Rule of 40

The Calculation

Rule of 40 = YoY Revenue Growth Rate (%) + Profit Margin (%)

A company growing at 30% with 15% margins scores 45 and passes. A company growing at 60% but burning at negative 30% scores 30 and fails. Use EBITDA margin or free cash flow margin — pick one and be consistent. The growth rate should be year-over-year ARR growth, not quarter-over-quarter annualized, which inflates the number.

Why Investors Use It as a Screen

Public SaaS cohorts scoring above 40% on a weighted basis trade at 12-15x EV/Revenue versus roughly 6x for the broad median (Meritech Capital, 2025). The Rule of 40 became the standard efficiency screen because it acknowledges the fundamental tradeoff in SaaS: you can grow fast with thin margins or grow slowly with fat margins, and both paths can be healthy. The number just has to add up. It forces the conversation between growth and profitability that every CFO needs to have — and every board wants to see.

Where the Rule of 40 Breaks Down

The Rule of 40 treats a 5% growth / 35% margin company the same as a 35% growth / 5% margin company. Both score 40. But they are fundamentally different businesses with fundamentally different futures. High-growth companies can optimize margins later. Low-growth companies with high margins are often ex-growth stories running out of market. Context always matters more than the formula. A company barely passing at 41 with declining growth is in worse shape than a company at 38 with accelerating growth and expanding margins.

When to Start Caring About Rule of 40

If you are pre-Series B, do not optimize for Rule of 40. Focus on product-market fit, pipeline velocity, and CAC payback. Once you are past $10M ARR and efficiency becomes a board-level topic, Rule of 40 enters the conversation. By the time you are north of $50M ARR, it is one of the primary metrics your investors track. For companies in the $10-50M range, use it as a diagnostic — are you balancing growth and efficiency, or sacrificing one completely for the other?

Rule of 40 and Revenue Operations

RevOps teams influence Rule of 40 more than most people realize. Improving win rates, shortening sales cycles, and reducing revenue leak all improve either the growth or the margin side of the equation. A 5-point improvement in sales efficiency that drops to the bottom line can move the Rule of 40 score meaningfully — often more efficiently than pouring money into top-of-funnel acquisition. Track how operational improvements flow through to the Rule of 40 score to demonstrate RevOps impact in terms the board understands.