Churn rate

What is churn rate?

Churn rate is the metric that tells you how fast your customer base leaks. Every business loses customers; churn rate turns that loss into a percentage you can track month over month, compare against your growth, and act on. If you start a month with 200 customers and 10 of them cancel, you churned 5 percent that month.

The concept comes from subscription businesses, where the whole model depends on customers sticking around long enough to repay what it cost to acquire them. But any product with repeat usage has churn, whether or not money changes hands: an app where users stop opening it, a newsletter people stop reading. Day to day, churn rate is the number that tells you whether the bucket you are filling with new signups has a hole in the bottom, and how big that hole is.

There are two flavors worth separating. Customer churn (or logo churn) counts people who leave. Revenue churn counts dollars that leave, which matters when customers pay different amounts: losing one $500 account can outweigh keeping ten $10 ones.

How to calculate churn rate

The basic formula: Churn rate = (customers lost during the period / customers at the start of the period) x 100.

Say your SaaS starts March with 400 paying customers. During March, 22 cancel and 60 new customers join. Your March customer churn is 22 / 400 = 5.5%. Note that the 60 new signups do not enter the calculation: churn measures losses against the starting base, so growth cannot mask it. For revenue churn, do the same with dollars: if those 22 customers represented $900 of your $14,000 starting MRR, revenue churn was about 6.4 percent.

Why churn rate matters for startups

Churn sets the ceiling on your growth and the floor on your economics. At 5 percent monthly churn, the average customer stays about 20 months; at 10 percent, about 10 months. That single difference doubles or halves your customer lifetime value, which decides how much you can afford to spend on acquisition. For a small team, churn rate is also the most honest product signal you have: marketing can inflate signups, but only a product people genuinely need keeps churn low. Many founders treat rising churn as a louder alarm than slowing signups, and they are right to.

Churn rate in practice

Imagine you run a $19 per month writing tool. Signups grow 8 percent monthly and you feel great, but churn sits at 11 percent. You do the math: at that rate, growth stalls near 700 customers, because monthly cancellations will equal monthly signups. That realization changes your roadmap. You pause a new feature, spend six weeks on onboarding and engagement, and get churn to 6 percent. Same signup rate, but your stall point more than doubles and every cohort is now worth almost twice as much.

Benchmarks and rules of thumb

Churn varies enormously by market, price point, and customer size, so treat any benchmark with suspicion. That said: many early-stage products selling to consumers or very small businesses see monthly churn in the 3 to 8 percent range, while mature SaaS selling to larger companies often runs below 1 to 2 percent monthly. Annual contracts naturally show lower monthly churn than month-to-month billing. The useful discipline is less about hitting a universal number and more about making your own churn trend steadily down as the product matures.

Common mistakes

• Letting growth hide churn. Net customer count can rise while churn quietly worsens. Always track churn separately from net growth.
• Measuring only customer churn. If your biggest accounts are the ones leaving, logo churn understates the damage. Watch revenue churn too.
• Averaging across cohorts. New customers churn faster than old ones. A blended rate can look stable while your newest cohorts collapse. Look at cohort curves.
• Counting involuntary churn as rejection. Failed payments are a fixable billing problem, not a verdict on your product. Separate them before drawing conclusions.

Related concepts

Churn rate is one lens on the same phenomenon as retention rate, its mirror image. When the number looks bad, customer churn analysis is how you find out why, and churn mitigation is the playbook for fixing it.