Churn Rate

What Churn Rate means in practice

Churn is the most consequential number in a subscription business because it silently sets a ceiling on how large you can become. At 5% monthly churn you lose roughly half your customers each year, so growth requires replacing that half before adding anyone new. The higher the churn, the more of your acquisition effort is spent standing still.

Customer churn and revenue churn tell different stories and both are worth tracking. Losing many small accounts hurts customer churn while barely moving revenue; losing one large account does the reverse. Net revenue churn also accounts for expansion within existing accounts, which is why strong businesses can have negative net churn — growing revenue without adding a single customer.

Benchmarks vary sharply by segment. SMB SaaS commonly runs 3–7% monthly because small businesses fail and switch often. Enterprise SaaS typically sits under 1% monthly, since contracts are annual and switching is disruptive. Comparing your churn against the wrong segment produces false comfort or false alarm.

How it is calculated

Worked example

A SaaS business starting the month with 500 customers.

• Customers at start of month: 500. Customers lost: 25.
• Monthly churn = 25 ÷ 500 = 5%.
• Implied average customer lifetime = 1 ÷ 0.05 = 20 months.
• To grow at all, more than 25 new customers must be won every month.

Takeaway: At 5% monthly churn the business must replace 300 customers a year before growing. Halving churn to 2.5% doubles average lifetime and doubles LTV without winning a single extra customer.

Common mistakes

• Comparing your churn to benchmarks from a different segment — SMB and enterprise churn differ by an order of magnitude.
• Tracking only customer churn and missing that revenue is concentrated in a few accounts.
• Measuring churn too early, when a launch cohort has not yet had time to lapse.
• Treating churn as a retention-team problem when it usually originates in who you sold to.

Related tool: LTV calculator.

Related terms

• Customer Lifetime Value — Customer lifetime value (LTV) is the total gross profit you expect to earn from a single customer across the whole of their relationship with you, before the cost of acquiring them.
• Net Revenue Retention — Net revenue retention (NRR) measures how revenue from an existing cohort of customers changes over a year, including upgrades, downgrades and cancellations but excluding new customers. Above 100% means the cohort grows on its own.
• Cohort Analysis — Cohort analysis groups customers by when they joined and tracks each group's behaviour over time, revealing retention and revenue patterns that aggregate metrics hide.
• Product-Market Fit — Product-market fit is the point where a product satisfies a real, urgent demand well enough that customers adopt it, keep using it, and tell others — so growth starts pulling rather than being pushed.