Rule of 40 for SaaS: Formula, Benchmarks, and Examples

Q: What is the rule of 40 in simple terms?

The rule of 40 says your growth rate plus your profit margin should be at least 40%. If you're growing at 30% per year and running at 15% profit margin, your score is 45, you pass. It's a quick health check on whether you're balancing growth and profitability appropriately.

Q: Which profit metric should I use for the rule of 40?

The most common choice is EBITDA margin. Free cash flow margin is increasingly preferred by investors, especially for public companies. Operating income margin is another option. Pick one, use it consistently, and be explicit about which metric you're using when sharing your score.

Q: Is the rule of 40 relevant for bootstrapped SaaS?

Yes, but with important context. Bootstrapped founders typically can't sustain negative margins, so their scores lean toward the profitability side rather than the growth side. A score above 40 is achievable without hypergrowth if margins are strong. The rule helps bootstrapped founders understand whether their growth rate justifies their spending level.

Q: What's a good rule of 40 score?

40 is the threshold. 50+ is strong. 60+ is exceptional. Below 20 is concerning. Median public SaaS companies score around 40–50. Early-stage companies often score lower as they invest in growth; mature profitable companies can score very high.

Q: How often should I calculate my rule of 40 score?

Annually, using full-year revenue figures. Monthly or quarterly calculations introduce seasonality noise that can mislead. Track it annually and look for trends year-over-year. If your score drops significantly year-on-year without a deliberate explanation, investigate both your growth rate and your margin.

Q: Can a company pass the rule of 40 while losing money?

Yes. If you're growing at 60% annually and losing 15%, your rule of 40 score is 45, passing. This is the classic VC-backed growth company profile. The rule explicitly allows losses when offset by high growth. The question it asks is whether the growth justifies the losses, not whether you're profitable.

Q: How is the rule of 40 different from gross margin?

Gross margin measures the profitability of your core product (revenue minus COGS). The rule of 40 uses EBITDA or operating margin, which deducts all operating expenses including S&M and G&A. A SaaS company can have 80% gross margin but -20% EBITDA margin if it's spending heavily on sales. Both matter. SaaS gross margin explains how gross margin relates to overall efficiency.

Q: Does the rule of 40 apply to companies under €1M ARR?

It's less reliable at very small scale due to revenue volatility. A €200K ARR business that closes a single €30K annual deal can see its growth rate swing dramatically. Apply the rule of 40 as a directional indicator at small scale, not a precise benchmark. Once you're past €500K ARR, it becomes more meaningful.

Q: What's the connection between rule of 40 and SaaS valuation?

Revenue multiples in SaaS tend to correlate with rule of 40 scores. Companies above 60 typically command the highest multiples; those below 20 see significant discounts. The relationship isn't linear or guaranteed, but rule of 40 score is one of the first numbers acquirers and investors look at when sizing up a SaaS business. --- > Know your growth rate and margins in real time. Connect Stripe to NoNoiseMetrics and track MRR growth, expansion, and all the inputs you need to calculate your rule of 40 score accurately. > > Connect Stripe and track your metrics → ---

Q: MRR Dashboard Template

Want to track the growth inputs for your rule of 40 score automatically? The MRR Dashboard Template gives you a ready-made structure for MRR, growth rate, and revenue movement, all the building blocks for the rule of 40 calculation.

The rule of 40 says that a healthy SaaS business should have growth rate plus profit margin equal to or greater than 40. If you’re growing at 50% annually, you can afford to lose money (down to -10% margin). If you’re growing at 10%, you need to be 30% profitable. The rule of 40 combines two metrics that are often optimised in isolation, growth rate and profitability, into a single number that shows whether you’re building a sustainable business or just burning cash to grow.

The rule of 40 states that a SaaS company’s revenue growth rate plus its profit margin (EBITDA or free cash flow margin) should equal at least 40%. Scores above 40 indicate a healthy balance of growth and efficiency.

Rule of 40 for SaaS: Formula, Benchmarks, and Worked Examples

The Rule of 40 Formula

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

Where:

Revenue Growth Rate, year-over-year revenue growth, expressed as a percentage
Profit Margin, typically EBITDA margin or free cash flow margin, expressed as a percentage (can be negative)

If the score is ≥ 40, you pass. Below 40, there’s an efficiency problem somewhere, either growth is too slow for your level of losses, or you’re too unprofitable for your growth rate.

Which profit metric to use? There’s no single standard:

EBITDA margin: most commonly used for private SaaS
Free cash flow margin: preferred by growth-stage investors and public markets (Bessemer Venture Partners uses FCF)
Operating income margin: used by some benchmarking firms

Pick one and use it consistently. Don’t switch between EBITDA and FCF to make the number look better.

