Quick answer
How do you calculate Rule of 40?
Use Rule of 40 score = Growth rate + Profit margin. Enter the matching values above to calculate the result instantly.
What it measures
Understanding Rule of 40
Combine recurring-revenue growth and profit margin into the SaaS Rule of 40 score. The rule frames the tradeoff between growth and profitability but does not prescribe one ideal mix.
Interpretation
What the result means
A 42% score means the selected growth rate and profit margin sum to 42 percentage points.
Action
How to use it
Document the exact revenue and profit definitions, then compare the trend and similar-stage companies.
Limits
What it leaves out
The score ignores company size, capital efficiency, retention quality, cash needs, and differences among margin definitions.
The math
Rule of 40 formula
Worked example
Example calculation
- Calculation
- 28% + 14%
- Result
- 42% Rule of 40 score
Step by step
How to use this calculator
- 1Enter revenue growth rate, profit margin.
- 2Keep every input on the same time period and measurement basis.
- 3Review the result, then change one assumption at a time to test scenarios.
Decision support
When this calculator is useful
- SaaS performance reviews
- Investor reporting
- Growth-profit tradeoff analysis
Common questions
Frequently asked questions
Which inputs should I use for Rule of 40?
Use revenue growth rate, profit margin, measured from the same source and period. Include only values that match the definitions shown beside each field.
Why might two Rule of 40 calculations differ?
The systems or accounting policies may define revenue growth rate, profit margin differently. Compare the time period, scope, source, and treatment of exceptional items before comparing results.
How often should I recalculate Rule of 40?
Recalculate when any input changes materially and on the same reporting cadence used for the decision. Save the source and date of each input so the trend remains comparable.
Can I use Rule of 40 by itself?
No single metric captures the full decision. Use the result with the related measures, assumptions, and limitations shown on this page.
Calculation reviewed: 2026-06-18. CalcPilot uses the formula shown above and tests representative values during the production build. See our methodology and correction policy.
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