Magic number
Classic `(Net new ARR × 4) ÷ prior S&M` lens—`max(spend, 1)` prevents blow-ups when comparing to partial-quarter exports.
Example scenario
RevOps closes fiscal Q2 with $620,000 in net new ARR booked after netting gross-new logos plus expansion minus contraction churn within the net-new definition finance approved for GTM reporting. Prior-quarter sales and marketing cash spend loaded from the GL totals $980,000 inclusive of demand-gen programs and quota-carrying AE payroll mapped to S&M. Annualizing net new ARR (×4) implies $2.48 million relative to that spend, yielding a magic number near 2.53× under these defaults before seasonal adjustments.
Magic number
(Net new ARR × 4) ÷ prior quarter S&M spend
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How to use the magic number
- Input net new ARR this quarter ($) using the same definition as board reporting—usually gross-new plus expansion minus downgrade churn unless finance excludes expansion by policy.
- Input prior-quarter sales and marketing spend ($) from GAAP-loaded S&M inclusive of commissions, events, tools, and demand-gen headcount mapped to the GTM org.
- Read magic number and annualized net new ARR; compare against trailing three-quarter averages when one quarter distorts seasonality.
- Cross-check spend timing so ARR creation aligns with the marketing investment that seeded those opportunities rather than mixing mismatched fiscal weeks.
Magic number interpretation bands
- Common venture heuristic thresholds
- SaaS operators often cite magic numbers below roughly 0.5 as inefficient scaling, roughly 0.5–0.75 as mixed signals needing cohort review, and above roughly 0.75 as stronger efficiency where incremental GTM investment merits serious consideration.
- Annualization assumption
- Multiplying quarterly net new ARR by four assumes steady bookings cadence; highly seasonal closes distort the ratio unless you smooth multiple quarters.
- Spend timing lag
- Pairing current-quarter creation with prior-quarter spend reflects typical pipeline lag, but enterprise cycles may require longer distributed models.
Best use cases
- Forecasting and scenario planning
- Client education and pre-qualification
- Budget and performance decision support
Frequently asked questions
Should net new ARR include expansion revenue from existing accounts?
Follow your internal definition consistently; many firms include seat expansion in net new ARR while reporting gross churn separately, but PLG metrics sometimes isolate new-logo ARR only.
Why annualize with ×4 instead of using trailing-twelve-month ARR?
The classic shortcut linearizes quarterly cadence for fast feedback; TTM ARR smooths volatility but slows reaction time when spend just shifted.
Do stock-based compensation expenses belong in S&M spend?
Include them if your benchmark peers do and your finance team wants GAAP comparability; cash-planning teams sometimes back out SBC for burn-based decisions.
Can magic number exceed one while growth still slows?
Yes—cutting spend lifts the ratio mechanically while starving pipeline; interpret alongside pipeline coverage, win rates, and leading indicators.
Glossary
Scenario modeling
Testing multiple assumptions to estimate possible outcomes before execution.
Commercial intent
User behavior indicating readiness to buy, subscribe, or request a quote.
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Category: SaaS sales efficiency metricsTopics: Magic number, Sales and marketing efficiency, Net new ARR
Last reviewed: 2026-05-07
Reviewed by: Calclet Growth Team