SaaS Metrics That Actually Matter

Pageviews, Twitter followers, Product Hunt upvotes. None of these pay your rent. If you are building a SaaS, there are exactly four numbers you need to watch. Everything else is a distraction until you are past six figures in annual revenue.

MRR: The Only Revenue Number

Monthly Recurring Revenue is your heartbeat. Not total revenue. Not one-time payments. Recurring money that shows up every month. Track it weekly at minimum. Break it into new MRR from new customers, expansion MRR from upgrades, and churned MRR from cancellations. When you see churned MRR growing faster than new MRR, you have a problem. When expansion MRR exceeds churned MRR, you have negative churn and that is the holy grail. A simple spreadsheet works fine for tracking this until you hit 50 customers.

Churn: The Silent Killer

Monthly churn above 5 percent will kill most SaaS businesses slowly. You just will not feel it dying until it is too late. Calculate it simply. Customers lost this month divided by customers at the start of the month. If you started with 100 and lost 8, that is 8 percent churn. At that rate, you need to add 8 new customers every month just to stay flat. That is exhausting. The fix is not more marketing. It is talking to the people who cancelled. Send a short email asking why. You will find patterns. Maybe onboarding is confusing. Maybe a key feature is missing. Maybe your pricing is wrong. Fix the bucket before you pour more water in.

CAC and LTV: The Ratio That Matters

Customer Acquisition Cost is what you spend to get one paying customer. Add up your marketing spend, tool costs, and time value for a month. Divide by new customers acquired. If you spent $500 on ads and got 10 customers, your CAC is $50. Lifetime Value is how much a customer pays you before they leave. If they pay $30 a month and stick around for 10 months on average, LTV is $300. The rule of thumb is LTV should be at least 3x your CAC. If your LTV is $300 and your CAC is $50, you are in great shape. If your CAC is $200, you are burning money. Early on, your best CAC channels are content marketing, cold outreach, and communities. All nearly free except for your time.

Skip Everything Else for Now

You do not need a metrics dashboard with 30 charts. You do not need to track Net Promoter Score when you have 12 customers. You do not need cohort analysis before you have cohorts worth analyzing. Track MRR in a spreadsheet. Check churn monthly. Estimate your CAC and LTV quarterly. That is it. As you grow past $5K MRR, add more granularity. But in the early days, these four numbers plus direct conversations with customers tell you everything you need to know about whether your business is working.

Quick Takeaway

Focus on four metrics: MRR for growth, churn for retention, CAC for acquisition efficiency, and LTV for long-term health. Aim for LTV to be 3x CAC and churn under 5 percent. Skip vanity metrics until you have real revenue to optimize.