Rule of 40 Calculator
Calculate the Rule of 40 — the SaaS investor's single-number health metric. Add YoY revenue growth % to profit margin %. 40+ is healthy, 60+ is best-in-class public SaaS.
Rule of 40 Calculator
Growth + margin inputs
Margin definition + stage context
Rule of 40 isoline — different ways to hit 40
Industry benchmark comparison
How to use the Rule of 40 Calculator
Pull a clean YoY revenue growth figure
Use trailing-12-month revenue divided by the prior 12 months, minus one — not a single-quarter snapshot. Early-stage SaaS often uses ARR (annual recurring revenue) growth instead of GAAP revenue because deferred revenue distorts short windows. Whatever you choose, be consistent across periods. Avoid the temptation to use "best quarter annualised" — investors will compute the trailing number anyway.
Pick a margin definition and stick with it
The three common choices are Free Cash Flow margin (most-cited by public-market analysts and the Bessemer Cloud Index), EBITDA margin (friendlier to growth-stage SaaS still investing heavily), and Adjusted Operating Income margin (often used by IPO-stage companies excluding stock-based compensation). FCF is the strictest because it includes capex and working capital. Pick one and label it clearly — the worst answer is a Rule of 40 score whose margin definition is ambiguous.
Read the score against the verdict bands
Below 0 is distressed (margin so negative even strong growth cannot save it). 0–30 is underperforming the median public SaaS. 30–40 is borderline — investors call this "almost fundable." 40–60 is healthy and passes the canonical rule. 60+ is best-in-class, the territory of Snowflake and peak-era Datadog. The decile context line tells you where you sit in the public-SaaS distribution.
Use the isoline table to find your growth-vs-margin trade-off
Every row in the isoline table sums to exactly 40 — they show the different shapes a "passing" SaaS can take. You can be 60% growth at -20% margin (hyper-growth, burning cash) or 0% growth at +40% margin (mature cash cow) and pass either way. The benchmark comparison table shows where Snowflake, ServiceNow, Datadog, Salesforce, HubSpot, and Asana sit. Compare yourself honestly — investors will.
Rule of 40 — the SaaS investor's single-number filter
The Rule of 40 is the most-cited single-number health metric in SaaS investing. The formula is brutally simple: add your year-over-year revenue growth rate (in percent) to your profit margin (in percent), and the sum should be at least 40. A company growing 50% per year can pass at -10% margin. A company growing 10% per year needs at least +30% margin to clear the bar. A 0% growth, 40% margin business — a cash-cow profile — passes too. The rule encodes a deep truth about subscription businesses: at the early stage, growth is the dominant value driver; at the mature stage, margin is. The combined number gives a single comparable across the entire SaaS lifecycle.
Where the 40 came from — Brad Feld, 2015
The Rule of 40 was popularised by venture capitalist Brad Feld (Foundry Group) in a 2015 blog post that codified what late-stage SaaS investors had been muttering at board meetings for years. Feld's framing was that a SaaS company should be able to either (a) grow fast and burn cash, (b) grow moderately and break even, or (c) grow slowly and throw off cash — but in all three cases the combined score should land at 40 or above. The 40 itself was empirically derived from a sample of public SaaS companies that consistently traded at premium revenue multiples. The threshold has held up remarkably well across two market cycles — through the 2021 SaaS bull run when growth was valued absurdly highly, and through the 2022–2024 correction when margin discipline came back into fashion. In both regimes the 40 line remained the rough boundary between "premium SaaS" and "discount SaaS" valuation multiples.
Rule of 40 is the SaaS investor's first filter. A company below 40 has to explain why; a company above 60 doesn't have to justify anything.
FCF margin vs EBITDA margin vs Adjusted Operating Income — the honest debate
The biggest dispute in Rule of 40 calculation is which margin definition to use. Free Cash Flow margin is the strictest and the favourite of public-market analysts and the Bessemer Cloud Index — it includes capex, working capital movements, and the cash impact of stock-based compensation timing. EBITDA margin excludes those items and is friendlier to growth-stage SaaS still investing heavily; it is the standard choice in private-market term sheets and KeyBanc's SaaS Survey. Adjusted Operating Income margin is the IPO-stage favourite because it strips out stock-based compensation (often 15–25% of revenue at top SaaS companies). The same company can post a 45 on FCF basis, a 55 on EBITDA basis, and a 65 on Adj-Op basis — all "correct," all different. The cardinal sin is not picking the wrong one but failing to label it. When you see a Rule of 40 number with no margin definition attached, assume the speaker chose the flattering version.
