What Is the Rule of 40? Formula, 2026 Benchmarks, and When It Matters
The Rule of 40 is growth rate plus profit margin. The 2026 bar is still 40%. Benchmarkit's private SaaS median is 25%; top quartile is 43%. It starts to matter around $20M ARR.
The Rule of 40 says a healthy software company's year-over-year revenue growth rate plus its profit margin should sum to at least 40. Grow 40% at break-even, grow 20% at a 20% margin, or grow 50% while losing 10% — the combinations are equivalent on the score. It is a trade-off metric, not a growth trophy and not a profitability lecture.
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Brad Feld popularized the rule in February 2015, after a late-stage investor described it in a board meeting as a test for software companies at scale — "assume at least $50 million in revenue." Benchmarkit's 2026 SaaS and AI-Native Metrics (CY-2025 actuals, 342 B2B SaaS and AI-native companies; Rule of 40 n = 110) puts the private-company median at 25%, up 10 points from 15% the year before — the largest single-year gain in five years of that book — with the top quartile at 43%. The bar did not move. The typical company just got closer to it by spending less, while median growth slowed to 20%.
Key Takeaways
- Rule of 40 = YoY revenue growth (%) + profit margin (%). The target is still 40. Lock one margin definition (EBITDA, operating, or free cash flow) and do not mix it against a different benchmark.
- Benchmarkit CY-2025: private B2B SaaS median 25% (from 15%), 25th percentile 7% (from −4%), top quartile 43%+. More than half the market is still below the line.
- The 10-point jump came from the cost side: R&D 35% → 27% of revenue, S&M 37% → 35%, while median growth fell 26% → 20%. A higher score from slower growth and a thinner product budget is not the same company as 50% growth at −10% margin.
- The metric becomes a useful board test around ~$20M ARR. Below that, growth rate and CAC payback are cleaner. Feld wrote it for scaled software; treating a $4M ARR seed company as "failing Rule of 40" is a category error.
- Only the >50% growth cohort clears 40 at the median (57). The 31–50% growth band prints a median of 8 — investment compresses margin faster than the growth contribution offsets it. Decompose before you cut.
How to Calculate the Rule of 40
Score = YoY revenue growth rate + profit margin.
Feld's original examples still hold: 20 + 20, 40 + 0, 50 + (−10). All print 40. A company at 12% growth and 13% margin prints 25 — the 2025 private median — and is not "close" to 40 in any way that changes a valuation conversation.
Growth rate. Use year-over-year ARR or MRR, same definition every period. Feld preferred YoY MRR and then back-tested GAAP revenue so one-time services did not inflate the print. Do not annualize a single strong quarter and call it the growth input.
Profit margin. Three common bases, three different scores:
| Margin basis | What it includes | Who uses it | Distortion risk |
|---|---|---|---|
| EBITDA | Operating profit before interest, tax, D&A | Most private benchmarks, including Benchmarkit-style books | Ignores capex, stock-based compensation, working capital |
| Operating (EBIT) | After D&A, before interest and tax | Some public comps | Infrastructure-heavy SaaS looks worse than cloud-native peers |
| Free cash flow | Cash from operations minus capex | Late-stage and public investors; Bessemer Rule of X | Stricter; SBC and collections timing move it around |
Mixing an FCF-based score against an EBITDA-based median is the most common way a finance deck "beats" the rule. Pick one, label it, hold it.
What never enters. New-logo bookings that are not yet revenue. One-time professional services. A mid-year price increase annualized as if it had run for twelve months. Expansion helps only to the extent it already sits in the growth rate — which is why leaky gross revenue retention will show up here as a growth problem wearing a Rule of 40 badge.
2026 Benchmarks: Private vs Public, and Why They Disagree
Two clocks, two populations.
Private B2B (Benchmarkit / Aleph, June 2026, CY-2025). Median Rule of 40 25%. Top quartile 43%. Bottom quartile 7%. The whole distribution moved up — not just the leaders — because cost lines came down. Median growth is 20%. Hybrid subscription-plus-usage companies lead the 75th percentile at 43%, just clearing the line; non-seat subscription sits at an 18% median, often still in a spend-to-expand phase. That pricing split is the same structural gap as usage versus seat models: usage-based books printed 108% median NRR in the same survey, seat-based 98%.
By growth rate, same book:
| 2025 growth rate | Median Rule of 40 | What it is telling you |
|---|---|---|
| >50% | 57 | The only cohort that clears 40 at the median. Growth carries the score. |
| <10% | 19 | Profitability-oriented. The growth half is doing almost no work. |
| 31–50% | 8 | Lowest print. You are paying for growth that has not yet earned its margin. |
The middle band is the trap. A team that "should" be approaching 40 because growth looks healthy is often the furthest from it, because S&M and R&D required to hold 30–50% growth crush the margin half. Pairing high growth and high profitability at once is the rare case — which is why 40 is a top-quartile aspiration, not a median expectation.
