SaaS

SaaS Magic Number Calculator

Estimate sales efficiency by comparing annualized new recurring revenue produced this quarter against the prior quarter's sales and marketing spend.

Last reviewed: April 30, 2026Free toolMethodology

SaaS Magic Number Calculator

These fields start with sample inputs. Keep them or replace them, then run the tool to show a fresh result.

Number fields accept plain values and common formatted input such as 250000, 250,000, or 1,234.56.

Result

Calculating the sample result.

Why it matters

The magic number is widely used in SaaS because it ties go-to-market spend to recurring revenue output in a capital-efficiency-friendly way.

When to use

  • Checking sales efficiency quarter over quarter
  • Comparing growth against go-to-market investment
  • Adding context to payback and burn discussions

Inputs & Outputs

Inputs

  • Current quarter MRR and previous quarter MRR show how much recurring revenue was added during the quarter.
  • Previous quarter sales and marketing spend is the cost base commonly paired with that revenue change.

Outputs

  • Magic number shows annualized net new ARR divided by prior-quarter sales and marketing spend.
  • Net new ARR shows the recurring revenue increase translated into an annual run-rate.

Magic number formula

Subtract previous quarter MRR from current quarter MRR, annualize the difference by multiplying by 4, then divide by the prior quarter's sales and marketing spend.

Magic number = ((current MRR - previous MRR) x 4) / prior quarter S&M spend

Worked example

1

Quarterly efficiency view

MRR rose from 900,000 to 1,040,000 while prior-quarter sales and marketing spend was 500,000.

Inputs

  • Current MRR: 1,040,000
  • Previous MRR: 900,000
  • Prior-quarter S&M spend: 500,000

Steps

  • Net new ARR = (1,040,000 - 900,000) x 4 = 560,000
  • Magic number = 560,000 / 500,000 = 1.12

Result

  • The SaaS magic number is 1.12.

Edge cases & caveats

  • The metric can be noisy for small companies with quarter-to-quarter lumpiness.
  • It assumes prior-quarter spend is the right cost base for current-quarter revenue change.

Frequently Asked Questions

Why multiply the MRR change by 4?

Because the metric annualizes the quarterly recurring revenue increase into an ARR equivalent.

Can the magic number be negative?

Yes. If MRR shrinks quarter over quarter, the annualized result becomes negative and the magic number will too.

Keep going

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