The rule of 40 combines a SaaS company’s revenue growth rate and profit margin to offer a quick view of growth and efficiency. A score of 40 percent or higher is commonly considered a healthy benchmark, but it is not a universal fundraising requirement or a complete measure of company performance.
How do you calculate the rule of 40?
Add the company’s revenue growth rate to its profit margin. Express both figures as percentages, and treat a loss as a negative margin.
Revenue growth rate + profit margin = rule of 40 score
For example, a company with 60 percent annual revenue growth and a margin of negative 30 percent has a score of 30. The calculation is 60 plus negative 30. A business growing revenue by 50 percent with a negative 10 percent margin scores 40.
These examples explain the arithmetic, not the quality of either business. A combined score does not show what is generating growth, whether it can last, or how spending contributes to results. Two companies can reach the same score through very different mixes of growth and profitability.
When presenting your figure, show both inputs as well as the total. That makes the trade-off visible and gives investors a clearer basis for asking about the company’s operating choices.
Which profit margin should you use?
The calculation most often uses EBITDA margin or free cash flow margin. Some investors use operating margin instead, depending on the information available. These definitions are not interchangeable, so identify the one behind your score.
Consistency matters when you compare your performance across periods or against peers. If you switch from one margin definition to another, the resulting score may not be directly comparable. State the measure clearly, and follow an investor’s requested definition when one is specified.
A useful presentation includes the growth rate, the margin measure, and the calculation. This avoids leaving readers to guess how you arrived at the total. It also helps keep a conversation focused on the business rather than on an unclear metric.
When does the rule of 40 matter for startups?
The benchmark is generally more relevant once a company has meaningful recurring revenue and investors are comparing its growth and efficiency with peers. That context is more typical from Series B onward, though the benchmark is a guide rather than a requirement that all companies or investors apply in the same way.
At pre-seed and seed, a startup may not yet have enough recurring revenue for comparisons with growth-stage companies to be useful. In those stages, treating the number as a mandatory target can distract from the questions that matter for the company’s current situation.
Consider whether your business is at a stage where the comparison makes sense before emphasizing the score. If it does, be prepared to explain why the peers are relevant and what the calculation reveals about your company’s approach to growth and efficiency.
What should founders explain beyond the score?
Investors need context to understand what a combined percentage does and does not capture. Be ready to discuss:
- The revenue growth rate included in the calculation.
- Whether the margin is EBITDA, free cash flow, or operating margin.
- The factors behind the company’s growth and profitability.
- Why comparison with growth-stage peers is appropriate.
- What operating details are not reflected in the score.
A score is a starting point for a discussion, not a substitute for one. Explaining the underlying inputs helps investors evaluate how the company is growing and what it is spending to support that growth.
It is also useful to distinguish a metric from the broader assessment of a business. The rule of 40 does not explain the causes of growth, how durable it may be, or whether current spending is producing results. Those questions require more information than the combined figure can provide.
How can you present the benchmark during fundraising?
Treat the calculation as one part of your financial explanation. Name the margin definition, show the math, and make clear why the benchmark is relevant to your company’s stage. Then connect the figures to the business choices behind them.
Avoid framing 40 as a target every startup must reach. The benchmark is commonly used as a quick screen by some growth-stage investors, but it is not a verdict on the company. A result below 40 does not by itself explain whether a business is performing well, just as a result above 40 does not tell the full story.
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Frequently Asked Questions
Is the rule of 40 only for SaaS companies?
It is commonly described as a SaaS benchmark. It combines revenue growth and profit margin to provide a compact way to consider growth alongside efficiency.
What score is considered healthy?
A score of 40 percent or higher is commonly treated as healthy. It is a benchmark rather than a universal target, and its usefulness depends on the company and its context.
Can a company use operating margin?
Yes. EBITDA margin and free cash flow margin are the most common measures, while some investors use operating margin. State which definition you use and apply it consistently.
Should a seed-stage startup target a score of 40?
Usually, this is not a necessary target at pre-seed or seed. The measure tends to be more relevant when a company has meaningful recurring revenue and is compared with growth-stage peers.
Does a score above 40 prove a company is healthy?
No. The score is a quick screen, not a complete assessment. It does not show what drives growth, whether that growth is durable, or how spending affects results.