By using this tool you acknowledge that all results are high-level estimates for educational purposes only — not financial, tax, legal, or investment advice, and not a formal valuation. Figures are rounded for display and may not sum exactly, though results remain directionally accurate. For real decisions, consult a qualified professional or talk to a CFO.

Free SaaS Efficiency Tool

Rule of 40 Analyzer

Growth rate plus profit margin, in one number — see where you land against the benchmark SaaS investors use to judge efficiency.

Year-over-year revenue growth rate (%) This year's revenue vs. last year's, as a percentage increase.

Profit margin (%) EBITDA margin or free cash flow margin. Enter a negative number if you're operating at a loss.

Please check the highlighted fields — growth rate must be between -100% and 10,000%, and profit margin between -10,000% and 100%.

Rule of 40 Calculator for SaaS

The Rule of 40 is one of the most widely used shorthand benchmarks in SaaS: add your revenue growth rate to your profit margin, and a healthy business should clear 40. It's popular precisely because it resists the trap of chasing growth at any cost or profitability at the expense of growth — it forces both numbers onto the same page.

How to Calculate the Rule of 40

This calculator takes your growth rate and margin and returns your Rule of 40 score along with what it signals. A company growing 55% with a -10% margin scores 45 and passes; a company growing 12% with an 8% margin scores 20 and does not — even though the second company is profitable.

What Metrics Are Used to Calculate the Rule of 40

The two inputs are your year-over-year revenue growth rate and your profit margin — most commonly EBITDA margin or free cash flow margin, though some use net income margin. Growth rate should reflect recurring revenue growth rather than one-time contracts, and margin should be calculated consistently period over period so the trend is comparable.

Where a company sits below 40 usually points somewhere specific — cost structure, pricing, or sales efficiency. Isolating which one is driving the gap is standard work for an FP&A engagement with the US Fractional CFO Alliance, and it's usually a faster fix than most founders expect.

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Frequently Asked Questions

What is the Rule of 40?

The Rule of 40 is a SaaS benchmark stating that a healthy company's revenue growth rate plus its profit margin should add up to 40% or more. It's a single number investors use to judge whether a company is balancing growth and profitability well.

How do you calculate the Rule of 40?

Add your year-over-year revenue growth rate percentage to your profit margin percentage (typically EBITDA margin or free cash flow margin). If the sum is 40 or higher, you're generally considered to be performing well by this measure.

Can a company have negative margin and still pass the Rule of 40?

Yes. A company growing at 60% with a -15% margin scores 45, which passes the benchmark. The Rule of 40 rewards fast growth even with a temporary loss, as long as the combined number clears 40 — but sustained heavy losses eventually catch up.

Is the Rule of 40 the same for early-stage and mature SaaS companies?

No. Early-stage companies are generally given more room to lean on growth over profit, since acquiring market share matters more early on. Mature companies are expected to lean more on margin, since triple-digit growth becomes harder to sustain at scale.

What should a company do if it's below the Rule of 40?

Identify which side is weak — growth or margin — and address that one first rather than trying to fix both simultaneously. A margin-side gap often points to cost structure or pricing; a growth-side gap often points to sales efficiency or retention.

What metrics are used to calculate the Rule of 40?

Year-over-year revenue growth rate and profit margin — typically EBITDA margin or free cash flow margin. Add the two percentages together; the sum is your Rule of 40 score.

What is a good Rule of 40 score?

40 or higher is the standard benchmark, but higher is generally viewed more favorably, especially for earlier-stage companies where investors expect growth to carry more of the score. Scoring meaningfully above 40 — 50 or more — is often seen as best-in-class.

Is the Rule of 40 only for SaaS businesses?

It originated in SaaS and is most commonly applied there because SaaS revenue is recurring and margins are relatively predictable, which makes the growth-plus-margin math meaningful. It's used less often outside SaaS, where revenue and margin structures vary more and the same combined threshold doesn't translate as cleanly.