A magic number of 2.0 means every dollar of sales and marketing spend returned $2.00 of new annual recurring revenue. Above 1 is efficient enough to invest more aggressively.
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The SaaS magic number tells you how efficiently your sales and marketing spend turns into recurring revenue. It is one of the cleanest signals of whether your growth engine is ready to scale or needs fixing first. The calculator above runs the standard formula instantly from one quarter of your own numbers.
The magic number is a sales efficiency ratio. It measures how much new annual recurring revenue each dollar of sales and marketing spend produced. The formula is: annualized net new revenue divided by the previous quarter's sales and marketing spend. To get annualized net new revenue, you take the recurring revenue you added in the quarter and multiply it by four, because that new revenue keeps recurring all year. A magic number of 1 means every dollar you spent on growth returned a dollar of new annual recurring revenue. Investors and operators lean on it because it cuts through vanity metrics and shows whether a business can buy growth profitably.
Start with your recurring revenue from the current quarter and subtract the previous quarter's recurring revenue. Say you went from $440,000 to $500,000 in quarterly recurring revenue. That is $60,000 in net new revenue. Multiply by four to annualize it: $240,000. Now divide by what you spent on sales and marketing the previous quarter. If that spend was $120,000, your magic number is $240,000 divided by $120,000, which equals 2.0. You use the previous quarter's spend, not the current one, because there is a lag between when you spend and when the revenue shows up. That single number tells you the deal: this business returned two dollars of new annual recurring revenue for every dollar it spent acquiring it.
The thresholds are well established. Below 0.75 is a warning sign. It means payback on your growth spend is slow, and pouring more money in will only burn cash faster. Fix your funnel, pricing or retention before you scale. Between 0.75 and 1 is solid and sustainable. Your go-to-market works, and you can keep spending at the current pace with confidence. Above 1 is the green light. Your acquisition is efficient enough that holding back spend is leaving growth on the table, so this is the moment to invest more aggressively and capture the market. One caveat: the magic number ignores gross margin and churn, so pair it with payback period and net revenue retention before you bet the budget. For a growth plan that lowers acquisition cost and lifts this number with organic demand, request a free SEO audit and we will model it on your real numbers.
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