Glossary term
Sales Efficiency
Revenue generated per dollar of sales and marketing spend; an alternative framing of the Magic Number.
Sales Efficiency measures the revenue a company generates per dollar of sales and marketing spend. It is an alternative framing of the Magic Number, which divides net new annual recurring revenue by the prior period's sales and marketing cost. Both answer the same question: does the go-to-market engine produce growth profitably, or is it buying revenue at a loss?
It matters most as a trend across scale. Early on, a company tends to capture its cheapest, easiest customers and post strong efficiency. As that market is exhausted, each incremental customer costs more to win, so a falling ratio signals that growth is getting more expensive rather than more durable.
Closelooknet reads declining sales efficiency as one of the earlier structural warnings in the SaaSpocalypse thesis, because it tends to deteriorate before headline growth does. It is read together with CAC and net revenue retention rather than on its own.
In practice, $40m of sales and marketing spend that produces $30m of net new ARR gives a magic number of 0.75, around the level below which many software businesses are judged to be spending inefficiently to grow.