Churn impact calculator
See exactly how a change in monthly churn rate compounds into lost or recovered revenue over time — using your real MRR and customer lifetime value.
Enter your current monthly recurring revenue, your current monthly churn rate, and a target churn rate. The calculator projects both scenarios forward across your chosen time horizon and shows the dollar difference at the end.
Churn impact calculator inputs and results
How this calculator works
Each month, your MRR shrinks by your churn rate before any new revenue is added. This calculator runs that shrinkage forward, once at your current churn rate and once at your target rate, with no new growth assumed in either scenario. The gap between the two lines at the end of your time horizon is the revenue your churn rate is costing you, or the revenue a lower churn rate would protect.
Small differences in churn compound quickly. A move from 3% to 2% monthly churn doesn't sound large, but over 12 months it changes how much of your starting MRR survives by a wide margin, since the reduction applies every single month, not once.
About this tool
This tool is a free calculator. Inputs: current MRR, average customer LTV, current monthly churn rate %, projected/new monthly churn rate %, time horizon in months. Output: projected MRR at the end of the horizon under both churn rates, and the total dollar difference between them. Formula basis: compounding monthly churn against a growing or flat customer base.
Frequently asked questions
How is churn rate impact on revenue calculated?
MRR is projected forward month by month, reducing the customer base by the churn rate each period. Two projections run side by side, one at your current churn rate and one at your target, and the calculator reports the dollar gap between them at the end of your chosen time horizon.
What's a good monthly churn rate for SaaS?
Most benchmarks put healthy monthly churn for small and mid-sized B2B SaaS companies between 1% and 2%, roughly 10–20% annually. Consumer and low-price-point products typically run higher than that.
Does this account for new customers added during the period?
No — this tool isolates the effect of churn on your existing base. Use the MRR growth projector if you want to combine churn with new customer growth.