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finance.business-magic-number Calculator
Calculates the SaaS Magic Number in a business finance context from net new ARR and sales & marketing spend. Magic Number above 0.75 indicates efficient go-to-market — below 0.5 signals the growth engine needs rebuilding before additional investment.
Inputs
New Arr
Reference formula or conversion factor shown for context.
Prev S M
Reference formula or conversion factor shown for context.
Curr S M
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
Results
magic number
Sample size or count used in the calculation.
sales efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
payback (months)
The result expressed in months. Divide by 12 to convert to years.
CAC recovery
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.