Rule of 40

A SaaS benchmark stating that growth rate plus profit margin should equal or exceed 40%.

Definition

The Rule of 40 states that a healthy SaaS company's revenue growth rate plus profit margin (usually EBITDA margin) should be at least 40%. A company growing 60% with -20% margins passes (60 + -20 = 40). A company growing 20% with 25% margins passes (45). The rule provides a balanced view of growth vs. profitability.

The Rule of 40 is most relevant for companies with $10M+ ARR. Early-stage startups should prioritize growth rate alone. As companies mature, the balance shifts toward profitability.

Why it matters for founders

The Rule of 40 helps investors and founders evaluate the tradeoff between growth and profitability. Growing fast while burning cash can be fine if the combined score stays above 40. It's a quick health check used in SaaS valuations.

Example

Datadog achieved a Rule of 40 score of ~75 (50% revenue growth + 25% operating margin), earning a premium valuation. Meanwhile, a SaaS company growing at 15% with 10% margins scores only 25, signaling it's neither growing fast enough nor profitable enough.

How Foundra helps

Foundra's financial modeling helps early-stage founders understand the growth-profitability tradeoff so they can build toward Rule of 40 compliance as they scale.

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