Rule of 40: The SaaS Efficiency Benchmark Explained
Quick Answer
- *Rule of 40 = Revenue Growth Rate (%) + Profit Margin (%) — a combined score of 40 or higher indicates a healthy, balanced SaaS business
- *A score of 40+ is good; 60+ is excellent; below 40 suggests the company is burning too much relative to its growth rate
- *The metric was coined by Brad Feld (Foundry Group) and popularized by Bessemer Venture Partners’ cloud benchmarks
- *In the current higher-interest-rate environment, investors weight profitability more heavily — a company growing 20% with 30% margins (score: 50) may be valued higher than one growing 60% with –30% margins (score: 30)
What Is the Rule of 40?
The Rule of 40 is a benchmark for SaaS and subscription software companies. It states that a company’s revenue growth rate plus its profit margin should add up to at least 40. The formula is simple:
Rule of 40 Score = Revenue Growth Rate (%) + Profit Margin (%)
A company growing at 35% per year with a 10% EBITDA margin scores 45 — above the threshold. A company growing at 20% but burning 25% of revenue scores –5 — well below it.
The metric was coined by venture capitalist Brad Feld of Foundry Group around 2015 and quickly gained traction after Bessemer Venture Partners began including it in their annual State of the Cloud reports. Today it’s one of the most commonly cited efficiency benchmarks in SaaS investor memos, board decks, and M&A diligence.
Why the Rule of 40 Matters
SaaS companies face a fundamental tradeoff: you can invest heavily in growth (sales, marketing, R&D), which boosts revenue but destroys near-term profitability. Or you can optimize for margins, which improves profitability but may sacrifice competitive positioning. The Rule of 40 quantifies where a company sits on that spectrum.
According to McKinsey & Company research on software companies, those that exceed the Rule of 40 consistently trade at two to four times higher revenue multiplesthan those that don’t. Bessemer’s cloud index data shows a near-linear correlation between Rule of 40 scores and EV/Revenue multiples across public SaaS companies.
In the zero-interest-rate era (2020–2021), investors tolerated negative margins for hypergrowth companies. The calculus shifted in 2022–2026 as rates rose. Profitability now carries more weight in the formula. A balanced score of 50 (say, 25% growth + 25% FCF margin) increasingly commands stronger multiples than a 50-point score skewed toward pure growth (60% growth – 10% margin = 50).
Rule of 40 Score Interpretation
| Score | Interpretation | Investor Signal |
|---|---|---|
| 60+ | Elite / hypergrowth | Premium multiple; rare at scale |
| 40–59 | Healthy & efficient | Strong; investable by most growth funds |
| 20–39 | Below benchmark | Caution; needs improvement plan |
| 0–19 | Struggling | Distressed signal unless very early stage |
| Below 0 | Burning cash without growth | Red flag; survival risk |
Example Calculations
Here’s how the score plays out across different growth and margin combinations:
| Company Scenario | Growth Rate | Profit Margin | Rule of 40 Score | Status |
|---|---|---|---|---|
| Hypergrowth startup | 80% | –20% | 60 | Elite |
| Scaling Series C | 45% | 5% | 50 | Healthy |
| Mid-market SaaS | 25% | 20% | 45 | Healthy |
| Mature profitable SaaS | 10% | 35% | 45 | Healthy |
| Struggling grower | 30% | –15% | 15 | Below benchmark |
| Slow & unprofitable | 8% | –20% | –12 | Red flag |
Notice that a mature SaaS company growing 10% can still hit 45 if its FCF margins are 35%. The Rule of 40 rewards efficiency regardless of which side of the equation delivers it.
Which Profit Metric Should You Use?
There’s no universal standard — and that’s a source of confusion. Here’s how the three main options compare:
EBITDA Margin
Earnings before interest, taxes, depreciation, and amortization. Most commonly used in investor presentations and board-level reporting. Best for comparing companies with different capital structures. Does not account for stock-based compensation (SBC), which can be significant at SaaS companies.
Free Cash Flow (FCF) Margin
Operating cash flow minus capital expenditures. Widely considered the most accurate measure because it reflects real cash generated by the business. Bessemer Venture Partners specifically recommends FCF margin for Rule of 40 calculations. The downside: FCF can be lumpy quarter-to-quarter due to working capital timing.
Net Income Margin (GAAP)
Least commonly used for Rule of 40 because it includes SBC, depreciation, and one-time items that can distort comparisons. Useful for public company reporting obligations but generally avoided for this metric.
| Metric | Best For | Key Caveat |
|---|---|---|
| EBITDA margin | Cross-company comparison | Excludes SBC; can flatter |
| FCF margin | True cash efficiency | Lumpy; CapEx-dependent |
| Net income margin | GAAP reporting | Distorted by non-cash items |
The safest approach: calculate Rule of 40 using both EBITDA and FCFand disclose which you’re using. Investors will ask.
Rule of 40 by Growth Stage
The benchmark means different things depending on where you are in the company lifecycle:
- Pre-$5M ARR: Rule of 40 doesn’t apply. High burn is expected. Focus on product-market fit, not efficiency metrics.
- $5M–$20M ARR: Start tracking it. Investors will ask at Series B. A score below 20 warrants explanation.
