SaaS Magic Number Calculator (Quarterly + 12-Month Trailing)
Calculate your SaaS magic number quarterly and on a 12-month trailing (TTM) basis. Formula: (Net New ARR × 4) ÷ Prior Quarter S&M Spend. Includes gross-margin-adjusted variant. Free, private, no sign-up.
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What is SaaS magic number?
The SaaS magic number is a sales efficiency metric coined by Scale Venture Partners in 2008. It measures how much annualized recurring revenue a SaaS company generates per dollar of sales and marketing spend in the prior quarter. The formula is: Magic Number = (Net New ARR × 4) ÷ Prior Quarter S&M Spend. A magic number of 1.0 means every $1 of S&M produces $1 of annualized ARR. Above 1.0 = invest more in S&M (the channel is working). Below 0.5 = unit economics are broken.
The 12-month trailing (TTM) version sums four quarters of net new ARR and divides by four quarters of S&M spend. TTM smooths out quarterly noise and is what most VCs scrutinize at Series B and beyond. Per Bessemer State of the Cloud 2026, median public SaaS magic number is 0.65; top quartile is 1.0+.
How to interpret your magic number
Above 1.0: Sales engine is highly efficient. Press the accelerator — hire reps faster, spend more on demand gen. Companies like Atlassian, Datadog, and Snowflake historically operated here. 0.75 to 1.0: Sustainable growth zone. Keep investing at current pace and monitor unit economics. 0.5 to 0.75: Marginal — review channel mix, look for under-performing campaigns. Below 0.5: Bad. Cut S&M spend, fix the funnel, or pivot ICP before raising more. Note: enterprise SaaS often shows lower magic numbers (0.4-0.7) due to longer sales cycles, but compensates with high NRR.
Quarterly vs trailing 12-month: when to use which
Use quarterly magic number for tactical decisions: should we double Q2 marketing spend? It reflects recent channel performance. Use 12-month trailing for board reports, fundraising, and investor updates — it's the standard public-company metric and smooths seasonality. A retail-heavy SaaS might show 0.3 in Q1 (post-holiday slump) and 1.2 in Q4 (enterprise budget flush) — the TTM average of 0.7 is the true sales efficiency.
Gross-margin-adjusted magic number
The original formula ignores gross margin. For low-margin businesses (AI-native at 55-65%, marketplaces at 60-70%), this overstates efficiency. The adjusted version: (Net New ARR × Gross Margin × 4) ÷ Prior Q S&M. At 75% GM, a magic number of 1.0 becomes 0.75 adjusted. Some VCs (a16z, Bessemer) request both numbers in pitch decks. For internal decision-making, the margin-adjusted version is more honest because it reflects the cash you actually retain after delivering the service.
Sources: Scale Venture Partners original 2008 framework, Bessemer State of the Cloud 2026 (bessemer.com), OpenView SaaS Benchmarks Report 2026 (openview.com), Gartner Magic Quadrant SaaS Metrics 2026 (gartner.com). Last updated: May 2026.