Rule of 40 Calculator

Frequently Asked Questions

What is the Rule of 40?

Growth Rate (%) + Profit Margin (%) ≥ 40% indicates a healthy SaaS business. Trade-off framework: high-growth companies can run lower margins (or losses); profitable companies grow slower. A SaaS at 60% growth, -20% margin = 40 (passing). Below 40 = either growth too slow or burn too high.

Which margin should I use for Rule of 40?

Standard is EBITDA margin or free cash flow margin. Some use operating margin. Be consistent in tracking over time. Never use net income margin (one-time tax benefits distort it).

Is Rule of 40 a hard cutoff?

No - it's a benchmark. Below 40 in early stage (high growth investment) is acceptable if trajectory is improving. Above 40 consistently is impressive. Top public SaaS companies hit 50-60. Investors use it as a screening filter, not a strict pass/fail.

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How This Calculator Works

The Rule of 40 is a single health check for subscription businesses: year-over-year revenue growth rate (%) + profit margin (%). This tool adds the two numbers you enter and scores the sum - ≥40 passes, ≥60 is best-in-class, 20–40 is below benchmark, and under 20 is concerning. The idea: a company can trade growth for profitability or vice versa, but the combined figure should clear 40.

The Core Trade-Off It Captures

Early-stage SaaS is expected to burn cash to grow fast - 80% growth at −40% margin still scores 40. A mature SaaS should be highly profitable while growing slower - 15% growth at 25% margin also scores 40. The rule says both are healthy; what is not healthy is being slow and unprofitable. It is the single most-cited benchmark by SaaS investors for exactly this reason.

Which Margin to Use - This Matters

The rule is only meaningful if the margin input is consistent. Most investors use free cash flow margin or EBITDA margin, not GAAP net margin (which is distorted by stock-comp and D&A). Whatever you pick, use it consistently across periods and peers. A company can "pass" on EBITDA margin and badly fail on FCF margin - state which one you mean. Use ARR or recurring-revenue growth, not total revenue including one-off services.

Where the Rule Breaks Down

Sub-scale companies: below ~$5–10M ARR the rule is noisy - a tiny base produces huge growth percentages that flatter the score.

It is a snapshot, not a trend. A 45 driven by collapsing growth and rising margin (cost-cutting) is very different from a 45 with accelerating growth.

Quality of growth matters: 40 from efficient, retained revenue beats 40 from discounted, high-churn revenue.

How to Use the Score

Treat the Rule of 40 as a triage signal, then look underneath it. If you pass, confirm growth is durable (net revenue retention > 100%) and the profitability is real cash, not accounting. If you fail, the diagnosis is in the split: weak growth points to go-to-market or product-market fit; weak margin points to bloated CAC or cost structure. Pair this with NRR, CAC payback, and burn multiple for a full picture.

Rule of 40 Calculator

Frequently Asked Questions

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