B2B SaaS Valuation Curves: Rule of 40 Efficiency Index, Net Revenue Retention & EV/ARR Multiples
A quantitative analysis of public and private SaaS valuation multiples, Rule of 40 correlations, Net Revenue Retention (NRR), and cash burn efficiency.
SaaS Valuation Multiple Calculator
Benchmark your EV/ARR multiple based on Rule of 40 score and NRR cohorts
Empirical Analysis & Findings
## Empirical B2B SaaS Valuation Multiples
Valuation multiples for subscription software companies have shifted from revenue-growth-at-all-costs to capital efficiency and durable net customer expansion.
### 1. The Rule of 40 Formula
$$\text{Rule of 40 Score} = \text{YoY Revenue Growth Rate (\%)} + \text{Free Cash Flow Margin (\%)}$$
A company growing revenue at 25% with a 15% FCF margin scores exactly 40%, demonstrating balanced operational health.
| Rule of 40 Score | Average EV / Forward ARR Multiple | Cost of Customer Acquisition Payback | Net Revenue Retention (NRR) |
|:-----------------|:---------------------------------:|:------------------------------------:|:---------------------------:|
| > 50% (Elite) | 12.5x - 18.0x | < 12 Months | > 125% |
| 40% - 50% | 8.0x - 12.4x | 12 - 18 Months | 110% - 124% |
| 25% - 39% | 4.5x - 7.9x | 18 - 24 Months | 100% - 109% |
| < 25% (Impaired) | 2.0x - 4.4x | > 24 Months | < 100% |
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Frequently Asked Questions
How is the SaaS Rule of 40 calculated?
The Rule of 40 score equals the year-over-year revenue growth percentage plus the free cash flow (FCF) margin percentage. Scores >=40% command premium valuation multiples.
What is the valuation premium for B2B SaaS companies with >120% Net Revenue Retention (NRR)?
Companies with >120% NRR trade at an average 2.8x multiple premium over peers with <100% NRR because existing customer expansion covers churn without sales spend.
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