Rule of X

TL;DR

Rule of X is an emerging SaaS efficiency framework that values growth more heavily than profitability — typically reported as Growth Rate + (Profitability Margin × Multiplier), where the multiplier reflects the relative importance of profitability. The Rule of 40 is the canonical version (multiplier of 1); newer variants include Rule of 60 (faster growth bias) and revenue-multiple-weighted versions. The metric matters because pure Rule of 40 understates the value of high-growth SaaS in private and growth-stage contexts.

What is Rule of X?

Rule of X (sometimes Rule of 50, Rule of 60, or generalised Rule of N) is a flexible SaaS efficiency framework that varies the canonical Rule of 40 formula to weight growth more (or less) heavily than profitability. The standard Rule of 40 sums growth rate and EBITDA margin equally; Rule of X adjusts the weighting based on the operator's view of what matters at the company's current stage.

The most common variants: Rule of 60 (target Growth + Margin ≥ 60, used by faster-growth SaaS where Rule of 40 is too lax), Growth-Adjusted Rule of 40 (multiplies growth rate by some factor before summing), and ICONIQ's variant that weights growth at 1.5–2× margin to better reflect investor preferences in growth-stage SaaS.

The framework matters because Rule of 40 was developed for public SaaS where growth and profitability trade-offs are roughly symmetric. For growth-stage private SaaS, growth typically deserves higher weight — investors pay more for one point of growth than one point of margin. Rule of X formalises this asymmetry.

Why Rule of X matters for operators

Rule of X better reflects the value of growth-stage SaaS than the standard Rule of 40. A company growing 80% with −20% margin scores 60 on Rule of 40 (passing) but is structurally more attractive than a company growing 30% with 20% margin (also 60 on Rule of 40). Rule of X with growth-weighted multipliers makes the asymmetry visible.

The framework also informs strategic prioritisation. A company optimising for Rule of 40 might cut growth investment to lift margin; a company optimising for Rule of 60 (with growth-weighted multiplier) keeps growth investment because each point of growth contributes 1.5–2× as much to the score as a point of margin. The strategic implications differ.

The trap is over-engineering custom rules. Custom multipliers that aren't published or peer-comparable produce internal-only scores with no benchmarking value. Use standardised versions (Rule of 40, Rule of 60) for external reporting; reserve custom Rule of X for internal trajectory tracking.

Rule of X variants and formulas

Rule of 40 (canonical):
  Growth Rate + EBITDA Margin ≥ 40

Rule of 60:
  Growth Rate + EBITDA Margin ≥ 60
  Used by high-growth SaaS where 40 is too lax.

Growth-Weighted Rule of 40 (ICONIQ-style):
  (Growth Rate × Multiplier) + EBITDA Margin
  Multiplier typically 1.5–2× to reflect growth premium.

Rule of X with Free Cash Flow:
  Growth Rate + FCF Margin
  Replaces EBITDA margin with FCF for cash-discipline focus.

Rule of 50 / 70 / etc:
  Same formula, different threshold targets at different stages.

Example — Growth SaaS company:
  Growth rate (YoY): 60%
  EBITDA margin: −10%

  Rule of 40: 60 + (−10) = 50 — passing
  Rule of 60: 60 + (−10) = 50 — failing the higher bar
  Growth-weighted Rule of 40 (1.5x):
    (60 × 1.5) + (−10) = 90 − 10 = 80 — strong

The same company looks different across frameworks.
The framework choice matters as much as the underlying metric.

Rule of X benchmarks by stage

Stage	Rule of 40 healthy	Rule of 60 healthy	Growth-weighted RO40 (1.5x)	Best framework for stage
Series A SaaS	Not yet meaningful	Not yet meaningful	>100	Burn multiple + magic number
Series B SaaS	20–35	Not yet meaningful	60–90	Burn multiple + Growth-weighted RO40
Growth SaaS	30–45	40–55	70–110	Growth-weighted RO40
Scale SaaS	40–55	55–70	90–130	Rule of 40 + Rule of 60
Public SaaS (mature)	45–60	60–75	100–140	Rule of 40 (standard)
Vertical / mission-critical	55–75	70–90	120–160	Rule of 60

Sources: ICONIQ Topline Report 2025; Bessemer State of the Cloud 2025; OpenView SaaS Benchmarks 2025; Fairview customer data.

Common mistakes when using Rule of X

1. Mixing frameworks within the same conversation. Reporting 'Rule of X is 80' without specifying the multiplier produces ambiguity. The same company hits 50 on Rule of 40 and 80 on Growth-weighted Rule of 40. Always specify the framework when reporting.

