The 4 SaaS Metrics Every Founder Must Track: MRR, ARR, CAC, and Churn

When it comes to SaaS businesses, success is undeniably a numbers game. SaaS business success depends on tracking metrics that clearly show your current position and growth trajectory, and this article will walk you through the essential SaaS metrics: MRR, ARR, CAC, and churn rate—key numbers every founder needs to grow their business and impress investors.

Scenario:

You’re a SaaS founder. It’s Monday morning, and an investor call is looming. They’re going to ask for updates on your business performance. Your deck has graphs and projections, but do you know what your spreadsheets mean? Are you prepared to explain your Monthly Recurring Revenue (MRR) and why last month’s churn rate spiked?

Here’s the good news: these metrics are straightforward to calculate. If you’re pressed for time or your financials are in disarray, Cypher can handle the heavy lifting. For now, let’s break down how to calculate them together.

Key SaaS Metrics Every Founder Should Track

1. Monthly Recurring Revenue (MRR)

MRR is the heartbeat of your SaaS business. It measures the predictable revenue you earn each month from active subscriptions.

For insights into managing cash flow effectively and its impact on revenue, check out Cash Flow Strategies for SaaS Startups: A Tale of Two Companies.

Why It Matters:

  • Consistency: Investors love predictability.
  • Trend Tracking: It helps identify growth patterns.

Founder Insight:

Jason Lemkin, founder of SaaStr, emphasizes, “MRR growth is your ultimate growth engine. If your MRR isn’t growing consistently, you need to find out why—fast.”

How to Calculate It:

  • Formula: MRR = Total Active Subscribers × Average Revenue Per User (ARPU)
 

Subscriber Tier

Subscriber Count

ARPU ($)

MRR ($)

Basic

500

20

10,000

Pro

200

50

10,000

Enterprise

50

200

10,000

Total

  

30,000

2. Annual Recurring Revenue (ARR)

ARR is the bigger, long-term picture. It’s simply your MRR multiplied by 12.

Why It Matters:

  • Future Planning: ARR helps forecast revenue and budget planning.
  • Valuation: It’s a key metric for potential buyers or investors.

Investor Insight:

According to Christoph Janz of Point Nine Capital, “ARR is the foundation for long-term planning. But don’t let it distract you from the monthly details.”

How to Calculate It:

  • Formula: ARR = MRR × 12
 

MRR ($)

ARR ($)

30,000

360,000

3. Customer Acquisition Cost (CAC)

Your CAC tells you how much you’re spending to acquire a new customer. It’s vital to keep this cost in check to ensure your growth is sustainable.

How to Calculate It:

  • Formula: CAC = (Total Marketing + Sales Expenses) ÷ Number of New Customers
 

Expense Type

Amount Spent ($)

New Customers Acquired

Digital Ads

5,000

50

Sales Team Salaries

10,000

 

Other Campaigns

2,000

 

Total

17,000

50

CAC: $340

Why It Matters:

  • Profitability: High CAC can kill your profitability.
  • Optimization: Tracking CAC helps you fine-tune your acquisition strategies.

4. Churn Rate

The churn rate measures how many customers leave your service in a given period.

Understanding churn and revenue recognition is crucial for subscription-based businesses. Learn more in From Deferred to Earned: Making Sense of SaaS Revenue Recognition for Subscription-based SaaS Businesses.

Why It Matters:

  • Retention: Even the best acquisition strategies can’t make up for poor retention.
  • Health Check: High churn is a red flag.

Executive Insight:

“Retention is the new growth,” says Alex Schultz, CMO of Meta. “Focus on keeping your customers happy, and you’ll naturally grow.”

How to Calculate It:

Formula: Churn Rate = (Lost Customers ÷ Total Customers at Start of Period) × 100

 

Period

Total Customers

Lost Customers

Churn Rate (%)

Q1

1,000

50

5.00

Q2

950

70

7.37

Beyond the Basics

Once you’ve mastered the foundational metrics, go deeper:

  • Net Revenue Retention (NRR): Measures revenue growth from existing customers, accounting for upgrades, downgrades, and churn.
  • Lifetime Value (LTV): The total revenue a customer will generate during their time with you.
  • Burn Rate: How quickly you’re spending your cash reserves.

Bringing It All Together

Metrics tell a story and give you the insights to make smarter decisions, attract investors, and scale your SaaS business with confidence.

And you don’t have to do it alone. At Cypher, we specialize in automating and optimizing financial tracking for SaaS founders. Whether it’s forecasting MRR or understanding your CAC, we’re here to make sense of your numbers.

Build your empire—we’ll crunch the numbers. — Courtesy of Cypher

Ready to take control of your metrics? Get in touch.

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