What is the rule of 40?

The rule of 40 is a pass/fail test for SaaS financial health. Add your revenue growth rate to your EBITDA margin. If the sum hits 40% or above, the company is balancing growth and profitability at a sustainable level. Below 40% means one side of the equation needs attention.

How do you calculate the rule of 40?

Add your revenue growth rate (ARR growth year over year) to your EBITDA margin (EBITDA divided by revenue). If the sum is 40% or above, the company passes. For example: 25% growth + 18% margin = 43%. Passes.

What is a good rule of 40 score?

Above 40% is the baseline for "healthy." The top quartile of public SaaS companies scores above 50%. Companies consistently above 40% for three or more years trade at 2-3x higher revenue multiples, according to BCG and Bain research.

Does the rule of 40 apply to startups?

Brad Feld, who popularized the rule of 40, argues it applies to companies of any size, including those with $1M in ARR. In practice, early-stage companies often score below 40% because they are investing heavily in growth. The rule of 40 becomes more relevant as companies approach $10M-$50M ARR and investors start asking about path to profitability.

Why is the rule of 40 important for investors?

The rule of 40 is one of the fastest ways to screen SaaS companies for investment quality. Rule of 40 stocks that consistently exceed the threshold tend to command higher valuation multiples because they demonstrate that growth is not coming at the expense of business sustainability.

How is AI changing the rule of 40?

AI infrastructure spend (GPU compute, model training, inference hosting) compresses EBITDA margins without immediately producing proportional revenue growth. This means companies investing in AI capabilities may see their rule of 40 scores drop even as they build the revenue engine for the next growth phase. Finance leaders need AI ROI data alongside the rule of 40 to evaluate these investments.

What is the difference between rule of 40 using EBITDA vs. FCF?

EBITDA-based calculations exclude capital expenditure. FCF-based calculations include it. For AI-heavy companies, FCF margin is typically lower because GPU infrastructure carries heavy capex. Using FCF gives a more conservative (and often more accurate) picture of cash generation.

What should finance leaders track beyond the rule of 40?

AI spend as a percentage of revenue, cost per customer including AI inference costs, margin per product line with full cloud allocation, and rule of 40 by customer cohort. The score is the output. These metrics are the inputs you can actually influence.

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