What is the Magic Number for SaaS?

Full Explanation

Magic Number = (Current Quarter Revenue − Previous Quarter Revenue) / (Prior Quarter S&M Spend). For example, if Q1 revenue was £500K and Q2 was £550K (£50K growth), and Q1 S&M spend was £100K, Magic Number = £50K / £100K = 0.5. This means every pound of marketing spend generated £0.50 in incremental quarterly revenue. A Magic Number above 0.75 is strong; above 1.0 is exceptional; below 0.5 suggests inefficient marketing. The Magic Number helps answer the question: if we increase marketing spend, what return do we get? High Magic Numbers indicate the company can sustainably increase spend to accelerate growth. Low Magic Numbers suggest marketing saturation, poor targeting, or weak product-market fit in the target segment. Magic Number varies dramatically by business model: land-and-expand SaaS might target 1.0+, because each pound spent returns recurring value over customer lifetime; transactional business might target 0.5 because revenue is one-time. The metric is useful for growth diagnostics — declining Magic Number signals market saturation or campaign efficiency collapse.

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