2. Over-engineering custom rules. A custom Rule of X with proprietary multipliers becomes a private metric that boards and investors don't recognise. Use standardised versions (Rule of 40, Rule of 60) for external reporting; reserve custom versions for internal trajectory tracking.

3. Treating Rule of X targets as scale-independent. Rule of 40 healthy ranges shift with stage — Series B at 25 is normal; scale SaaS at 25 is concerning. Compare against stage benchmarks; absolute targets without stage context produce wrong conclusions.

4. Optimising one variant to game another. A company can lift Rule of 40 by improving margin (cutting growth investment) and harm Growth-weighted Rule of 40 in the process. The framework choice affects what the right strategic move is.

5. Using Rule of X without supporting metrics. Rule of X is a composite; it hides what's driving improvement or degradation. Always track underlying components — growth rate trajectory, EBITDA margin trajectory, gross margin — alongside the composite.

How Fairview tracks Rule of X variants

Fairview's Operating Dashboard computes Rule of 40, Rule of 60, and Growth-weighted Rule of 40 alongside underlying components — so the framework choice is visible and operators can see how each interpretation views the business differently.

The Next-Best Action Engine flags framework divergence: "Rule of 40 is 38 (just below threshold), but Growth-weighted Rule of 40 (1.5x) is 78 (well above). The standard framework underestimates the strength of your growth investment. For internal strategic decisions, the growth-weighted view is more accurate; for board reporting, lead with both numbers and explain the gap."

→ See how Fairview tracks Rule of X

Rule of X vs Rule of 40 vs Bessemer Efficiency Score

Rule of 40 is the canonical version of Rule of X; Bessemer Efficiency Score is a separate framework that adds NRR weighting.

	Rule of X	Rule of 40	Bessemer Efficiency Score
Definition	Generalised growth + margin framework	Growth + EBITDA margin = 40	NRR + growth + burn multiple
Inputs	Growth + margin (variable weight)	Growth + margin (equal weight)	NRR + growth + burn
Scope	Variable — multiple variants	Single canonical formula	Single canonical methodology
Best for	Stage-appropriate efficiency view	Cross-stage public SaaS comparison	SaaS peer benchmarking

At a glance

Category: Profit Intelligence
Related: 5 terms

Frequently asked questions

What is Rule of X in simple terms?

Rule of X is a flexible SaaS efficiency framework that generalises the Rule of 40 — varying how heavily growth is weighted versus profitability. Common variants: Rule of 60 (higher bar for fast-growth SaaS), Growth-weighted Rule of 40 (multiplies growth rate by 1.5–2× before summing with margin), and Rule of X with FCF margin instead of EBITDA. The variant choice reflects the operator's strategic priorities.

Why does Rule of X exist if Rule of 40 already does?

Rule of 40 weights growth and profitability equally, which is appropriate for public SaaS where the trade-off is roughly symmetric. For growth-stage private SaaS, growth typically deserves higher weight — investors pay more for one point of growth than one point of margin. Rule of X with growth-weighted multipliers formalises this asymmetry that pure Rule of 40 misses.

Which Rule of X variant should you use?

Stage- and audience-dependent. Series B SaaS: Growth-weighted Rule of 40 (1.5–2x growth multiplier). Growth SaaS: Standard Rule of 40 + Rule of 60 (track both). Scale and Public SaaS: Standard Rule of 40 is the right benchmark. Most operators report multiple variants for board decks; the variant choice signals strategic priorities.

What's a healthy Rule of X?

Variant- and stage-dependent. Standard Rule of 40 healthy ranges: Series B 20–35, Growth 30–45, Scale 40–55, Public 45–60. Rule of 60 (faster growth) raises each by ~15–20 points. Growth-weighted Rule of 40 (1.5x) roughly doubles the score. Always specify which variant when reporting.

Can you customise the Rule of X multiplier?

Yes, but for internal use only. Custom multipliers with proprietary methodology produce private metrics that boards and investors don't recognise. Standardised versions (Rule of 40, Rule of 60) are peer-comparable; custom versions are not. Use standardised for external reporting, custom for internal trajectory tracking.

Sources

Fairview is an operating intelligence platform that computes Rule of 40, Rule of 60, and Growth-weighted Rule of 40 side by side — so framework choice becomes a strategic decision, not a defaulted-into reporting habit. Start your free trial →

Siddharth Gangal is the founder of Fairview. He built the multi-variant Rule of X view after watching a growth-stage SaaS company underinvest in growth because Rule of 40 said they were 'on track' — when growth-weighted analysis would have shown they were leaving 20% YoY growth on the table for marginal margin gains.

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