Worked Example 1: High-Growth Company

A SaaS product growing at 80% YoY but burning heavily:

Annual revenue growth: 80%
EBITDA margin: -30%

Rule of 40 Score = 80 + (-30) = 50

Score of 50, passes the rule of 40 comfortably. The growth rate is high enough to justify significant losses. This is the classic venture-backed growth profile: sacrifice margin for market share.

Worked Example 2: Profitable but Slow-Growth

A bootstrapped SaaS with stable revenue but strong margins:

Annual revenue growth: 15%
EBITDA margin: 35%

Rule of 40 Score = 15 + 35 = 50

Same score, 50. Two completely different businesses with the same rule of 40 score. This is a key insight: the rule of 40 is agnostic to which side of the equation you score on. A profitable-but-slow company and a high-growth-but-unprofitable company can both be healthy by this measure.

Worked Example 3: The Danger Zone

A SaaS product that’s neither growing fast nor profitable:

Annual revenue growth: 20%
EBITDA margin: -15%

Rule of 40 Score = 20 + (-15) = 5

Score of 5. This is the danger zone. The business is losing money without growing fast enough to justify it. This profile, moderate growth, significant losses, is where many SaaS companies stall out and run out of cash before reaching sustainability.

Worked Example 4: A €500K ARR Bootstrapped Product

Let’s ground this in real numbers for a typical NoNoiseMetrics user:

Situation:

ARR: €500,000 at start of year
ARR: €680,000 at end of year
Revenue growth rate: (680,000 - 500,000) / 500,000 × 100 = 36%
Gross margin: 78%
COGS (hosting, support, payment fees): €150,000
Operating expenses: €380,000
EBITDA: €680,000 - €150,000 - €380,000 = €150,000
EBITDA margin: €150,000 / €680,000 = 22%

Rule of 40 Score = 36% + 22% = 58

Score of 58, well above 40. This bootstrapped product is growing at a reasonable rate and generating real profit. The founder has a healthy balance and doesn’t need to choose between growth and sustainability.

For context on revenue growth rate calculation, see how to calculate revenue growth rate.

Rule of 40 Benchmarks

According to Bessemer Venture Partners, Battery Ventures, and public SaaS company data:

Stage	Median Rule of 40 Score	Top Quartile
< €1M ARR	20–35	40+
€1M–€5M ARR	30–45	50+
€5M–€20M ARR	35–50	60+
$50M+ ARR (public)	40–55	70+

Notable data points from public SaaS companies (2024):

Best-in-class companies (Veeva, Datadog, HubSpot at peak growth): Rule of 40 scores of 60–80
Median public SaaS company: 35–45
Companies that struggled: consistently below 20

What to take from benchmarks:

Below 20 is a serious efficiency problem
20–40 is average, not alarming, but not impressive
40–60 is healthy
60+ is exceptional, typically only seen in either high-margin businesses or high-growth companies

For broader SaaS benchmarks across multiple metrics, see SaaS benchmarks 2025.

Why the Rule of 40 Exists

The rule emerged from VC-backed SaaS investing as a quick heuristic to distinguish good-growth-with-acceptable-burn from bad-growth-with-excessive-burn. It became popular in investor conversations around 2015–2017 and was widely adopted because:

It captures the growth/margin tradeoff in a single number
It’s easy to benchmark across companies of different sizes and growth rates
It penalises both stagnation AND reckless spending simultaneously

The 40% threshold is somewhat arbitrary, there’s nothing mathematically special about 40. But it’s become the de facto standard and that network effect makes it useful as a conversation tool even if the exact number is debatable.

Rule of 40 for Bootstrapped Founders

The rule of 40 was designed for VC-backed SaaS companies where investors tolerate losses for growth. For bootstrapped founders, the calculus is different, you can’t sustain heavy losses without external capital.

This doesn’t make the rule of 40 irrelevant for bootstrapped SaaS. It makes it even more useful as a ceiling on spending. If you’re at 40% growth, you have permission to spend up to break-even (0% margin). At 20% growth, you need 20% EBITDA margin minimum to hit 40. This gives you a mathematical constraint on burn.

For bootstrapped founders specifically:

You likely can’t sustain negative margins, so your rule of 40 score leans heavily on the profit margin side
A bootstrapped SaaS at 15% growth and 30% EBITDA margin (score: 45) is in a stronger position than one at 30% growth and 5% margin (score: 35)
Profitability buys you optionality, the ability to weather slow growth periods without fundraising

See SaaS gross margin for how gross margin feeds into EBITDA margin, and EBIT vs EBITDA for SaaS for which profit metric is most relevant to your stage.

Limitations of the Rule of 40

It’s an annual metric, not a monthly one. Monthly revenue growth is not comparable to annual revenue growth. Make sure you’re using apples-to-apples comparisons, both metrics on the same time period.