The growth-vs-profitability trade-off, encoded in one number
The reason Rule of 40 became so dominant is that it elegantly handles the growth-vs-profitability trade-off that defines SaaS. Most other metrics force a choice: LTV:CAC measures unit economics in steady state; CAC payback measures cash efficiency; net revenue retention measures product stickiness. None of them tell you whether the company as a whole is creating value at its current operating mode. Rule of 40 does. A 40% growth company at break-even is creating roughly the same combined value as a 0% growth company at 40% margin — both pass. This lets investors compare a hyper-growth Series C company to a mature public SaaS using the same yardstick. The T2D3 pattern (triple, triple, double, double, double — Neeraj Agrawal's growth template) implicitly assumes Rule of 40 compliance: a company tripling revenue per year can absorb significant burn and still pass.
The ASEAN SaaS angle
Regional SaaS faces structural headwinds on Rule of 40. Smaller addressable markets mean shorter growth runways — a Singapore SaaS targeting only ASEAN may exhaust its TAM by Series B, forcing the growth side of the equation down before margins have had time to expand. Yet ASEAN SaaS unicorns like Carousell, Carro, and PatSnap have demonstrated that the rule still applies — successful regional players have generally hit 40+ by the time they raise growth rounds, often via aggressive margin expansion to compensate for slower growth than US peers. Bessemer's Cloud Index APAC segment shows median Rule of 40 scores trailing US public SaaS by roughly 10 points — Singapore and Australia leading the region, Southeast Asia broader trailing. The implication for ASEAN founders: do not assume the rule is "softer" because the market is smaller. Regional VCs apply the same 40 threshold, sometimes stricter (45+ at Series A is increasingly the bar) precisely because TAM gives less margin for error if unit economics drift later.
10 Things to Know About the Rule of 40
The Rule of 40 was popularised by VC Brad Feld in a 2015 blog post. The 40 threshold was empirically derived from public SaaS companies trading at premium revenue multiples.
Snowflake has routinely posted Rule of 40 scores above 60 in recent quarters — high-30s growth combined with mid-20s FCF margin. That is the territory the market rewards with 15-25x revenue multiples.
Bessemer's State of the Cloud reports the median public SaaS Rule of 40 score lives around 25–30 — well below the canonical threshold. Most public SaaS companies fail the Rule of 40 on any given quarter.
The top decile of public SaaS posts scores of 70+. ServiceNow, Datadog, CrowdStrike, and Adobe have all hit this band in their best quarters — premium-multiple territory.
The T2D3 growth pattern (triple, triple, double, double, double — Neeraj Agrawal's SaaS template) implicitly assumes Rule of 40 compliance throughout. A 200% growth company can absorb -160% margin and still pass.
FCF margin vs EBITDA margin vs Adj. Op Income can swing the same company's score by 20+ points. Always label which margin you used — silent margin choice is the most common Rule of 40 manipulation.
Salesforce at megacap scale typifies the mature profile: ~11% growth + ~33% FCF margin = ~44. Passes the rule on the margin side rather than the growth side — same valuation logic, different shape.
ASEAN SaaS typically trails US public SaaS Rule of 40 medians by ~10 points (Bessemer Cloud APAC). Regional VCs increasingly require 45+ at Series A to compensate for smaller TAM.
A company can pass at 60% growth with -20% margin or at 0% growth with +40% margin — the rule is agnostic about which lever you pull. This is the famous "isoline" — every combination summing to 40 looks the same to the rule.
The rule held up through both the 2021 SaaS bull run (growth valued absurdly) and the 2022–24 correction (margin discipline back in fashion). The 40 threshold remained the rough boundary between premium and discount valuation multiples in both regimes.
Frequently Asked Questions
-
The Rule of 40 was popularised by venture capitalist Brad Feld of Foundry Group in a 2015 blog post that codified what late-stage SaaS investors had been muttering at board meetings for years. The 40 threshold was empirically derived from public SaaS companies that consistently traded at premium revenue multiples. The rule has held up across two market cycles since.
