Rule of 40 score
Board decks cite growth + margin as a single score—exactly two tunable inputs with one headline KPI. Layer segment splits when you fork this in Calclet.
Example scenario
A growth-stage SaaS operator reports 38% year-over-year booked revenue growth against comparably measured trailing revenue and pairs it with a 12% EBITDA margin after stock-based compensation policy choices are disclosed consistently quarter to quarter. The Rule of 40 score sums to 50, and with gap defined here as forty minus the score the gap reads −10, signaling ten points of cushion above the Rule of 40 line. Investors still dissect quality of revenue, net retention, and cash conversion beneath the headline ratio.
Rule of 40 score
YoY revenue growth % + profit margin %
Want a similar calculator on your website?
Describe your fields and formula in plain English, match your brand, and embed the widget anywhere—WordPress, Webflow, Shopify, or custom HTML. Capture leads when you're ready.
How to use the rule of 40 score
- Input YoY revenue growth (%) using the same revenue basis your leadership reports externally—typically GAAP subscription revenue or finance-approved annual recurring revenue growth, not billings spikes.
- Input operating or EBITDA margin (%) aligned with that revenue definition and consistent treatment of stock-based compensation.
- Read Rule of 40 score as the simple sum and interpret gap versus forty using your finance team’s sign convention for overperformance.
- Rerun scenarios on billings-normalized growth and cash-margin variants before comparing peers whose disclosures bundle different adjustments.
Rule of 40 context
- Classic Rule of 40 threshold
- Software investors popularized growth rate plus profitability margin targeting roughly 40 combined points as a balanced-screen shorthand for scale-ups trading off reinvestment and earnings.
- Growth versus margin tradeoffs
- High burn darlings can clear the bar with outsized growth and thin margins; mature vendors often contribute more margin with modest growth—either path can satisfy the combined score.
- Metric-definition variance
- Board packs disagree on GAAP revenue versus ARR, SBC inclusion, and free-cash-flow substitutions; cross-company comparisons require aligned definitions.
Best use cases
- Forecasting and scenario planning
- Client education and pre-qualification
- Budget and performance decision support
Frequently asked questions
Should I use GAAP revenue growth or ARR growth for the growth term?
Either works if margin uses the same revenue base and your stakeholders agree; mixing GAAP growth with ARR-normalized margin invites misleading Rule of 40 readings.
Is EBITDA margin or free cash flow margin the standard profit term?
EBITDA-oriented presentations dominate SaaS scorecards, but some firms publish Rule of 40 variants with free cash flow margin; label the variant explicitly in investor materials.
Does a score above forty guarantee a premium valuation?
No. Net retention, market size, capital efficiency, and revenue quality still drive multiples; the Rule of 40 is a screening heuristic, not a pricing formula.
Why would gap versus forty read negative when we are doing well?
This configuration defines gap as forty minus the score, so outperformance produces negative gaps; flip the sign logic in narrative if your board prefers positive numbers for upside.
Glossary
Scenario modeling
Testing multiple assumptions to estimate possible outcomes before execution.
Commercial intent
User behavior indicating readiness to buy, subscribe, or request a quote.
Related calculators
Category: SaaS financial benchmarksTopics: Rule of 40, YoY revenue growth, EBITDA margin
Last reviewed: 2026-05-07
Reviewed by: Calclet Growth Team