What is the magic number and should I care about it at my stage?
The short answer
The magic number is how many dollars of annualised new revenue you generated for each dollar of sales and marketing you spent in the previous period. It was coined at Scale Venture Partners in 2005 when Rory O'Driscoll saw Omniture producing more than two dollars of first year revenue per dollar of go to market spend and said it was magic. The long run median for SaaS sits around 0.7, roughly one is good, and above one is usually a signal to spend more. Should you care yet? Not much below a million dollars ARR, because the numbers are too small and lumpy for the ratio to mean anything. Track it once you have a repeatable motion and a few quarters of comparable spend.
Go deeper, your way
3 hand-picked resources, 3 link-checked. Pick how you want to dig in.
📄 Article
✓ Link checkedFreeIntermediate
Why we picked it
The magic number was invented at Scale, so this is the primary source, including the Omniture story behind the name and how the benchmark has drifted since 2005.
Why we picked it
Separates gross sales efficiency, net sales efficiency and magic number, which most people use interchangeably and should not. Also sets the 0.7 long run median you will be judged against.
Why we picked it
The formula reference: CAC, months to recover CAC, magic number, net MRR churn and NRR, each with the calculation spelled out. Bookmark it and stop arguing about arithmetic.