TL;DR
Churn is the rate at which customers cancel or stop generating recurring revenue. Logo churn measures lost customers; revenue churn measures lost ARR. Gross churn excludes expansion; net churn subtracts expansion and can be negative. Do not multiply monthly churn by 12 — use the compounding formula instead.
Definition
Churn is the counterweight to acquisition in any subscription business, and the rate at which a SaaS bucket leaks determines how fast the company can ever fill it. Churn matters because subscription economics are unforgiving. A customer acquired today generates revenue only as long as the customer stays. A 5 percent monthly churn rate means that half the customer base will leave within a year. The acquisition team has to refill that half before generating a single dollar of net growth.
Churn determines the maximum size the business can ever reach, the payback period on every dollar of customer acquisition cost, and the multiple the company trades at when it raises capital. The fix is mechanical: pick the right definition, calculate it the same way every month, and never mix categories in the same report.
The compounding math matters. A 5 percent monthly churn rate does not produce 60 percent annual churn. It produces 46 percent annual churn, calculated as 1 minus (1 minus 0.05) raised to the twelfth power. A team starting the year with 1,000 customers ends the year with 540 customers if churn stays at 5 percent monthly, even before new acquisition.
Logo churn vs revenue churn
Logo churn and revenue churn measure the same event — a customer leaving — but they answer different questions. Logo churn answers how many customers walked away. Revenue churn answers how much money walked away. The two figures can diverge sharply, and reading only one of them hides half the story.
Logo churn is the percentage of customers lost in a period, divided by the customer count at the start of the period. Revenue churn is the percentage of recurring revenue lost in a period, divided by the recurring revenue at the start of the period. If a company starts the month with 500 customers and 20 cancel, logo churn is 4 percent. If those 20 customers represented above-average ACV, revenue churn could read 6 percent — signaling that retention is breaking where it costs the most.
The rule operators converge on: report logo churn for the headline narrative, report revenue churn for the operating decision, and never combine the two into a single average. Each tells a different story, and averaging them produces a number that means nothing.
Gross churn vs net churn
Gross churn is total lost ARR divided by starting ARR, with no offset for expansion. If a company starts a quarter with 6 million dollars in ARR and loses 360,000 dollars from cancellations and contractions, gross churn is 6 percent. The metric measures only the leak. It is the right figure for diagnosing retention problems because it isolates the loss signal from the growth signal.
Net churn is gross churn minus expansion ARR, divided by starting ARR. If the same company also added 720,000 dollars in expansion from existing customers, net churn is (360,000 minus 720,000) divided by 6,000,000, or negative 6 percent. A negative net churn rate means the existing customer base grew despite the cancellations — the company has Net Revenue Retention above 100 percent.
Always state which figure is being shown. A team that reports only net churn hides the leak behind expansion revenue. A team that reports only gross churn understates the resilience of the base. Both figures belong on the board pack.
Why churn matters
In a subscription business, churn matters more than acquisition because the bucket cannot fill faster than it drains. A team with elevated churn is running an acquisition treadmill that grows the burn rate without compounding the base. Churn also caps the maximum size the business can ever reach. The steady-state customer count of a subscription business equals new customers per month divided by monthly churn rate. A team adding 50 new customers per month at 5 percent monthly churn caps out at 1,000 customers. The same team at 1 percent churn caps out at 5,000. Acquisition velocity sets the slope; churn sets the ceiling.
The fastest churn reductions come from fixing onboarding (the first 30 days drive the majority of first-year churn), implementing a dunning workflow for failed payments, and identifying at-risk accounts through usage signals before renewal. Harvard Business Review research on subscription businesses reports that customers who reach their activation milestone within the first 30 days churn at one-third the rate of customers who do not.
See it in the product
Churn signals — inside a real Gangly workflow.
Gangly flags at-risk accounts from usage signals 60 days before renewal so reps can act before the cancellation arrives.
Frequently asked questions
What does churn mean in SaaS?
Churn is the rate at which customers cancel a subscription or stop generating recurring revenue in a given period. It is reported either as logo churn (percentage of customers lost) or revenue churn (percentage of recurring revenue lost). Churn is the most important counterweight to acquisition in a subscription business.
What is a good monthly churn rate?
Bessemer Venture Partners benchmarks for 2026 suggest 3 to 5 percent monthly logo churn is typical for SMB SaaS, 1 to 2 percent for mid-market, and 0.5 to 1.0 percent for enterprise. Best-in-class companies report net negative churn, meaning expansion revenue exceeds gross churn and Net Revenue Retention is above 100 percent.
What is the difference between gross churn and net churn?
Gross churn is total lost ARR divided by starting ARR and does not count expansion revenue. Net churn is gross churn minus expansion ARR, divided by starting ARR. Net churn can be negative when expansion exceeds churn, which is the hallmark of best-in-class SaaS businesses.
How do I convert monthly churn to annual churn?
Do not multiply monthly churn by 12. That overstates the figure because churn compounds. The correct formula is 1 minus (1 minus monthly churn) raised to the twelfth power. At 5 percent monthly churn, annual churn is 46 percent, not 60 percent. Compounding matters because every month the base shrinks.
What is involuntary churn?
Involuntary churn is revenue lost from failed payments, expired credit cards, or billing errors rather than deliberate cancellations. It often accounts for 20 to 40 percent of total churn in SMB SaaS and is the most recoverable category. A dunning workflow that retries failed payments recovers most involuntary churn within two weeks.
What is the best way to reduce churn?
The fastest reductions come from fixing onboarding (the first 30 days drive 60 percent of first-year churn), implementing a dunning workflow for failed payments, and identifying at-risk accounts through usage signals before renewal. Long-term churn reduction requires aligning the product roadmap to retention drivers, not only acquisition drivers.