SaaS Rule of X vs Rule of 40 Calculator 2027

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.