What is Churn?
The rate at which customers leave. High churn means holes in the bucket — plug the leaks before pouring in more customers.
Churn is the percentage of customers who stop using your service during a given period. If you had 100 customers at the start of the month and five cancelled, your churn was 5% that month. It is one of the most important health metrics for any business built on subscriptions and recurring revenue.
Think of your business as a bucket you fill from the top with water (new customers). Churn is the holes in the bottom. Pour in as much as you like — if the holes are big enough, water runs out as fast as it comes in and the bucket never fills. That is why fixing churn often beats chasing new customers.
Low churn means customers stay and are satisfied. High churn is a warning that something is wrong — the product, the price, the support or the overall experience.
Why does churn matter for your business?
Churn affects revenue, growth and how much each customer is actually worth over time. High customer loss means you have to run faster just to stand still, constantly replacing people who leave. Keeping an existing customer is also usually cheaper than winning a brand-new one.
Tracking churn helps you spot problems early. Rising churn can reveal that a competitor has taken share, pricing feels wrong or customers are not getting what they expected — often before it shows up clearly in revenue.
Churn in practice
Say you run a subscription service. One month more people than usual cancel. Instead of only trying to sell to more new customers, you investigate why they leave: ask for feedback, check where in the product they drop off, or see whether support response times have slipped.
Maybe many leave in the first month because they do not understand how the product works. Improve onboarding and more people stay — and the business grows even without a single extra new customer. Reducing churn is often the most profitable growth available.
Common questions about Churn
What does churn mean?
Churn means customer loss — the percentage of customers who stop using your service in a given period. If 5 of 100 customers cancel in a month, churn is 5%. Low churn is good; high churn is a warning sign.
How do you calculate churn?
Divide the number of customers who left during the period by the number you had at the start, then multiply by 100 for a percentage. Lost 5 of 100 customers? Churn is 5%.
What is a good churn rate?
It depends entirely on industry and business model, so there is no universal number. The rule is simple: lower is better, and churn that rises over time means you need to find out why customers are leaving.
Related terms
ARR
Annual Recurring Revenue. How much recurring money your SaaS brings in per year. Investors love this number.
CAC
Customer Acquisition Cost — what you spend to win one new customer. LTV should be at least 3× CAC. Otherwise you are buying growth at a loss.
MRR
Monthly Recurring Revenue. ARR's little sibling — the monthly version. Easier to spot short-term trends.
CRM
Customer Relationship Management — a system for tracking customers without drowning in spreadsheets. Your business memory, but better organised.
Freemium
Free basic tier plus paid premium. Works when the free version is valuable enough to use — but not enough to stop people upgrading.
LTV
Lifetime Value. How much an average customer is worth over time. Compare with CAC — otherwise you are losing money.