Public SaaS (SaaSDB, April 2026, 172 companies, SEC EDGAR). Median Rule of 40 32.8. 61 companies above 40. Median EV/revenue 4.9×, median gross margin 74.3%. Public books run older, more annual, and more FCF-aware than a 110-company private survey. They are not a rebuttal of 25%. They are what the score looks like after the $20M–IPO filter has already been applied.
Feld's 2015 scale comment — $50M+ revenue — and Benchmarkit's 2026 comment — meaningful above ~$20M ARR — are the same warning with a decade of inflation and earlier professionalization. Below that, a 80% growth / −50% margin seed company and a 15% / 20% bootstrap both print noisy thirties and teach you nothing. Use payback and burn multiple until the base is large enough that a 5-point swing is a decision, not a rounding error.
Rule of 40 vs Rule of X vs the Inputs That Actually Move It
The Rule of 40 weights growth and margin 1:1. Public-market reality does not.
Bessemer's Rule of X multiplies growth before adding free-cash-flow margin: (growth rate × multiplier) + FCF margin. In a normalized tape they treat ~2× to ~3× as the conservative range — a point of growth is worth more than a point of profit because it compounds into the revenue multiple. Their late-2023 Cloud Index print: average Rule of 40 ~31%, average Rule of X ~50%, top decile ~48% Rule of 40 and ~80% Rule of X at a 2.3× multiplier. Their 2023 State of the Cloud note: Rule of 40+ names in that index traded ~1.7× higher than less efficient peers.
Use Rule of 40 as the shared language in a board pack. Use Rule of X when the question is "would public buyers pay up for this mix?" Do not optimize either score directly.
The inputs that move the number are the operating metrics already on the dashboard:
- Growth half. New-logo ARR plus expansion minus churn. If NRR is under 100% and GRR is sliding (Benchmarkit median GRR 84%, down from 88%), you are buying the growth half at a premium every quarter.
- Margin half. R&D, S&M, G&A as a percent of revenue. The 2025 recovery was an 8-point R&D cut and a 2-point S&M cut. That is not repeatable. You cannot cut your way to 40 two years in a row.
- GTM efficiency. Benchmarkit median CAC payback is 16 months; Magic Number 1.37. If those are not top-quartile, adding S&M to "get the growth half up" mostly lowers the score. Read that next to the B2B SaaS CAC benchmarks: blended CAC ratio $1.30 of S&M per $1 of ARR, new-name $1.63, expansion $0.80. Expansion is the cheap way to lift the growth half.
A product-led motion can help the score only if activation and expansion are real. Cheap self-serve growth with ugly GRR raises the growth print this year and the churn print next year. The Rule of 40 will not save you from a leaky bucket; it will just look fine until it does not.
What a Good Score Is in 2026
40 is still the target. It is also, on the private book, roughly the top-quartile line (43%). Plan accordingly.
| Your situation | A "good" 2026 print | What to manage instead if you miss |
|---|---|---|
| <$10–20M ARR, still finding the ICP | Do not manage to Rule of 40. A noisy 20–50 is common. | YoY growth, CAC payback, GRR. Feld: get to scale first. |
| $20–50M ARR, private, mixed growth | Trajectory toward 40 within 18 months. Median peers sit ~25. | Decompose: is the hole growth or margin? The 31–50% growth / 8 median band is the usual miss. |
| $50M+ ARR, raising or planning a process | 40+ on a labeled EBITDA or FCF basis, same basis as the buyer. | Rule of X if the buyer is public-comp oriented. Do not switch bases mid-process. |
| >50% growth, any scale | Median 57 on Benchmarkit. You can be margin-negative and still clear 40. | Keep CAC payback from blowing out. Growth that requires a 24-month payback is borrowed. |
| <10% growth, profitable | Median 19. You will not clear 40 on margin alone unless you are unusually fat. | Expansion and new motion, not another 2 points of G&A cut. |
| Hybrid subscription + usage | 75th percentile 43% — the only pricing architecture that clears at the top quartile in this book. | Packaging and forecasting, not a full rip to usage overnight. |
| Seat-based, NRR ≤98% | The growth half is fighting contraction. Score will drift with the installed base. | Pricing architecture and workflow depth, not a Rule of 40 OKR. |
A 25 is not a crisis at $8M ARR. A 25 is a problem at $80M ARR with a 2027 IPO story. Same number, different job.