-
Free Cash Flow margin is the strictest and the favourite of public-market analysts and the Bessemer Cloud Index — it includes capex, working capital movements, and SBC cash timing. EBITDA margin is friendlier for growth-stage SaaS still investing heavily and is the standard in private-market term sheets. Adjusted Operating Income margin strips out stock-based compensation and is the IPO-stage favourite. The same company can post a 45 on FCF basis and a 65 on Adj-Op basis. The cardinal sin is not picking the wrong one but failing to label it.
-
Brad Feld derived the 40 empirically from a sample of public SaaS companies that consistently traded at premium revenue multiples. It was not theoretically motivated — it was a back-fit to where the market drew the line between "premium SaaS" and "discount SaaS" valuations. The threshold has held up remarkably well across two market cycles, which is why it persists. A more sophisticated view: 40 is the rough sum of (capital cost of growth) + (expected return), so a business clearing 40 is creating value above its cost of capital.
-
Yes, if growth is high enough. A company growing 60% per year at -20% margin scores 40 — that passes. The rule is agnostic about which lever you pull. The implicit logic: if growth is high, the burn is funding future revenue that will eventually compound into much larger margin dollars. The risk is that growth decelerates before margins inflect — that is the failure mode of many late-2010s SaaS that traded at high multiples on growth alone.
-
An isoline is a line of equal value. The "Rule of 40 isoline" is the set of all growth-margin combinations that sum to exactly 40. The scenario table shows seven points on that line — from hyper-growth/burning-cash (60% growth, -20% margin) at one end to mature cash-cow (0% growth, +40% margin) at the other. Every point passes the rule equally. The shape you choose depends on stage, market, and capital availability.
-
LTV:CAC is a unit-economics metric — it tells you whether a single customer is profitable. Rule of 40 is a company-level metric — it tells you whether the business as a whole is creating value at its current operating mode. A company can have great LTV:CAC (say 5x) but fail Rule of 40 because S&M overhead, R&D, and G&A consume the contribution before it reaches the bottom line. Both metrics matter; they answer different questions. Investors look at LTV:CAC first to assess the engine, then Rule of 40 to assess the whole car.
-
FCF margin in particular is volatile because it includes working capital and capex timing. A SaaS company can post a +5% FCF margin one quarter and -10% the next purely because deferred-revenue collection timing shifted. The standard practice is to use trailing-12-month figures for both growth and margin — that smooths out the quarterly noise. Public-market analysts almost always cite TTM Rule of 40, not single-quarter Rule of 40.
-
Sort of. The Rule of 40 was designed for software SaaS where gross margins are 70-85% and customer acquisition is the dominant cost. For lower-gross-margin subscription businesses (marketplaces, hardware-as-a-service, consumer subscription), the threshold often gets adjusted downward (Rule of 30 or Rule of 25 is sometimes cited). For non-subscription businesses (retail, manufacturing) the rule breaks down entirely — growth-vs-margin is a different equation when you do not have recurring revenue.
-
Smaller addressable markets mean ASEAN SaaS often exhausts its TAM faster, forcing growth deceleration earlier in the company lifecycle. Bessemer's Cloud Index APAC segment shows median Rule of 40 scores trailing US public SaaS by roughly 10 points. The successful exceptions — Carousell, Carro, PatSnap — have generally compensated via aggressive margin expansion. Regional VCs increasingly apply a 45+ Series A bar precisely because TAM gives less margin for unit-economics drift later.
-
No. All calculation happens entirely in your browser via JavaScript — no server, no analytics on the inputs, nothing sent over the network. Open DevTools → Network and watch — there is zero outbound traffic from the calculator. The benchmark figures (Snowflake, ServiceNow, etc.) are static constants baked into the page, not fetched from any API.
Related News
You may be interested in these recent stories from our newsroom.
-
Snowflake jumps 36 per cent in a day on an earnings beat and a US$6 billion AWS chip deal
Snowflake had its best day as a public company on 28 May, closing up 36 per cent after a clean first-quarter beat and a five-year, US$6 bill...
-
MAS Scraps Mandatory Financial Advice for Most Complex Product Buyers in Retail Shake-Up
Singapore retail investors buying structured notes, derivatives and investment-linked policies will no longer need mandatory financial advic...
-
SEC Rewrites Float Rules, PSE Moves to Implement Them — Clearing the Path for GCash's USD 1B Philippine IPO
The SEC lowered the public float floor for large Philippine issuers in February 2026. The PSE followed with a consultation paper in April. T...
75 more free tools
Calculators, converters, security tools — no signup.