- $20M–$100M ARR: The benchmark matters significantly. Below 40 is a yellow flag in fundraising conversations.
- $100M+ ARR: Rule of 40 is table stakes for IPO readiness and public market positioning. Below 30 at this scale is a real problem.
- Public company: Institutional investors track it quarterly. It directly influences analyst price targets and multiple expansion.
Top Public SaaS Companies by Rule of 40 Score
Based on recent fiscal year data (revenue growth + FCF margin or EBITDA margin, depending on what companies report):
| Company | Revenue Growth | FCF/EBITDA Margin | Rule of 40 Score |
|---|---|---|---|
| Palantir (PLTR) | ~26% | ~36% (FCF) | ~62 |
| Veeva Systems (VEEV) | ~15% | ~38% (FCF) | ~53 |
| Datadog (DDOG) | ~25% | ~25% (FCF) | ~50 |
| Snowflake (SNOW) | ~29% | ~18% (FCF) | ~47 |
| HubSpot (HUBS) | ~20% | ~18% (FCF) | ~38 |
Note: figures are approximate, based on publicly available annual reports, and can vary depending on the profit metric and time period used. Always verify against the company’s most recent 10-K or earnings release.
Rule of 40 vs Rule of 60: The AI-Era Benchmark
As AI-native companies emerge with structurally different economics — faster time-to-value, lower support costs, higher gross margins — some investors have started using a Rule of 60 as the threshold for truly exceptional companies.
The Rule of 60 follows the same formula (growth rate + margin) but raises the bar to 60. It acknowledges that the best AI-era SaaS companies are building with compounding advantages: AI reduces headcount per dollar of ARR, margins expand faster as products mature, and customer acquisition can be partially automated.
| Benchmark | Threshold | Context |
|---|---|---|
| Rule of 40 | Score ≥ 40 | Standard SaaS health benchmark |
| Rule of 60 | Score ≥ 60 | AI-era hypergrowth benchmark |
The Rule of 60 isn’t an official standard — it’s a conversational benchmark gaining traction in venture circles. Don’t benchmark against it unless your investor base is explicitly using it.
Common Mistakes When Using Rule of 40
Mixing Metrics Inconsistently
Using EBITDA for one period and FCF for another produces incomparable scores. Pick one and stick with it.
Ignoring Stock-Based Compensation
SBC is a real cost. A company with 30% EBITDA margins but 15% SBC is less efficient than it appears. Many analysts back SBC out of EBITDA to get a cleaner picture. Bessemer’s reports increasingly highlight SBC-adjusted Rule of 40 scores.
Applying It to Non-SaaS Businesses
Rule of 40 was designed for recurring-revenue software. Applying it to marketplaces, hardware companies, or transactional businesses produces misleading results. The high gross margins inherent in pure software are what make the formula meaningful.
Ignoring Trend Direction
A company scoring 38 today but trending toward 45 is more interesting than one sitting at 42 but declining. Always look at the direction of the score over the last 4–6 quarters, not just the current snapshot.
Calculate your Rule of 40 score
Calculate Your Rule of 40 Score →Frequently Asked Questions
What is the Rule of 40?
The Rule of 40 is a SaaS benchmark that states a healthy software company’s revenue growth rate plus profit margin should equal or exceed 40. It was coined by Brad Feld (Foundry Group) and popularized by Bessemer Venture Partners. It balances the growth-vs-profitability tradeoff that all SaaS companies navigate.
What is a good Rule of 40 score?
A score of 40 or above is considered healthy. A score of 60 or above is excellent and typically reserved for elite hypergrowth or AI-native companies. Below 40 is a yellow flag — not fatal, but it suggests the company is spending more on growth than the growth rate justifies, or it isn’t growing fast enough for its cost structure.
Which profit metric should I use — EBITDA, free cash flow, or net income?
No universal standard exists. EBITDA is most widely used for cross-company comparisons. Free cash flow (FCF) is arguably more accurate because it reflects actual cash generated. Net income is least preferred because non-cash items distort it. Bessemer specifically recommends FCF margin. Whatever you choose, disclose it clearly — investors will compare your calculation to their own.
Does the Rule of 40 apply to early-stage startups?
Not meaningfully below $10–$20M ARR. Early-stage companies are expected to burn capital aggressively in pursuit of product-market fit and initial growth. Investors start paying attention to Rule of 40 around Series B and take it seriously from Series C onward. Pre-revenue and seed-stage startups should focus on growth rate and gross margin, not Rule of 40.
What is the Rule of 60?
The Rule of 60 is an emerging benchmark for AI-native SaaS companies where the threshold is 60 instead of 40. It reflects faster growth expectations and the structural margin advantages of AI-powered products. Companies like Palantir have been cited in this context. It’s not an official standard — it’s a venture community benchmark gaining traction as AI fundamentally changes SaaS unit economics.
How does Rule of 40 affect SaaS valuation multiples?
McKinsey research found that SaaS companies exceeding the Rule of 40 trade at two to four times higher revenue multiples than those below it. Bessemer’s cloud index shows a strong correlation between scores and EV/Revenue multiples. In the current interest rate environment, balanced scores (growth + profitability) command stronger multiples than pure-growth scores, because investors discount long-duration cash flows more heavily and want evidence of near-term unit economics.