Jake Ballinger

Jake Ballinger - FP&A Writer

January 2023 - min to read

Full steam ahead? Calculating the SaaS magic number

Full steam ahead? Calculating the SaaS magic number

How do you know when you're ready to grow your SaaS business?

(We're talking pedal-to-the-metal, full-steam-ahead growth, for the record.)

Your SaaS magic number is a good starting point.

In this guide, you'll learn how to calculate and interpret your SaaS magic number.

You'll also learn how to improve and add context to it. 

Keep reading. 

Key Takeaways

  • The SaaS Magic Number signals preparedness to spend more on sales and marketing.
  • A magic number of over 1.0 means it's time to spend more for growth.
  • A magic number between 0.75 and 1.0 means there are still some optimizations you should perform.
  • It's important to add context to your magic number with metrics like your CAC Payback Period and churn ratios. 


  1. What is the SaaS Magic Number?
  2. Calculate (and Interpret) Your SaaS Magic Number
  3. How to Improve Your Magic Number
  4. Other Factors to Consider

What is the SaaS Magic Number?

The SaaS magic number is a financial ratio that uses MRR to signal the health of a company.

How much revenue do we create for the company for every dollar we spend acquiring new customers?

The SaaS magic number tells you if you're ready for explosive growth.

Why is this important?

Knowing when it's time to pour resources into growth is obviously useful information when you're growing a SaaS business.

And knowing when to pause and reexamine your marketing and messaging is equally important.

More critically, a founder who knows her metrics has more control over her bottlenecks like:

Market Calibration: Markets change, so marketing will always require adjustments. Knowing your SaaS magic number (and seeing its trend) signals when it's time to recalibrate your marketing.

Sales Adjustments: Trends in your magic number can signal that it's time to adjust your sales methods and messaging. You can then focus on and refine those areas.

Cost Reduction: A higher SaaS magic number can signal that it's time to shift focus to optimizing your business's finances so that you see more of that revenue as profits.

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Calculate (and Interpret) Your SaaS Magic Number

Here's the formula to calculate the SaaS magic number: 

Magic Number = 4* (QR[X] – QR[X-1]) / Sales&MarketingExpenses[X-1]

Where QR[X] is the quarterly recurring revenue for a given quarter, QR[X-1] is the quarterly recurring revenue for the preceding quarter, and Sales&MarketingExpenses[X-1] is the sum total of sales and marketing expenses from that same preceding quarter. 

Let's look at an example: 

Company A QR Sales & Marketing Expenses
Q1 $2M $1.6M
Q2 $2.4M $1.8M
Q3 $3 -

So our magic number for the end of Q2 is (4 * ($2.4M - $2M)) / $1.6M = 1. 

And our magic number for the end of Q3 is (4 * ($3M - $2.4M)) / $1.8M) =  1.33. 

But what does this mean? 

How to Interpret Your SaaS Magic Number

Fortunately, the SaaS magic number is pretty clear-cut. 

Here are some SaaS magic number benchmarks:

≤ 0.75: 🛑 You're definitely not ready to put more money into growth. Focus on optimizing your existing spend.

≥ 0.75 but ≤ 1.0: ⚠️ You're probably ready for growth, but there are still a few things to optimize.

≥ 1.0: ✅ Time to increase your sales & marketing spend and grow!

When raising capital, most firms want to see a SaaS magic number at or above 0.75. 

How to Improve Your SaaS Magic Number

Since the SaaS magic number is a simple metric, ways to improve it are also pretty simple. 

Either earn more revenue or optimize your sales and marketing spend. 

Or, ideally, do both. 

Here are some ideas to get you started: 

Sell to Existing Customers with Expansions

The cheapest customer to acquire is the customer you already have. 

And some of those customers could actually get more value from an upsell or a cross-sell. 

These kinds of expansions will boost your MRR, which directly boosts your SaaS magic number. 

Shorten Your Sales Cycle

Sales efficiency is incredibly important for growing SaaS businesses. But longer sales cycles are also more expensive.

