Churn Revenue Impact Calculator
Customer churn is one of the most damaging forces in a subscription business. Every percentage point of monthly churn compounds into substantial revenue loss over time, eroding the base that new customer acquisition must constantly refill. This calculator quantifies exactly how much MRR is lost to churn each month, projects the 12-month cumulative revenue impact, and shows the dollar difference of reducing churn by 1 percentage point. Understanding this figure in concrete dollar terms makes the case for investing in customer success, onboarding improvements, and retention programs far more compelling than abstract percentages alone.
Churn revenue impact formula
Monthly MRR Lost = Current MRR * (Churn Rate / 100)
MRR(n) = MRR(n-1) * (1 - Churn/100) + New MRR
Churn Saving = MRR Lost at current rate - MRR Lost at (churn - 1%)
Churn impact over 12 months
- At 1% monthly churn with no new MRR: lose about 11% of the base annually.
- At 3% monthly churn: lose about 31% of the base annually.
- At 5% monthly churn: lose about 46% of the base annually.
- Adding new MRR helps, but cannot overcome high churn indefinitely.
Churn: frequently asked questions
What is revenue churn?
Revenue churn (MRR churn) is the percentage of monthly recurring revenue lost due to cancellations and downgrades in a given period. It is distinct from customer churn, which counts the number of customers lost.
What is a good monthly churn rate for SaaS?
Best-in-class SaaS companies target monthly revenue churn below 0.5 to 1 percent. SMB-focused SaaS commonly sees 2 to 5 percent monthly churn. Enterprise SaaS targets annual churn of 5 to 10 percent.
How does churn compound over time?
Churn compounds negatively. At 5 percent monthly churn, a company loses more than 45 percent of its MRR over 12 months without offsetting new revenue. Reducing churn by even 1 percent dramatically improves retention.
What is the difference between gross and net revenue churn?
Gross revenue churn measures only lost revenue from cancellations and downgrades. Net revenue churn subtracts expansion revenue from existing customers. Negative net churn means expansions exceed losses.
How do I reduce churn?
Improve onboarding to drive faster time-to-value, invest in customer success, add annual contract incentives, and identify at-risk accounts early using health scores and usage data.
Sources
- U.S. Securities and Exchange Commission: EDGAR Company Filings.
- U.S. Small Business Administration: Manage Your Finances.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.