule of 40 as a quick benchmark to assess scalability and financial discipline. A company can be considered healthy if it meets the 40% threshold through various combinations, such as high growth and low profitability, or moderate growth and high profitability, making it a valuable tool in strategic and financial planning.