SaaS Rule of X vs Rule of 40 Calculator 2027
Compare SaaS Rule of 40 vs Rule of X (Bessemer Venture Partners) for 2027 — weighted growth + margin scoring. Predicts public-market valuation multiples.
Rule of 40 Origin
Brad Feld + Fred Wilson, ~2015. Sum of YoY revenue growth + operating margin must exceed 40. Healthy SaaS = either 40% growth + 0% margin OR 20% growth + 20% margin. Both 'pass'.
Rule of X Origin
Bessemer Venture Partners + Goldman Sachs research 2023. Public markets weight growth 2-3x over margin. Growth × 2 + margin ≥ 80 = top quartile. Reflects post-2022 reality that growth scarce + valued.
Why Rule of X Better Predicts
Pure Rule of 40 treats 50% growth as equal to 50% margin. But public markets pay much higher multiples for high-growth (Rule of X reflects this). Snowflake 50% growth + 0% margin worth more than 25/25.
Implications for Founders
If your Rule of 40 is exactly 40 (say 40% growth + 0% margin), Rule of X = 80. That's borderline. To get top valuation, push growth past 50% even at lower margin (-10 to -20%).
Source: openview.com SaaS Benchmarks 2026, bessemer.com Rule of X. Last updated: May 2026.
Frequently Asked Questions
What weighting should I use?
Bessemer uses 2 for SaaS. Some analysts use 3 (e.g., Goldman). Use 2 as default. Use 3 if you're early-stage or in growth-favored sector (AI, vertical SaaS).
Should I use EBITDA or FCF?
Bessemer uses FCF. EBITDA can be gamed (excludes SBC, capex, working capital). FCF = real cash. If you must use EBITDA, subtract SBC for SaaS realism.
What's a great Rule of X?
100+ exceptional (Snowflake, ServiceNow). 80-100 strong. 60-80 healthy. <40 needs work. Some unicorns hit 150+ at peak (Datadog, MongoDB).