A long sales cycle can also mean it takes longer to recoup your sales and marketing investment per new logo, which puts realistic limiters on how quickly you can grow.

That said, shortening your sales cycle can lead to higher churn and can mean you sell to more unqualified leads, so it's important to always be testing and refining your sales cycle. 

Invest in Low-Cost, High-Yield Marketing Options

When it comes to marketing, the best ROI comes from content marketing. 

Investing in content marketing and SEO, as well as cultivating a healthy relationship with your email list, is a proven way to get a steady, high volume of qualified leads.

Good content is evergreen, which means that investing in content marketing means investing in assets that will continue to pay dividends for years to come. 

Slash Underperforming Paid Channels

If you're running paid advertisements, it's likely that some ads and platforms are performing better than others. 

If that's the case, think about simplifying and consolidating your ads. Repeat what works and spend less on what works not as well.

In other words, you should work on optimizing your ad spend

All this said, simply increasing your SaaS magic number for the sake of increasing it isn't the silver bullet to unicorn status. 

You need other metrics to give your magic number context—and to be clear with your cash flow.

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Other Factors to Consider

Like any metric, the SaaS magic number has its limitations.

It's still a super valuable metric. But it's not going to tell you the full picture on its own.

For example, you also have to consider your runway, your customer acquisition cost payback periods, and your overall cash flow. 

Expansions or Acquisitions?

Since the magic number uses Monthly Recurring Revenue, you don't know if that revenue is due to expansions or to new logos.

If the bulk of your revenue comes from expansions, then your strength in acquiring new customers is questionable.

Likewise, if most of your MRR comes from new bookings, there might be concerns over the strength of your NRR and your ability to retain customers and revenue.

CAC Payback Period

CAC (Customer Acquisition Cost) Payback Period is the length of time it takes to recoup the cost of acquiring a customer. 

In other words, because there's a lag between when a company spends on sales and marketing and when a company acquires new customers, understanding the CAC payback period is essential to knowing how much you can allocate to sales and marketing.

Gross Margins

Similar to your CAC Payback Period, the gross margin on each product (or subscription) you sell affects your overall profits and the money you have to reinvest in the business. 

The gross margin is what remains after subtracting COGS (cost of goods sold) from net sales revenue. 

When you understand your payback period and your gross margins, you can discern the true cost of acquiring a new customer. 

In other words: this is a metric that anchors your reality. The SaaS magic number is merely a flag---red, yellow, or green. But your gross margins are a huge factor in determining how quickly you actually can grow. 

Bessemer CAC Ratio

The Bessemer CAC Ratio focuses on the efficiency of acquiring new customers. 

In other words, your Bessemer CAC Ratio will tell you how quickly your gross margin pays for your new customers.

This is important context because the SaaS magic number doesn't account for the expense of running a business.

If your ratio is over 1.0, it means you have room to keep investing in sales and marketing. But if it's less than 1, you need to continue to monitor your spending.

(1.0 is sometimes called a Bessemer magic number.) 

Here's how to calculate the Bessemer CAC Ratio: 

(Gross Margin * New Annual Contract Value[x]) / CAC[x-1] 


The SaaS magic number doesn't account for churn, so if you're not keeping customers (or if you have high revenue churn) then your magic number is painting a rosier picture than reality.

So it's always a good idea to provide context here.

Additionally, if your churn rates are too high, you're essentially not getting your customer acquisition costs to level out. 

Keeping churn low is a top priority for businesses poised for high growth. 

Now It's Your Turn

Now you know how to calculate and interpret your SaaS magic number. 

You also learn how to improve it and what other context you should give it. 

Now I want to turn it over to you: which strategy in this article are you going to try first?

Are you going to go all-in with upsells? Or are you going to invest in content marketing? Maybe you're ready to begin pouring money into sales and marketing as is. 

Either way, share this on LinkedIn and tag us to keep the conversation going.

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