Resources / Glossary / Churn

Churn.

Aka. Customer churn · attrition · revenue churn
All terms

What is churn?

Churn is the rate at which a company loses customers, or the recurring revenue they represent, over a defined period. It is the leak in the bucket: a business can sign new customers every month and still shrink if existing ones leave faster. For any subscription or recurring-revenue business, churn is the single most important driver of how durable the revenue base actually is.

Churn is measured two ways, and confusing them is the most common error. Logo churn counts customers lost, regardless of their size. Revenue churn counts the dollars lost. A company can lose many small customers (high logo churn) while keeping most of its revenue (low revenue churn), or lose one large account and barely move logo churn while taking a serious revenue hit.

The deeper distinction is between gross and net churn. Gross churn counts only the revenue lost. Net churn subtracts expansion — upsells and price increases from retained customers — so a business where existing customers grow can post negative net churn, meaning the existing base expands even before any new sales.

How churn is calculated

The mechanics are straightforward; the discipline is in defining the period and the base consistently.

  1. Pick a period and a base. Take the customers or recurring revenue at the start of the period — typically a month, quarter, or year.
  2. Gross revenue churn. Revenue lost from cancellations and downgrades during the period, divided by the starting revenue. This ignores any growth in the retained base.
  3. Net revenue churn. Revenue lost minus expansion from retained customers, divided by starting revenue. If expansion exceeds losses, net churn is negative.
  4. Logo churn. Customers lost during the period divided by customers at the start — a count, not a dollar figure.

The complement of net revenue churn is net revenue retention. A business with 5% net churn retains 95% of its revenue from the existing base; a business at negative 8% net churn grows that base by 8% with no new logos at all.

Why churn is a value-creation lever, not just a metric

Churn compounds. A few points of difference in annual retention translate into a large difference in the lifetime value of a customer and in the steady-state size of the revenue base. That is why retention is often a higher-return lever than acquisition: keeping a customer is almost always cheaper than replacing them.

In a portfolio company, reducing churn means understanding why customers leave — price, product gaps, service, a competitor, or simply going out of business — and fixing the causes that are addressable. Voluntary churn (a customer choosing to leave) is a product and commercial problem; involuntary churn (failed payments, expired cards) is often an operational fix with surprisingly high payback.

Frequently asked.

6 questions
01 What's the difference between gross and net churn?

Gross churn counts only the recurring revenue lost from cancellations and downgrades. Net churn subtracts expansion — upsells and price increases from customers who stayed — from those losses.

Net churn can be negative, meaning the existing customer base grew even after accounting for losses. Gross churn can never be negative; it only measures the leak, not the offsetting growth.

02 What's the difference between logo churn and revenue churn?

Logo churn counts the number of customers lost; revenue churn counts the dollars lost. They diverge when customers differ in size.

A business that loses many tiny accounts but keeps its large ones has high logo churn and low revenue churn. One that loses a single major account has the reverse. Sophisticated readers always ask which one a churn figure refers to.

03 What is net revenue retention?

Net revenue retention (NRR) is the mirror image of net revenue churn: it measures how much recurring revenue from a cohort of existing customers remains after a period, including expansion and net of losses.

An NRR of 110% means the existing base grew 10% on its own; an NRR of 90% means it shrank 10%. NRR above 100% is equivalent to negative net churn.

04 Why does a small change in churn matter so much?

Because churn compounds over the life of every customer. A move from 90% to 95% annual retention roughly doubles the average time a customer stays, which sharply raises lifetime value and the steady-state size of the revenue base.

The effect is non-linear, which is why retention improvements often beat new-customer acquisition on return — the gains accrue on the entire base, every period.

05 What's the difference between voluntary and involuntary churn?

Voluntary churn is a customer actively choosing to leave — for price, a competitor, or an unmet need. Involuntary churn is losing a customer for mechanical reasons, most often a failed or expired payment.

The fixes differ. Voluntary churn requires product, pricing, and service work. Involuntary churn is often reduced cheaply through better billing — card-update prompts, retry logic, and dunning.

06 How is churn monitored across a hold period?

Churn is usually tracked by cohort and by reason code, reported in the KPI dashboard and reviewed in the monthly operating review against the value creation plan.

When the underlying customer and revenue data sits in one queryable place rather than reconstructed each board cycle, the trend — and the why behind it — stays legible from entry to exit rather than being re-derived for every diligence request.

See how churn stays measured by cohort
across the full holding period.

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