The Rule of 40 for SaaS: Balancing Growth and Profitability
Growth Rate + Profit Margin ≥ 40%. This simple formula determines whether your SaaS business is healthy. Here's how to calculate it, where top companies score, and how to improve your number.
What Is the Rule of 40?
The Rule of 40 states that a healthy SaaS company's revenue growth rate plus profit margin should equal or exceed 40%.
Rule of 40 Score = Revenue Growth Rate (%) + Profit Margin (%)
Examples:
- Growing 60% with -20% margins → Score: 40 ✓
- Growing 30% with 10% margins → Score: 40 ✓
- Growing 10% with 30% margins → Score: 40 ✓
- Growing 20% with 5% margins → Score: 25 ✗
The beauty of this metric is that it acknowledges the tradeoff between growth and profitability. A fast-growing company burning cash can be just as healthy as a slower-growing profitable company — as long as the sum exceeds 40.
Why It Matters
The Rule of 40 correlates strongly with SaaS company valuations. Companies above the threshold trade at significantly higher revenue multiples. Investors use it as a quick health check because it captures both sides of the growth-profitability equation.
| Rule of 40 Score | Health Rating | Typical Valuation Impact |
|---|---|---|
| Below 20 | Struggling | 1-3× revenue multiple |
| 20-30 | Below average | 3-6× revenue |
| 30-40 | Healthy | 6-10× revenue |
| 40-60 | Strong | 10-20× revenue |
| 60+ | Elite | 20×+ revenue |
Improving Your Score
You can improve the Rule of 40 score from either side:
Growth side: Improve conversion funnel, invest in channels with proven ROI, reduce churn (which directly improves net growth), and enable expansion revenue.
Profitability side: Optimize CAC, increase pricing, reduce infrastructure costs, and improve operational efficiency.
The most common pattern: early-stage companies score high on growth but negative on profitability, then shift toward balanced as they mature. The Revenue Modeler shows your projected growth rate and profit margin at each year mark — calculate your Rule of 40 trajectory across all three scenarios to ensure you're on a path toward the threshold.
For benchmarks on what growth rates to expect at different stages, see our SaaS growth rate benchmarks.