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SaaS Magic Number: How to Calculate This Sales Efficiency Metric

Joseph Garafalo
Joseph Garafalo
Posted on
October 19, 2020
Updated on
September 26, 2021
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The SaaS magic number is a sales efficiency metric that answers a basic question—for every dollar we spend on sales and marketing, how much revenue do we create for the company? Learn how you can calculate your magic number and identify opportunities to your improve growth efficiency.

The SaaS magic number is a common sales efficiency metric for software subscription businesses. 

At the most basic level, the metric asks: "For every dollar spent on acquiring new customers with sales and marketing , how many dollars' worth of revenue do we create for the company?" Answering that question starts with knowing the magic number formula.

How Do You Calculate the SaaS Magic Number?

You can calculate the magic number for your SaaS business by subtracting current quarter annual recurring revenue (ARR) from prior quarter ARR and dividing by your customer acquisition cost (CAC) from the previous quarter.

saas magic number equals prior quarter ARR minus current quarter ARR divided by prior quarter CAC
SaaS Magic Number Formula: (Prior Quarter ARR - Current Quarter ARR) / Prior Quarter CAC


The primary SaaS magic number equation uses quarterly revenue numbers for the calculation. But you can use monthly recurring revenue (MRR) to come up with magic number on a monthly basis or calculate on an annual basis depending on your normal sales cycle.

Regardless of the approach you take, the calculation gives you a high-level understanding of sales efficiency. The calculation combines new ARR/MRR and renewal revenue to provide a more holistic understanding of business growth rate. But if you need to get more granular with renewal and upgrade performance, you can couple your magic number calculation with other financial metrics like net revenue retention.

Why Does the Magic Number Matter?

Your magic number matters because it can help you understand how efficient your sales and marketing engines are in a specific time period, and can tell you when to invest more or less in those engines.

The easiest example is a magic number of 1. If your magic number is 1, that means you'll pay back the quarter’s worth of sales and marketing spend (the denominator of the SaaS magic number equation) from the incremental revenue generated over the next year (the numerator). You can look at that efficiency metric in the context of your business and decide whether or not to increase S&M spend. But if you're looking for typical benchmarks, there are 3 thresholds to consider, shown in the image below.

saas magic number benchmarks for efficiency
SaaS magic number benchmarks


When analyzing your magic number, consider what each of these SaaS magic number benchmarks tells you about your sales efficiency:

  • Magic Number Less than 0.5: A magic number this low typically indicates that something is wrong with your business model. Your total SaaS cost of service might be too high. Your SaaS product might not resonate with target customers. Maybe your churn rate is unusually high because of a lack of product maturity, causing a dip in ARR. Or, maybe you're investing so much in acquiring new customers without a pricing model that's able to make up for the spend. When you have a magic number less than 0.5, you likely have to continue working on your product-market fit.
  • Magic Number Less than 0.75: This is the main threshold to consider for magic number. If you're approaching the 0.75 mark, you're on the right track with sales efficiency. However, whether or not you should increase marketing investment or add to your sales team at this level depends on the context of your business. Look at your runway, free cash flow, and gross margins to determine whether or not more growth investments make sense.
  • Magic Number Greater than 0.75: A magic number over 0.75 should give you a green light to build out the sales and marketing functions. You reach this level when you've proven product-market fit and acceptable CAC payback periods. At this stage, you likely have an efficient monthly payback number, which means you can withstand increased marketing expenses in things like content marketing, digital advertising, and SEO. While a magic number of 1.0 may be more ideal, you should feel comfortable after exceeding the 0.75 benchmark.

When investor Lars Leckie popularized the magic number as a sales efficiency metric in 2008, he said: 

"Fundamentally, the key insight is that if you are below 0.75 then step back and look at your business, if you are above 0.75 then start pouring on the gas for growth because your business is primed to leverage spend into growth. If you are anywhere above 1.5 call me immediately." 


No SaaS financial metrics are perfect on their own, and magic number is no exception. But these are still effective benchmarks to keep track of.

The magic number is a widely used formula for SaaS companies at all different stages. However, it’s especially valuable for telling the story of sales and marketing efficiency behind strong revenue growth in early stage startups. Having this kind of context can make or break your pitch for a new round of venture capital.

But if your magic number is not where you want it to be, don't worry. There are plenty of ways to improve this metric. Try optimizing your ad spend, or refining your customer persona so you're targeting the right buyer. You can purchase sales automation tools that increase your outreach and automate follow ups to help reduce sales and marketing costs as well.

A Better Way to Track Your Magic Number

Historically, tracking your magic number took manual effort, and as soon as you pulled financial data down into Excel and calculated it, it was already stale. With Mosaic, you get a SaaS magic number calculator that enables you to track your magic number in real time, which means you can know exactly when to dial up your marketing spend to reach more people or when to reduce spend for safety.

Seeing your magic number is helpful, but even more powerful is the ability to quickly swap out different components of the calculation to get a different view of your company’s financial health.

For example, you may want to look at your Bessemer CAC ratio as a comparison to magic number. This efficiency metric focuses only on new customer acquisition and gross margins in relation to CAC. It’s closely related to the magic number and gives you another benchmark for evaluating your ability to sustain more marketing expenses. Similarly, you could add a CAC payback period chart in Mosaic to view that metric side-by-side with magic number. The more context you can get, the better.

Why Your SaaS Business Needs More Than a Magic Number

Much of the work of sales and marketing teams can seem like pure magic. The way your sales team satisfies its quarterly quotas just in time to meet your bookings goal seems like some sort of sorcery. And the uncanny ability of marketing functions to serve up the perfect ad at the perfect time—that’s straight-up ESP.

Luckily, the finance team doesn’t have to understand how marketing is always able to offer customers a perfectly timed, personalized solution or how sales always finds new ways to close deals. But you do need to do a little magic of your own: You need to be able to measure how efficiently sales and marketing are helping the business grow—and to do it, you need to know your magic number.

But the magic number isn’t actually all that magical. It’s a useful snippet, but looking at individual SaaS KPIs will never tell the full story of your business. You need to be able to see a complete picture of the company’s performance, in one place, in real time, at any time. And that means keeping a finger on the pulse of every SaaS metric that matters to your business.

Mosaic plugs into all of your financial-data-generating tools, normalizes that data, and automatically calculates all kinds of useful metrics. It gives you insight into metrics like the SaaS rule of 40, CAC, lifetime value (LTV), average revenue per customer (ARPU), and cost of goods sold (COGS) or cost of revenue. You can easily experiment with different inputs, tweak your calculations to better map to your business’ KPIs, and share your findings cross-functionally with clean, clear representations. No manual data pulls, no error-prone calculations, no dizzying dashboards, just a holistic view of your business’ efficiencies and financial outlook. (That’s magic.)

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