The Rule of 40: the formula, 2026 benchmarks, and how to actually hit it
The Rule of 40 says a healthy SaaS company’s annual revenue growth rate plus its profit margin should add up to at least 40. Grow 40% with a 15% margin and you score 55, well clear. Grow 60% while burning at a minus 20% margin and you still score 40, exactly on the line.
VC Brad Feld popularized the metric in 2015. It became the single number boards and investors reach for to judge whether you are balancing growth against profitability. Companies that consistently clear 40 trade at roughly twice the revenue multiple of those that do not.
The catch nobody tells you: the number is meaningless until you specify which margin you used, what stage you are at, and how you weight the two halves.
The Rule of 40 formula
Rule of 40 = Revenue Growth Rate (%) + Profit Margin (%), and you want the total at 40 or above. That is the whole formula.
The growth half is year-over-year recurring revenue growth. The margin half is your profit margin, usually EBITDA (earnings before interest, taxes, depreciation, and amortization) or free cash flow.
The point of combining them is that growth and profit trade off. Early on you spend to grow. Later you slow down and bank margin. The rule says the sum should stay above 40 in either mode.
How to calculate the Rule of 40, with three worked examples
Add your trailing-twelve-month revenue growth rate to your profit margin, and be explicit about which margin you mean. Take a company at $10M in ARR that grew from $7.1M last year. That is 40% growth.
If it posts $1.5M in EBITDA on $10M revenue, the margin is 15%. Score: 40 plus 15 equals 55. Comfortably above the line.
Here are three companies at the same score line, each taking a different path:
| Path | Growth | Margin | Score | What it looks like |
|---|---|---|---|---|
| High-growth, burning | 60% | minus 20% | 40 | Series B land-grab, spending to win the market |
| Balanced | 40% | 15% | 55 | Scaling efficiently, default-alive (profitable on current trajectory) |
| Slow-growth, profitable | 20% | 20% | 40 | Mature, cash-generative, growth tapering |
All three pass or sit on the line, and none is automatically better. The right path depends on your stage.
A company chasing a winner-take-most category should run 60% growth and negative margin. A $200M-ARR business at 20% growth and 20% margin is doing exactly what it should. Forcing the mature company to grow 60% would be reckless. Demanding the land-grab company hit break-even would hand the market to a competitor.
EBITDA vs free cash flow: the margin you pick changes everything
The same company can pass or fail depending on which margin you plug in, so always state the basis. EBITDA margin is EBITDA divided by revenue. Free-cash-flow (FCF) margin is operating cash flow minus capex, divided by revenue, and it runs stricter because it captures capital spending and the cash reality of stock-based comp.
The gap is not academic. As of May 2026, only 15% of 55 public SaaS companies passed the Rule of 40 on an EBITDA basis (8 of 55), per Aventis Advisors. On a free-cash-flow basis, 46% passed (25 of 55) in the same dataset. Same companies, same quarter, the pass rate triples.
So when an investor says you need to clear 40, ask which margin. FCF flatters subscription businesses that collect annual contracts upfront, because cash lands before it is recognized as revenue. EBITDA is the tougher, more common default.
If you are comparing yourself to a benchmark, use the same definition the benchmark used.
2026 benchmarks: what percentage of SaaS companies actually pass
Most SaaS companies do not pass, and the share has been falling. Here is where things stand.
| Cohort | Share passing Rule of 40 | Source |
|---|---|---|
| Public SaaS, EBITDA basis (May 2026) | 15% (8 of 55) | Aventis Advisors |
| Public SaaS, FCF basis (May 2026) | 46% (25 of 55) | Aventis Advisors |
| Public SaaS exceeding 40 (Q4 2025) | about 20% of 58 names | industry data |
| Private SaaS with 5M+ ARR | about 32% | KeyBanc |
| Private SaaS under 30M revenue | about 9% | BCG 2025 |
| Public SaaS, 2021 vs 2023 | 48% then 34% | KeyBanc |
The median public SaaS company scores around 22 to 28 on an EBITDA basis. The median private company sits near 12, built from roughly 10% growth and a 6% EBITDA margin. McKinsey found only about a third of SaaS companies ever reach the Rule of 40, and a typical company exceeds it just 16% of the time across its whole life.
One detail tells you what to fix. KeyBanc’s drop from 48% passing in 2021 to 34% in 2023 came almost entirely from slowing growth, not worse margins. Companies cut costs hard. The growth never came back to the same level.
Why passing roughly doubles your revenue multiple
Clearing the Rule of 40 is worth real money at exit or raise. Companies passing on an FCF basis traded at a median 4.8x EV/Revenue in 2026 versus 2.7x for those that failed, a 74% premium (Aventis Advisors).
Top-decile performers reached a median 6.1x. Pair a Rule of 40 score above 50 with net revenue retention above 120% and the multiple stretches to 7x to 9x. That is the combination buyers pay up for: efficient growth plus a customer base that expands on its own.
Treat the rule as a valuation lever, not a vanity badge. Two points of margin or five points of growth can move your multiple by a turn of revenue. On a $50M-ARR business, that is tens of millions of enterprise value.
Is the Rule of 40 right for early-stage startups?
