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SaaS Magic Number Calculator

The cleanest signal of when sales is efficient enough to scale. Magic number = annualized net new ARR ÷ S&M spend.
Magic number
2.86
Annualized new ARR
$1.0M
S&M spend
$350K
VerdictExcellent. Each dollar of S&M is producing >$1.50 of new annualized revenue. Press the gas.
Benchmarks
  • ≥ 1.5Excellent — scale
  • 1.0–1.5Healthy
  • 0.75–1.0Workable
  • < 0.75Inefficient

What is the saas magic number calculator?

Magic Number = (Quarterly net new ARR × 4) ÷ Prior-quarter S&M spend.

It tells you how many dollars of annualized new revenue each dollar of sales-and-marketing spend produces. A magic number of 1.5 means $1 of S&M spend generated $1.50 of annualized new ARR.

Why this matters for founders & operators

Magic number is the single best decision rule for "should I scale sales spend?" in modern SaaS:

  • ≥ 1.5: Scale aggressively. Every additional dollar of S&M produces excellent return.
  • 1.0–1.5: Scale steadily. Healthy, but watch payback period.
  • 0.75–1.0: Hold steady. Improve before scaling.
  • < 0.75: Cut S&M. The motion isn't working at this spend level.

It pairs naturally with our burn multiple calculator and CAC/LTV calculator.

How to use this calculator

  1. 1
    Use last full quarter's net new ARR

    (New + expansion ARR) − (churn + contraction ARR). Annualized by × 4 in the formula.

  2. 2
    Use prior quarter's S&M spend

    Spending creates ARR with a lag. Match the lag to the conversion timing in your funnel.

  3. 3
    Include all S&M costs

    Sales salaries + commissions + marketing salaries + ad spend + sales tools + events. Fully loaded.

  4. 4
    Trend over multiple quarters

    One quarter is noisy. Three or four quarters of consistent magic number is the signal.

FAQ

Why annualize new ARR by × 4?+
Magic number compares annualized return to a quarterly investment. Multiplying ARR by 4 gives you the annual run-rate of revenue produced per quarter of spend.
Should I include customer success in S&M?+
Generally no — CS is COGS or G&A depending on how you organize. Magic number isolates customer acquisition efficiency, not retention.
How does magic number relate to CAC payback?+
Inversely. A magic number of 2 implies ~6 months CAC payback. A magic number of 0.5 implies ~24+ months payback.
Should I use this at very early stage?+
Less useful below $500K ARR — quarterly numbers are too small and noisy. Useful from ~$2M ARR upwards.