SaaS Rule of 40 Net Burn-Adjusted Calculator
Rule of 40 traditionally uses growth + FCF margin. Net-burn-adjusted Rule of 40 substitutes net cash burn as % of ARR — a stricter measure preferred by 2026 SaaS investors who want true capital efficiency, not just operating margin.
Why Net Burn Beats FCF Margin
Traditional Rule of 40 uses FCF margin (FCF ÷ revenue). Net-burn-adjusted version uses cash burn ÷ ARR. The difference: burn is harder to manipulate via accounting; FCF includes working-capital swings that can mask quarterly health.
Healthy Net-Burn-Adjusted Bands
Top quartile 2026: R40 of 55+. Healthy: 40-55. Watch: 20-40. Below 20: requires plan revision. Companies clearing R40 = 60 (Rule of 60) get the highest valuation multiples in 2026 — typically 12-18x ARR vs 4-6x for R40 < 30.
How To Improve
Three levers: (1) Reduce burn faster than growth slows. Hard, but the biggest impact. (2) Push pricing on existing customers — net-new ARR with zero variable cost. (3) Cut paid acquisition spend; lean on organic + product-led. Most 2026 SaaS over-spends on paid where channel ROI has collapsed below 3:1.
Source: Bessemer Cloud 100 Q1 2026, SVB State of the Markets 2026. Last updated: May 2026.