No. It was built for companies at scale, often $50M or more in revenue, and it breaks below that. Only about 9% of private SaaS companies under $30M in revenue pass, per BCG’s 2025 benchmark of 100-plus companies. The numbers at seed and Series A swing too hard to read.
Here is the trap. At $2M ARR growing 150% with a minus 80% margin, your score is 70, which looks elite. A quarter later one big contract slips and the same company posts a wildly different number. The score is noise at that size.
The better early-stage test is burn multiple, net cash burned divided by net new ARR added. It answers a sharper question: how many dollars are you torching to add one dollar of recurring revenue? Below 1.0x is elite. Here is roughly where to sit by stage in 2025:
| Stage | Healthy burn multiple |
|---|---|
| Seed | 2.5x to 3.4x |
| Series A | 1.2x to 2.0x |
| Growth stage | about 1.4x |
| 100M+ ARR | at or below 1.0x |
AI-native companies are running tighter, around 0.8x to 1.2x, versus a traditional SaaS median near 1.6x. The shift in investor attention backs this up: 56% of seed investors and 83% of Series C-plus investors now call burn multiple critical to a deal. Watch your quick ratio and burn multiple at seed and Series A, then graduate to the Rule of 40 around Series B or C when the numbers settle.
Beyond 40: Bessemer’s Rule of X
The Rule of 40 weights growth and margin equally, which is wrong, because growth compounds and margin gains are linear. Bessemer’s Rule of X fixes that: (Growth Rate x 2) + FCF Margin.
The 2x is not arbitrary. A 1% increase in growth rate moves a public cloud company’s valuation multiple about 2.3x as much as a 1% increase in FCF margin, per Bessemer. Growth this year produces a bigger base to grow on next year. A point of margin is just a point of margin.
So the paths to 40 are not equal in the eyes of the market. If you can buy growth at a reasonable burn multiple, the market rewards it more than the equivalent points of margin. Fewer than 2% of SaaS companies ever score above 60 on the plain Rule of 40, so do not let the weighting talk you into spending past your means.
How to actually hit 40
You hit 40 by working three levers: growth, retention, and margin. Most founders over-index on new logos and ignore the cheaper wins in the base.
Protect the growth half by killing churn. Every point of churn is a point you have to re-earn before you grow. Run the numbers in a churn-rate calculator, then attack the causes. Better onboarding gets customers to value before they second-guess the purchase.
Grow the base without new acquisition cost. Expansion revenue is the most efficient growth there is. Build pricing tiers and usage-based components so revenue rises as customers grow. Track it with a net revenue retention calculator. Above 120% is where multiples climb.
Take margin where growth is already slowing. If you are past $50M ARR and growth is tapering toward 20%, that is when you convert spend into profit. Match the path to the stage: high growth and negative margin early, balanced in the middle, profitable and steady late.
Check the math with a Rule of 40 calculator, and pair it with LTV to CAC so you know your growth is paying for itself rather than buying a number for the board deck.
Track your Rule of 40 in real time from Stripe
The Rule of 40 is an operating dial, not a quarterly trophy you rebuild from a spreadsheet before each board meeting. Growth, churn, and net new ARR all move continuously off your billing data, so your score moves continuously too.
The growth half comes straight out of Mowt’s MRR and ARR tracking, updated the moment revenue moves in Stripe. Watch your live Rule of 40 the way you watch MRR, and you catch a growth slowdown the quarter it starts, not the quarter after the board notices.
FAQ
What is the Rule of 40 in SaaS?
It is a heuristic stating that a healthy SaaS company’s annual revenue growth rate plus its profit margin should sum to at least 40. It lets investors judge growth and profitability with one number. You can grow fast and burn cash, or grow slowly and run profitably, but the combination must clear 40.
How do you calculate the Rule of 40?
Add your year-over-year revenue growth rate to your profit margin, both as percentages. For example, 35% growth plus 10% EBITDA margin equals 45, which passes. Use trailing-twelve-month recurring revenue growth for the cleanest read, and stay consistent about which margin definition you use.
Is the Rule of 40 a good benchmark for early-stage startups?
Not really. It was designed for companies at scale, often $50M or more in revenue, and figures at seed and Series A are too volatile to interpret. Only about 9% of sub-$30M-revenue private companies pass, so early-stage founders are better judged on growth rate and burn multiple, then graduate to the Rule of 40 around Series B or C.
Do you use EBITDA or free cash flow for the margin?
Both are used, and the choice matters enormously. EBITDA margin is the most common default. Free-cash-flow margin is stricter and preferred by many investors because it captures capex and stock-based-comp realities. In May 2026, 46% of public SaaS companies passed on an FCF basis but only 15% on EBITDA, so always state which margin you mean.
What percentage of SaaS companies pass the Rule of 40?
A minority, roughly 11% to 30% in most years. As of 2025 to 2026, about 15% to 20% of public SaaS companies pass on an EBITDA basis, KeyBanc puts private companies near 32%, and McKinsey found a typical company exceeds the rule only about 16% of the time.
About the Author
Matt Smith
Serial entrepreneur and former big 4 consultant turned SaaS operator. Built and scaled analytics and data warehouses platforms at multiple enterprise Stripe companies before founding Mowt. Passionate about making complex metrics accessible to every founder.