# SaaS Rule of 40 Calculator

- **URL:** https://codeasystem.com/calculators/business/saas-rule-of-40-calculator/
- **Category:** business
- **Description:** Score your software company on the rule of 40: revenue growth percentage plus profit margin should beat 40.
- **Primary output:** Rule of 40 score: 47%

## Inputs
- Annual revenue growth (name: `growth`, type: number, example: 35)
- Profit margin (name: `margin`, type: number, example: 12)

## Outputs
- Rule of 40 score: 47%
- Revenue growth rate: 35%
- Profit margin: 12%
- Verdict: Passing; balancing growth and profitability well

## Formula / methodology
```
Score = Revenue growth % + Profit margin %   (pass ≥ 40)
```

The rule of 40 captures a portfolio-level truth: growing fast usually costs money, and printing money usually slows growth. Adding the two percentages asks whether the combination is strong overall; a 60%-grower losing 15% on margin scores 45 and passes, while a flat-growth 50%-margin business also passes at 50. Either profile can be healthy; weakness on both fronts cannot.

## Assumptions & limitations
- Growth is year-over-year revenue growth; margin is EBITDA or operating margin, consistently chosen.
- Designed for software/subscription businesses above rough-product-market fit.
- A screening heuristic, not a valuation model; context like burn multiple and retention completes the picture.

## How to use
1. **Enter growth rate**; Year-over-year revenue growth percentage from your latest full period.
2. **Enter profit margin**; EBITDA or operating margin; whichever your board reports, applied consistently.
3. **Read the score**; At or above 40 passes the benchmark; the verdict row spells out the balance you struck.

## Example
Growing 35% a year with a 12% profit margin scores 47 on the rule of 40; comfortably passing the benchmark.

Result for these inputs:

```
Rule of 40 score: 47%
```

## About this calculator
### The insight behind the sum

Before the rule of 40 became venture shorthand circa 2015, boards argued past each other: growth advocates defended losses, profitability advocates attacked them. The sum reframes the argument; spend on growth freely, provided the total score clears 40. It converts a philosophical fight into one comparable number.

### What different profiles look like

- Hypergrowth: 80% growth − 40% margin = 40; passing while burning heavily.
- Cash machine: 5% growth + 38% margin = 43; passing while growing slowly.
- Trouble: 10% growth + 5% margin = 15; neither fast nor rich enough.

Public SaaS data shows scores clustering near the line, with top decile performers clearing 60; useful calibration for private-company ambitions.

## FAQs
### Which margin should I use?

EBITDA margin is the common choice; operating margin is stricter and increasingly preferred. Either works; just use the same basis as any benchmark you compare against.

### Does it apply outside SaaS?

It was built for software economics with high gross margins. Services and hardware businesses fail it structurally, so don’t force the comparison.

### Can the score be negative?

Yes; shrinking revenue plus negative margin sums below zero, which correctly reads as a turnaround situation rather than a growth story.

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Last updated: 2026-08-23 · Version: 1.0.0 · [HTML version](https://codeasystem.com/calculators/business/saas-rule-of-40-calculator/)