The Rule of 40 in SaaS: How to Balance Growth and Profitability

In the early stages of a SaaS company, the focus is usually clear. Win customers. Keep them. Grow fast.

That approach makes sense. Strong revenue growth can create momentum, attract investors, and build market presence quickly. However, growth alone does not guarantee long-term success. What truly matters is how efficiently that growth turns into profit.

As a cloud engineer who has worked closely with finance and product teams, I have seen this tension firsthand. The companies that thrive are not just growing. They are growing responsibly. This is where the Rule of 40 becomes essential.

What is the rule of 40?

The Rule of 40 states that a SaaS company’s revenue growth rate plus its profit margin should equal or exceed 40 percent.In simple terms:

Growth rate + Profit margin ≥ 40 percent

If a company is growing at 40 percent annually, it can afford to operate at break-even. If growth is 20 percent, the profit margin should also be around 20 percent. If growth slows to 10 percent, margins need to rise to about 30 percent.

The principle encourages balance. It does not demand both high growth and high profit at the same time. Instead, it ensures that together they signal sustainable performance.

A strong example is TechnologyOne, which reported a Rule of 40 score of 49 percent in the first half of 2025. That result reflects disciplined expansion combined with healthy margins.

A brief history of the rule

The Rule of 40 gained popularity in 2015 when venture capitalist Brad Feld wrote about it in his article “The Rule of 40% for Healthy SaaS Companies.”

He explained that late-stage investors were already using this benchmark to evaluate SaaS businesses with annual revenue above 50 million dollars. Feld later suggested that even companies with as little as 1 million dollars in revenue could benefit from applying it.

Over time, the rule became a widely accepted benchmark across the SaaS industry.

Why the rule of 40 matters

Revenue growth measures how quickly a company increases sales. Profit margin shows how much of that revenue becomes earnings after covering costs such as cloud infrastructure, salaries, and operations.

The Rule of 40 connects both metrics. It answers a critical question:

Is the company growing in a way that is financially sustainable?

In the SaaS world, where gross margins often range between 70 and 90 percent, this benchmark works particularly well. It helps compare companies with different strategies, pricing models, and operating structures.

As of Q1 2025, the median Rule of 40 score across tracked SaaS firms is 12 percent. Median growth is 10 percent, and median EBITDA margin is 6 percent. Only a few companies are above the 40 percent benchmark:

• Doximity at 55 percent
• Klaviyo at 25 percent
• MeridianLink at 36 percent

These figures highlight how challenging it is to achieve both strong growth and strong profitability in today’s market.

How to calculate the rule of 40

The calculation itself is straightforward. The complexity lies in choosing the right inputs.

Step 1: Calculate revenue growth rate

Revenue growth is typically measured using annual recurring revenue or monthly recurring revenue.

Monthly recurring revenue (MRR)MRR = Total active accounts × Average revenue per account

Annual recurring revenue (ARR): ARR = MRR × 12

Growth rate formula (Current year value − Prior year value) ÷ Prior year value

For example, if revenue increased from 10 million dollars to 12 million dollars year over year:

Growth rate = (12 − 10) ÷ 10 = 20 percent

Step 2: calculate profitability margin

Most SaaS companies use EBITDA margin.

EBITDA margin = EBITDA ÷ Revenue

If EBITDA is 3 million dollars on 10 million dollars of revenue:

Profit margin = 3 ÷ 10 = 30 percent

Final calculation

20 percent growth + 30 percent margin = 50 percent

This company exceeds the Rule of 40 benchmark.

It is also possible for either number to be negative. A company growing at 50 percent could operate at a 10 percent loss and still meet the rule. The idea is not perfect. It is balance.

When should startups use the rule?

Timing matters.

Early-stage companies should first focus on product-market fit and consistent revenue traction. Many follow a high-growth approach in their first few years before optimizing for margin.

Once ARR crosses 1 million dollars or there is at least 12 to 18 months of stable financial data, the Rule of 40 becomes meaningful.

At that stage, it can help:

• Signal financial discipline to investors
• Align engineering and finance teams
• Guide infrastructure and cost planning
• Model long-term margin impact of architectural decisions

From my experience, applying the rule too early can distract teams. Applying it at the right stage creates clarity.

What is a healthy SaaS growth rate?

Annual SaaS growth typically ranges between 15 and 45 percent, depending on company size and maturity.

Smaller firms under 2 million dollars in revenue often grow faster. Larger firms tend to grow more steadily but focus more on improving margins and efficiency.

Average contract value also shifts with scale. Companies with 10 to 20 million dollars in ARR now average nearly 55,000 dollars in ACV, while firms above 20 million dollars in ARR average around 40,000 dollars.

These shifts show that growth quality matters as much as growth speed.

Pros, pitfalls, and common mistakes

Pros

• Easy to understand and communicate
• Balances growth with profitability
• Useful for investors and operators
• Supports strategic planning

Pitfalls

• Not suitable as a one-size-fits-all metric
• Can hide operational inefficiencies
• Does not account for valuation
• Sensitive to short-term market volatility

Common mistakes

• Using it without analyzing CAC, churn, or cost of goods sold
• Treating it as a guarantee of business success
• Ignoring segment-level profitability

The Rule of 40 is a guide, not a verdict.

Managing cloud costs to support the rule

In SaaS, cloud infrastructure is a major component of the cost of goods sold. Poor visibility into cloud spend can quietly erode margins.

This is where Opslyft plays a critical role.

With Opslyft, companies can:

• Allocate 100 percent of cloud costs across products and customers
• Measure cost per customer and cost per feature
• Identify high-margin and low-margin segments
• Track cost changes in near real time
• Empower engineering teams to design cost-efficient architectures

Several customers have reduced cloud costs by over 22 percent. Others improved their cloud efficiency rate by 33 percent within the first year.

From a technical standpoint, I believe this is where financial strategy meets engineering discipline. When developers understand the cost impact of their architectural decisions, margin improvement becomes part of the development lifecycle. And yes, sometimes the cheapest line of code is the one you never deploy.

Balancing competing goals

Every SaaS company faces tradeoffs.

Investing in marketing, expanding product features, or entering new markets increases revenue potential. It also raises costs.

Cutting expenses improves margins but may slow growth.

The leadership team’s responsibility is to balance these forces. The Rule of 40 helps visualize that balance in one clear metric.

The goal is not to maximize both numbers simultaneously. The goal is to ensure the company is progressing in at least one meaningful direction without damaging long-term stability.

Conclusion

The Rule of 40 remains one of the most trusted benchmarks in SaaS. It brings together growth and profitability into a single, practical measure of financial health.

While many companies struggle to reach the 40 percent threshold, the principle itself is still highly relevant in 2025. When used alongside metrics such as customer acquisition cost, churn, and cloud unit economics, it provides a strong foundation for strategic decision-making.

In my view, sustainable SaaS success depends on disciplined growth, controlled infrastructure costs, and clear financial visibility. Tools like Opslyft support that visibility, enabling engineering and finance teams to work toward the same objective.

Growth is exciting. Profit is reassuring. The Rule of 40 ensures you never chase one at the expense of the other.

And in SaaS, balance is not just good practice. It is survival.