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Rule of 40

Growth rate + profit margin health check.

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  • Rule of 40 score

    50

What is Rule of 40?

The Rule of 40 is a software health heuristic: revenue growth rate (%) plus profit margin (%) should be at least 40. It balances growth ambition with profitability discipline.

Why is Rule of 40 Important?

  • Balanced scorecard

    Prevents celebrating growth that destroys margin — or margin that stalls growth.

  • Stage flexibility

    Early companies can lean growth; later ones need more profit.

  • Investor shorthand

    Widely used in SaaS performance discussions.

  • Tradeoff clarity

    Makes the growth-vs-profit choice explicit.

  • Trend tracking

    Shows whether operating leverage is improving.

How is Rule of 40 Calculated?

Formula

Rule of 40 = Revenue growth % + Profit margin %

Add year-over-year revenue growth percentage to your chosen profit margin percentage (often EBITDA or free cash flow margin).

Factors Affecting Rule of 40

  1. 01

    Growth rate basis

    YoY ARR/revenue definition must be consistent.

  2. 02

    Margin definition

    EBITDA vs FCF changes the score.

  3. 03

    One-time items

    Unusual gains/losses distort margin.

  4. 04

    Investment cycles

    Hiring or market expansion can temporarily depress the score.

  5. 05

    Category maturity

    Growth norms differ by market stage.

  6. 06

    Accounting policy

    Align with finance before external use.

Rule of 40 vs. Growth-only KPIs

Rule of 40

  • Combines growth and profitability.
  • Useful for mature and scaling SaaS.
  • Highlights sustainable performance.

Growth-only metrics

  • Focus on top-line speed.
  • Useful early when share matters most.
  • Can hide inefficient burn.

What is a Rule of 40 Calculator?

A Rule of 40 calculator adds growth rate and profit margin into a single score so leadership can assess balanced performance.

Benefits of Using a Rule of 40 Calculator

  • Instant score

    See if you clear the 40 threshold.

  • Scenario planning

    Trade growth and margin levers visually.

  • Board prep

    Frame the growth/profit narrative cleanly.

  • Benchmarking

    Track the score over quarters.

  • Decision support

    Pressure-test hiring and spend plans.

How to Use a Rule of 40 Calculator

  1. Step 1

    Enter growth %

    Use YoY revenue or ARR growth.

  2. Step 2

    Enter margin %

    Use EBITDA or FCF margin consistently.

  3. Step 3

    Read the score

    Sum is your Rule of 40 result.

  4. Step 4

    Discuss tradeoffs

    Decide whether to push growth, margin, or both.

What Is a Good Rule of 40?

A score of 40 or higher is the classic target. Below 40 is not automatically failure — it signals you must explain the tradeoff. Early-stage companies often sit below 40 while investing; later-stage companies are expected to approach or exceed it.

Who's it for?

Founders & operators

Get a fast read on unit economics or channel efficiency without waiting on a spreadsheet rebuild.

Digital Marketers

Use this calculator to benchmark performance, allocate budget, and brief stakeholders with a clear, shared metric.

Agencies & growth teams

Standardize reporting across clients and campaigns, and turn calculations into optimization recommendations.

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