Five steps to calculate customer and revenue churn accurately. Formulas, gross vs net churn, and actionable benchmarks for SaaS product managers.
Pick the right measurement window before you start. Monthly churn is the standard for SaaS because it gives you high-frequency signal and matches subscription billing cycles.
Formula
Measurement Period: Monthly (recommended) | Quarterly | AnnualPro tip: If you have both monthly and annual subscribers, calculate churn separately for each cohort before blending. A 5% monthly churn rate for monthly subscribers and 10% annual churn for annual subscribers represent very different retention situations and should be tracked independently.
Your starting customer count is the denominator. A common mistake is using a mid-period snapshot instead of the clean opening count.
Formula
Starting Customers = Active Paying Customers at Period StartPro tip: Export and archive your customer count at the start of each period in a spreadsheet or dashboard. Billing systems often make it difficult to query historical snapshots retroactively. A simple monthly log prevents having to reverse-engineer counts later.
Counting churned customers needs a clear taxonomy. Not every departure looks the same. Conflating categories produces misleading metrics.
Formula
Customers Lost = Voluntary Cancellations + Involuntary Churn + Non-RenewalsPro tip: Tag every churn event with a reason in your CRM. Even rough categorizations (price, competitor, product gap, lifecycle end) become invaluable over time. Six months of tagged churn data is enough to identify your top three churn drivers and build a targeted retention program.
With your starting count and churned customers defined, apply the core formula. This percentage tells you the rate at which your customer base is contracting before accounting for new customer additions.
Formula
Customer Churn Rate = (Customers Lost / Customers at Start) x 100%Pro tip: Calculate both gross churn (customers lost) and net churn (customers lost minus customers expanded or reactivated). If you are growing through account expansion, net negative churn (expansion revenue exceeds lost revenue) is the gold standard of SaaS retention.
Customer churn counts heads. Revenue churn counts dollars. These two metrics diverge when customers have different revenue profiles. Revenue churn is usually the more important business metric.
Formula
Revenue Churn Rate = (MRR Lost / MRR at Start) x 100%Pro tip: Track both customer churn and revenue churn side by side every month. When they diverge by more than 2-3 percentage points, investigate immediately. Divergence reveals which customer segments are most at risk and which are your most loyal.
Skip the manual math. Use our free churn rate calculator with built-in revenue churn analysis, NRR calculations, and customer lifetime projections.
Open Free Churn Rate CalculatorBest-in-class monthly churn (2024 SaaS benchmarks): SMB under 2%, mid-market under 1.5%, enterprise under 1% (roughly 12% annual). Consumer subscription products can tolerate slightly higher churn due to lower CAC and faster reacquisition. Always evaluate churn against your CAC and LTV. A 5% monthly churn rate is survivable if CAC is low and LTV is high enough.
Gross churn measures only the revenue or customers lost from cancellations, downgrades, and non-renewals. Net churn subtracts expansion revenue (upsells, cross-sells, seat additions) from the churned revenue. Net churn can be negative, meaning existing customers grow faster than you lose them. This is called net negative churn and is a hallmark of the strongest SaaS businesses. Track both: gross churn tells you about product stickiness, net churn tells you about your expansion motion.
Voluntary churn occurs when customers actively choose to cancel due to price, product gaps, poor fit, or competitive alternatives. Involuntary churn (also called delinquent churn) happens when customers are lost to failed payments, expired credit cards, or billing processing issues. Involuntary churn typically accounts for 20-40% of total churn in consumer SaaS. It is highly recoverable with dunning email sequences, smart payment retries, and proactive card update nudges. Reducing it does not require product changes.
Churn rate is the biggest lever in the LTV formula. LTV = (ARPU x Gross Margin) / Monthly Churn Rate. Because churn is in the denominator, even small improvements compound. Reducing monthly churn from 4% to 3% increases LTV by 33%. Reducing from 4% to 2% doubles LTV. This is why retention is often more capital-efficient than acquisition: a 1% churn reduction often has a larger LTV impact than a 15% ARPU increase.
Calculate both, every month. Customer churn tells you about retention breadth (are you losing many customers or few?). Revenue churn tells you about the financial impact (are the customers you lose high-value or low-value?). The most important downstream metric is Net Revenue Retention (NRR), which combines revenue churn and expansion. Top-quartile SaaS companies maintain NRR above 120%, meaning existing customers grow revenue faster than churn erodes it.