SaaS Magic Number
Definition
The SaaS Magic Number measures sales efficiency by comparing new recurring revenue generated to the sales and marketing spend required to generate it. A magic number above 0.75 suggests it is efficient to increase sales spending, while below 0.5 indicates the go-to-market engine needs optimization before scaling.
Formula
Overview
The SaaS Magic Number quantifies go-to-market efficiency: for every dollar spent on sales and marketing, how many dollars of new annualized recurring revenue are generated? It is calculated by taking the quarter-over-quarter increase in recurring revenue, annualizing it, and dividing by the previous quarter's sales and marketing spend.
A magic number above 0.75 is the threshold where most VCs and operators believe it is efficient to invest aggressively in sales and marketing. Between 0.5 and 0.75 suggests cautious scaling: the efficiency is decent but there is room for optimization. Below 0.5 indicates that the sales motion is too expensive and needs fundamental improvement before scaling.
The magic number is most useful when analyzed alongside CAC payback period and LTV:CAC ratio to build a complete picture of go-to-market efficiency. A strong magic number with a long payback period might indicate that deals are large but slow to close, while a weak magic number with strong retention might suggest investing in product-led growth rather than outbound sales.
Example
Q1 ARR of $1.2M, Q2 ARR of $1.5M, Q1 S&M spend of $200K: Magic Number = ($1.5M − $1.2M) ÷ $200K × (4/4) = annualized net new ARR $300K × 4 ... Simplified: ($300K) ÷ $200K = 1.5.
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