A 30-Day Operator Test
Do not set "hit 40 this year" as an OKR until the formula matches the book.
Days 1–7 — Lock the definition. Write growth rate (ARR vs MRR, YoY, services in or out) and margin basis (EBITDA vs FCF vs operating) on one page. Recompute the last four quarters. If finance and the CEO cannot produce the same score in one sitting, stop targeting and reconcile.
Days 8–14 — Split the score. Put last year's growth points and margin points in two columns. A 25 made of 30 + (−5) is a different company from 8 + 17. The first needs efficiency and payback. The second needs a growth motion that does not destroy margin — usually expansion, not another demand-capture hire.
Days 15–21 — Benchmark the right row. Use Benchmarkit if you are private B2B. Use a public EDGAR screen if you are modeling a listing. Do not average them. Put ARR, growth band, and pricing model next to the number. If you are under ~$20M ARR, park the Rule of 40 and put payback, GRR, and NRR on the slide instead.
Days 22–30 — Move one lever, then re-read. One of: stop a channel with payback worse than 18 months; put expansion quota on the existing base; or freeze a cost line that did not produce growth. Recompute on the same basis. If the score rose because growth fell faster than costs, you did not improve the business — you printed the 2025 industry trick. If the score rose because expansion lifted growth at a stable margin, keep going.
Methodology
This is a 2026 planning brief, not a survey we ran. The private-company Rule of 40 median (25%), 25th percentile (7%), top quartile (43%), growth-band splits, R&D and S&M ratios, CAC payback, Magic Number, GRR, NRR-by-pricing, and ~$20M ARR threshold are from Benchmarkit's 2026 B2B SaaS and AI-Native Performance Benchmarks (1 June 2026; 342 companies; Rule of 40 n = 110; CY-2025 actuals), cross-checked against Aleph's public Rule of 40 write-up of the same book. The original definition, $50M-scale comment, YoY MRR preference, and EBITDA-then-backtest guidance are from Brad Feld, 3 February 2015. Rule of X formula, 2×–3× growth weighting, late-2023 Cloud Index averages, and the ~1.7× valuation note are from Bessemer Venture Partners (Rule of X atlas page and 2023 State of the Cloud). Public medians (32.8 Rule of 40, 61 of 172 companies above 40, 4.9× EV/revenue) are from SaaSDB's April 2026 State of Public SaaS Benchmarks, sourced to SEC EDGAR. No statistic appears here unless it was on a page we fetched. Private survey medians, public EDGAR medians, and a 2015 scale heuristic are not interchangeable.
Read Next
- B2B SaaS CAC Benchmarks 2026: What It Costs to Acquire a Customer
- SaaS Churn Rate Benchmarks 2026: What's a Good Rate by Segment
- SaaS Pricing Models Guide with AI Optimization Tactics
- What Is Product-Led Growth (PLG)?
- What Is Demand Generation vs Lead Generation?
FAQs
1. What is the Rule of 40 in SaaS?
It is year-over-year revenue growth rate plus profit margin. A healthy scaled software company should sum to at least 40. Grow fast and lose money, or grow slowly and print margin — the combinations that add to 40 are treated as equivalent on this score.
2. What is a good Rule of 40 score in 2026?
40%+ is still the target and, on Benchmarkit's private book, roughly top quartile (43%). The 2025 median is 25%. Below about $20M ARR the metric is noisy; growth rate and CAC payback are better tests.
3. How do you calculate the Rule of 40?
Add YoY ARR or MRR growth to EBITDA, operating, or free-cash-flow margin. Use the same margin every period and when you benchmark. Feld preferred YoY MRR plus EBITDA, then back-tested the other profit definitions.
4. Does the Rule of 40 use EBITDA or free cash flow?
Either, if you label it. EBITDA is the common private-company basis. Late-stage and public investors increasingly prefer FCF, and Bessemer's Rule of X is built on FCF margin. Do not compare an FCF score to an EBITDA median.
5. When does the Rule of 40 start to matter?
Around $20M ARR in the 2026 private benchmarks; Feld originally framed it for ~$50M+ software companies. Earlier than that, a high score is often just a high growth rate, and a low score is often just a small denominator.
Disclaimer: This content is provided for informational purposes only and does not constitute financial, investment, or operating advice. Rule of 40 figures reflect publicly reported research as of August 2026, from studies with different margin bases (EBITDA vs FCF), sample frames (private survey vs public EDGAR), and scale cutoffs. Benchmarkit numbers are finance-survey medians on CY-2025 actuals (n = 110 for Rule of 40). SaaSDB numbers are public-company filings. Treat them as directional peer checks, not board targets without your own cohort data.
