Financial Glossary
Churn
Churn is the rate at which customers cancel, lapse, or stop purchasing within a defined period, typically expressed as a percentage of the starting customer base. Customer churn rate = customers lost during period divided by customers at start of period, times 100. Revenue churn (also called MRR churn) measures the percentage of recurring revenue lost, which can differ from customer churn when high-value accounts leave disproportionately. Gross churn counts only losses; net churn subtracts expansion revenue from existing customers, so a business with strong upsell can have negative net churn even while losing some customers.
Problem & Application
A SaaS campground management platform starts a quarter with 400 active subscribers at $200 per month each ($80,000 MRR). During the quarter 20 cancel. Customer churn rate = 20 divided by 400 = 5% for the quarter, or roughly 20% annualized -- a level that would require replacing one-fifth of the customer base each year just to stay flat. If those churned accounts averaged $250 per month while 15 existing accounts upgraded from $200 to $300, gross MRR churn is $5,000 but net MRR churn is $5,000 minus $1,500 expansion = $3,500. Reducing churn by even 2 percentage points annually compresses the customer acquisition treadmill significantly. Cohort analysis, exit surveys, and product-usage signals are standard tools for diagnosing root causes.
In Short
Reducing churn is essential for long-term business growth. Companies should implement retention strategies, personalize customer experiences, and continuously improve their offerings.
How it works
Churn is most useful as a trend, not a single snapshot: you track it month over month and segment it by cohort, plan tier, or customer type to see where retention actually breaks down. The standard formula is customers (or revenue) lost during a period divided by the count at the start of that period, but the period length matters enormously, because a clean-looking 2% monthly churn compounds to roughly 22% annually. A common misunderstanding is treating churn and retention as exact mirror images; they are related but not interchangeable once expansion revenue, downgrades, and reactivations enter the picture, which is why net revenue churn can diverge sharply from raw customer churn.
Worked example: seasonal churn at an RV park software vendor
Consider a vendor selling booking software to RV parks. It enters January with 250 customers paying $180/month ($45,000 MRR). Many parks are seasonal, so over the off-season quarter, 25 cancel. Customer churn rate = 25 / 250 = 10% for the quarter. The lost accounts averaged $200/month, so gross MRR churn = $5,000 (about 11% of MRR, higher than the customer rate because larger parks left). Meanwhile, 30 surviving parks upgraded from $180 to $240, adding $1,800 in expansion MRR. Net MRR churn = $5,000 - $1,800 = $3,200, or roughly 7%. The lesson for an STR or hospitality SMB: a single headline churn number hides the story. Splitting customer churn from revenue churn, and gross from net, shows whether you are losing many small accounts, a few large ones, or offsetting losses with upsell.
Frequently asked
What is a good churn rate for a small business?
It depends on the model. For B2B SaaS and subscription SMBs, monthly customer churn around 1-2% (roughly 12-22% annually) is generally considered healthy, while consumer or seasonal businesses often run higher. There is no universal benchmark; compare against your own cohorts over time and your industry rather than a fixed target.
How do you calculate annual churn from monthly churn?
You compound it rather than multiplying by 12. Annual retention equals the monthly retention rate raised to the 12th power, so annual churn = 1 minus that. For example, 2% monthly churn means 98% monthly retention; 0.98 to the 12th power is about 0.785, giving roughly 21.5% annual churn, not 24%.
What is the difference between gross churn and net churn?
Gross churn counts only revenue or customers lost from cancellations and downgrades, so it can never be negative. Net churn subtracts expansion revenue (upsells and upgrades from existing customers) from those losses. A business with strong upsell can post negative net churn, meaning its existing customer base grows revenue even as some accounts leave.