Calculate your SaaS Rule of 40 score — the primary benchmark investors use to evaluate growth-profitability balance in SaaS companies.
| Company | ARR / Revenue | Growth | FCF Margin | Rule of 40 |
|---|---|---|---|---|
| Datadog | $2.1B | 25% | 26% | 51 |
| ServiceNow | $9.7B | 23% | 27% | 50 |
| Veeva Systems | $2.4B | 16% | 32% | 48 |
| HubSpot | $2.4B | 21% | 16% | 37 |
| Monday.com | $900M | 35% | 6% | 41 |
| Median BVP Cloud Index | Varies | 18% | 14% | 32 |
The Rule of 40 was popularized by Brad Feld and Fred Wilson around 2015 as a quick heuristic for evaluating SaaS company health. The insight: growth and profitability are inversely correlated in early-stage SaaS, so you need a combined benchmark.
The formula is deceptively simple: Revenue Growth Rate (%) + Profit Margin (%) ≥ 40
EBITDA margin is most common in VC discussions because it is easier to calculate for private companies. FCF margin is preferred by public market investors because it reflects actual cash generation after capex. For most pre-IPO SaaS companies, using EBITDA margin is standard and appropriate.
The Rule of 40 states that a healthy SaaS company's revenue growth rate plus profit margin should equal or exceed 40. Popularized by Brad Feld and Fred Wilson, it provides a single number that balances the growth-profitability tradeoff. A company at 60% growth can operate at -20% margins. A slower-growing company at 15% needs 25%+ margins to pass.
For private companies, EBITDA margin is standard and most VC-backed companies report it this way. For public companies, Free Cash Flow (FCF) margin is increasingly preferred because it is harder to manipulate and reflects actual cash economics. Operating margin (GAAP) is the most conservative. Whichever you choose, be consistent and disclose which margin you are using.
At pre-$1M ARR, Rule of 40 is less relevant because investors focus on growth rate and NRR. At $1M-$10M ARR (Series A territory), it starts to matter. Above $10M ARR, it is a primary benchmark for Series B/C investors and strategic buyers. Above $50M ARR, it directly influences revenue multiples in both private and public markets.
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