SaaS Rule of X Calculator
Bessemer Venture Partners' Rule of X weights ARR growth more heavily than free cash flow margin (typically 2x), reflecting that growth compounds while margins are linear. Calculate your Rule of X and compare to Cloud 100 medians.
Rule of X vs Rule of 40
The Rule of 40 (growth + FCF margin ≥ 40) treats growth and margin equally. Bessemer's Rule of X weights growth 1.5-2x, reflecting that ARR growth compounds while FCF margin is linear. A 30% growth + 30% margin = same Rule of 40 as 50% growth + 10% margin, but Rule of X (2x) gives the 50% grower 50% higher score.
Why Investors Prefer Rule of X
Public SaaS revenue multiples correlate ~2x more strongly with growth rate than with margin. Bessemer's Cloud 100 analysis shows top-decile growers trade at 12-20x revenue while top margin companies trade at 8-12x. Rule of X formalizes this — investors should reward growth more heavily in early-stage and mid-stage SaaS.
Stage-Appropriate Weighting
Early-stage (pre-Series B): 2x growth weight is appropriate. Growth compounds rapidly and product-market fit must be proven before margins matter. Mid-stage (B-D): 1.5x weight. Late-stage (E+/public): 1x weight = Rule of 40, because growth slows and margins become the durability signal.
Source: Bessemer Venture Partners Cloud 100 2024 report, Brad Feld Rule of 40 origins, public SaaS multiples analysis. Last updated: May 2026.