SaaS Magic Number Calculator

The SaaS magic number calculator measures how efficiently your business turns sales and marketing spend into new recurring revenue. It divides the net new annual recurring revenue you added in a quarter by the sales and marketing spend from the prior quarter, which reflects the lag between when you spend and when that effort closes deals. You enter two inputs: the net new ARR generated in the quarter and the prior-quarter sales and marketing spend, both in dollars. The result is the magic number, a single ratio, along with a plain-language read of what it means. Founders, finance leaders, board members and investors use it to judge go-to-market efficiency and to decide whether it is safe to pour more money into growth. The common reading is straightforward: a magic number of 1.0 or above signals strong, efficient growth where every dollar of spend brings back more than a dollar of new ARR within roughly a year, so leaning in usually pays off. Between 0.75 and 1.0 is healthy and worth scaling carefully, while below 0.75 suggests your sales motion needs tuning before you add more spend. A few tips keep the figure honest. First, use net new ARR, after subtracting churn and contraction, not gross new bookings, so the number reflects real growth. Second, multiply quarterly net new ARR by four if your inputs are quarterly, to annualise it consistently. Third, read the magic number alongside payback period, gross margin and retention, because no single metric tells the whole story of efficient growth.

Magic number = net new ARR in quarter / prior-quarter S&M spend. Estimate only, not financial advice.