It doesn’t distinguish quality of growth. A company growing through discounts, annual prepays that inflate current-year revenue, or aggressive sales spending can look great on rule of 40 while having underlying retention problems. Pair it with NRR and gross margin to validate.

It ignores cash flow timing. EBITDA doesn’t account for working capital changes or capex. A company can have strong EBITDA margin but terrible cash flow due to deferred revenue timing. For bootstrapped founders, cash flow matters more than EBITDA.

Small-company volatility. At €200K ARR, a single large customer win or loss can swing your growth rate by 20–30 points. Rule of 40 gets more meaningful as a metric when you have enough revenue that individual events don’t dominate the calculation.

How to Improve Your Rule of 40 Score

You have two levers: growth rate and profit margin. But they’re not independent:

Lever 1: Grow faster. New customer acquisition, reducing time-to-value, improving conversion from trial, and reducing churn all improve growth rate. See SaaS metrics for founders for the key metrics to optimise.

Lever 2: Improve margin. For SaaS products, gross margin is largely fixed by infrastructure costs. Operating margin is mostly a headcount and tooling decision. The fastest path to better EBITDA margin: audit your tool stack, automate manual workflows, and delay hiring.

Leverage the tradeoff deliberately. The rule of 40 explicitly allows you to trade margin for growth. If you have a clear growth opportunity, deliberately sacrifice margin by investing in acquisition. If growth has plateaued, shift to harvesting margin. Don’t do both poorly simultaneously, that’s how you land in the danger zone.

FAQ

What is the rule of 40 in simple terms?

The rule of 40 says your growth rate plus your profit margin should be at least 40%. If you’re growing at 30% per year and running at 15% profit margin, your score is 45, you pass. It’s a quick health check on whether you’re balancing growth and profitability appropriately.

Which profit metric should I use for the rule of 40?

The most common choice is EBITDA margin. Free cash flow margin is increasingly preferred by investors, especially for public companies. Operating income margin is another option. Pick one, use it consistently, and be explicit about which metric you’re using when sharing your score.

Is the rule of 40 relevant for bootstrapped SaaS?

Yes, but with important context. Bootstrapped founders typically can’t sustain negative margins, so their scores lean toward the profitability side rather than the growth side. A score above 40 is achievable without hypergrowth if margins are strong. The rule helps bootstrapped founders understand whether their growth rate justifies their spending level.

What’s a good rule of 40 score?

40 is the threshold. 50+ is strong. 60+ is exceptional. Below 20 is concerning. Median public SaaS companies score around 40–50. Early-stage companies often score lower as they invest in growth; mature profitable companies can score very high.

How often should I calculate my rule of 40 score?

Annually, using full-year revenue figures. Monthly or quarterly calculations introduce seasonality noise that can mislead. Track it annually and look for trends year-over-year. If your score drops significantly year-on-year without a deliberate explanation, investigate both your growth rate and your margin.

Can a company pass the rule of 40 while losing money?

Yes. If you’re growing at 60% annually and losing 15%, your rule of 40 score is 45, passing. This is the classic VC-backed growth company profile. The rule explicitly allows losses when offset by high growth. The question it asks is whether the growth justifies the losses, not whether you’re profitable.

How is the rule of 40 different from gross margin?

Gross margin measures the profitability of your core product (revenue minus COGS). The rule of 40 uses EBITDA or operating margin, which deducts all operating expenses including S&M and G&A. A SaaS company can have 80% gross margin but -20% EBITDA margin if it’s spending heavily on sales. Both matter. SaaS gross margin explains how gross margin relates to overall efficiency.

Does the rule of 40 apply to companies under €1M ARR?

It’s less reliable at very small scale due to revenue volatility. A €200K ARR business that closes a single €30K annual deal can see its growth rate swing dramatically. Apply the rule of 40 as a directional indicator at small scale, not a precise benchmark. Once you’re past €500K ARR, it becomes more meaningful.

What’s the connection between rule of 40 and SaaS valuation?

Revenue multiples in SaaS tend to correlate with rule of 40 scores. Companies above 60 typically command the highest multiples; those below 20 see significant discounts. The relationship isn’t linear or guaranteed, but rule of 40 score is one of the first numbers acquirers and investors look at when sizing up a SaaS business.

Know your growth rate and margins in real time. Connect Stripe to NoNoiseMetrics and track MRR growth, expansion, and all the inputs you need to calculate your rule of 40 score accurately.

Connect Stripe and track your metrics →

MRR Dashboard Template

Want to track the growth inputs for your rule of 40 score automatically? The MRR Dashboard Template gives you a ready-made structure for MRR, growth rate, and revenue movement, all the building blocks for the rule of 40 calculation.