What is a good SaaS magic number?

Roughly above 0.75 is often read as efficient enough to invest more, and below 0.5 as a signal to fix conversion first — but read it with margin, churn, and payback, not alone.

How is the SaaS magic number calculated?

Divide net-new ARR in a quarter by the prior quarter's sales-and-marketing spend, allowing a lag for that spend to convert into revenue.

Magic number vs burn multiple?

The magic number gauges sales-and-marketing efficiency; the burn multiple gauges total cash burned per dollar of new ARR across the whole business.

Growth Marketing Glossary

SaaS magic number

SaaS magic numbernoun

One ratio that asks a blunt question — did last quarter's go-to-market spend pay for itself?

Schematic — SaaS magic number

Inputs: net-new ARR, prior-quarter S&M
Above ~0.75: efficient, lean in
Below ~0.5: fix efficiency first
Type: RGM analysis ratio

Forms & parts of speech

SaaS magic number · noun

Net-new ARR ÷ prior-quarter sales & marketing spend.

"A SaaS magic number of 1.1 says every go-to-market dollar bought more than a dollar of ARR."

What the ratio asks

The magic number compares the new annual recurring revenue you added this quarter to what you spent on sales and marketing the quarter before — allowing a lag for spend to convert.

It is a fast read on go-to-market efficiency. A number above roughly 0.75 suggests the engine is efficient enough to fund more spend; below about 0.5 suggests fixing conversion before pouring in budget.

Its limits

The magic number is a directional gauge, not a verdict. It ignores gross margin, churn, and the payback period, so a high number on low-margin revenue can still be a bad business.

Read it next to net revenue retention and CAC payback. Together they tell you whether the growth you are buying is efficient, durable, and recovered quickly — three different questions one ratio cannot answer alone.

Worked example. Say a company adds $3,000,000 of net-new ARR this quarter and spent $2,700,000 on sales and marketing the prior quarter. The magic number is 3,000,000 ÷ 2,700,000 = 1.1 — above one, so each go-to-market dollar bought more than a dollar of new ARR.

That signals room to invest harder, provided net revenue retention and gross margin are healthy enough to make the added ARR worth keeping.

Failure modes to watch. Treating the magic number as a complete verdict while ignoring margin and churn; computing it without the one-quarter lag between spend and revenue; and chasing a high number by underspending into a market that rewards aggression.

Formula

Magic number = Net-new ARR ÷ Prior-quarter S&M spendAbove ~0.75 efficient · below ~0.5 fix conversion first

Benchmarks

Thresholds are common rules of thumb, labelled RGM analysis. Read the magic number with margin, retention, and payback before acting on it.

> 1.0

very efficient

0.75–1.0

invest more

< 0.5

fix before scaling

Ranges are illustrative; every published figure is cited from a named public source or labelled “RGM analysis.”

Synonyms & antonyms

Synonyms

magic numbergo-to-market efficiency ratio

Antonyms

burn multiple

Usage trends

Search interest for this term over the last five years:

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Common questions

What is a good SaaS magic number?: Roughly above 0.75 is often read as efficient enough to invest more, and below 0.5 as a signal to fix conversion first — but read it with margin, churn, and payback, not alone.
How is the SaaS magic number calculated?: Divide net-new ARR in a quarter by the prior quarter's sales-and-marketing spend, allowing a lag for that spend to convert into revenue.
Magic number vs burn multiple?: The magic number gauges sales-and-marketing efficiency; the burn multiple gauges total cash burned per dollar of new ARR across the whole business.

Related tools & calculators

Resources & people to follow

referenceRGM analysis — magic number derivation
referenceBenchmarkit — B2B SaaS performance benchmarks

Curated, non-competitor resources verified per term.

Sources

trendsGoogle Trends — "saas magic number"