Burn Multiple vs Rule of 40
Burn multiple and the Rule of 40 summarize different aspects of growth. Burn multiple links cash consumed to absolute ARR added; the Rule of 40 combines percentage revenue growth with a chosen margin. They can support the same review, but one cannot be substituted for the other.
Key differences
| Question | Burn Multiple | Rule of 40 |
|---|---|---|
| What inputs? | Net cash burn and net new ARR in the same period. | Revenue growth percentage plus an explicitly defined profit margin. |
| What does size change? | The denominator is dollars of ARR added. | The growth percentage depends on the starting revenue base. |
| What is the useful follow-up? | Explain the cash cost of each added ARR dollar. | Inspect growth and margin separately, even when their sum is similar. |
One scenario, two measures
Hypothetical worked scenario
Two fictional companies each grow 50% and report a −10% free cash flow margin, so both score 40 under that convention. One begins at $1 million annual revenue and the other at $10 million.
The identical Rule of 40 scores do not establish identical cash needs. The larger company operates on a much larger dollar base. Computing burn multiple requires each company’s actual cash burn and change in ARR.
It is not valid to derive burn multiple from the Rule of 40 score alone. ARR, period revenue, and cash timing are related but distinct inputs.
Which should you use?
- Use the Rule of 40 as a compact discussion of growth and profitability, always showing the margin basis and both components.
- Use burn multiple when the immediate question is how much cash growth consumed. Pair it with available cash and the forecast spending schedule.
- For an early or rapidly changing business, inspect absolute values and cohort evidence. Percentage growth off a tiny base and net new ARR near zero can each make a headline ratio unstable.
Where comparisons can mislead
- A Rule of 40 score using EBITDA margin will differ from one using free cash flow margin.
- Neither measure supplies a company valuation or a universal instruction to increase or cut spending.
Explore the full guides: Burn Multiple and Rule of 40.
Sources and methodology
The references below explain the underlying methods. Our worked scenarios use hypothetical figures; they are not company results or current market benchmarks.
- David Sacks / Craft Ventures: The Burn Multiple
Original 2020 explanation of net burn divided by net new ARR.
- Bessemer: The Rule of X
Discussion of growth, free cash flow margin, and the limitations of the Rule of 40.
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